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RHSA-2026:68504

Vulnerability from csaf_redhat - Published: 2026-09-17 05:05 - Updated: 2026-09-17 08:40
Summary
Red Hat Security Advisory: osbuild-composer security update
Severity
Important
Notes
Topic: An update for osbuild-composer is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild under the hood. Besides building images for local usage, it can also upload images directly to cloud. It is compatible with composer-cli and cockpit-composer clients. Security Fix(es): * golang-fips: Golang FIPS zeroed buffer (CVE-2024-9355) * golang: net/http: net/http: sensitive headers incorrectly sent after cross-domain redirect (CVE-2024-45336) * crypto/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec (CVE-2025-22866) * crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption (CVE-2025-68121) * crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281) * crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810) * golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282) * crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283) * crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280) * net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499) * net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820) * golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821) * mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504) * encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818) * net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860) * net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853) * html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858) * crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862) * encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

A vulnerability was found in Golang FIPS OpenSSL. This flaw allows a malicious user to randomly cause an uninitialized buffer length variable with a zeroed buffer to be returned in FIPS mode. It may also be possible to force a false positive match between non-equal hashes when comparing a trusted computed hmac sum to an untrusted input sum if an attacker can send a zeroed buffer in place of a pre-computed sum.  It is also possible to force a derived key to be all zeros instead of an unpredictable value.  This may have follow-on implications for the Go TLS stack.

CWE-457 - Use of Uninitialized Variable
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-0:75-10.el8_8.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-0:75-10.el8_8.src
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-core-0:75-10.el8_8.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-core-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-core-debuginfo-0:75-10.el8_8.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-core-debuginfo-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-debuginfo-0:75-10.el8_8.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-debuginfo-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-debugsource-0:75-10.el8_8.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-debugsource-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-dnf-json-0:75-10.el8_8.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-dnf-json-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-tests-debuginfo-0:75-10.el8_8.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-tests-debuginfo-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-worker-0:75-10.el8_8.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-worker-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-worker-debuginfo-0:75-10.el8_8.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-worker-debuginfo-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-0:75-10.el8_8.src
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-core-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-core-debuginfo-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-debuginfo-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-debugsource-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-dnf-json-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-tests-debuginfo-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-worker-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-worker-debuginfo-0:75-10.el8_8.x86_64
Vendor Fix fix
Workaround
Threats
Impact Moderate

A flaw was found in the net/http package of the Golang standard library. The HTTP client drops sensitive headers after following a cross-domain redirect. For example, a request to `a.com/` containing an Authorization header redirected to `b.com/` will not send that header to `b.com`. However, the sensitive headers would be restored if the client received a subsequent same-domain redirect. For example, a chain of redirects from `a.com/`, to `b.com/1`, and finally to `b.com/2` would incorrectly send the Authorization header to `b.com/2`.

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Moderate

A flaw was found in the Golang crypto/internal/nistec package. Due to the usage of a variable time instruction in the assembly implementation of an internal function, a small number of bits of secret scalars are leaked on the ppc64le architecture. Considering how this function is used, this leakage is likely insufficient to recover the private key when P-256 is used in any well-known protocols.

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Moderate

A flaw was found in the crypto/tls component. This vulnerability occurs during Transport Layer Security (TLS) session resumption when certificate authority (CA) settings are modified between the initial and resumed handshakes. An attacker could exploit this to bypass certificate validation, allowing a client or server to establish a connection that should have been rejected. This could lead to an authentication bypass under specific conditions.

Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Moderate

A flaw was found in the Go standard library packages `crypto/x509` and `crypto/tls`. During the process of building a certificate chain, an attacker can provide a large number of intermediate certificates. This excessive input is not properly limited, leading to an uncontrolled amount of work being performed. This can result in a denial of service (DoS) condition, making the affected system or application unavailable to legitimate users.

CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in Go's `crypto/x509` package. A remote attacker could exploit this by presenting a specially crafted certificate chain containing a large number of policy mappings. This inefficient validation process consumes excessive resources, which can lead to a denial of service (DoS) for applications or systems performing certificate validation.

CWE-1050 - Excessive Platform Resource Consumption within a Loop
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Moderate

A flaw was found in the internal/syscall/unix package in the Go standard library. If the target of the `Root.Chmod` function is replaced with a symbolic link during execution, specifically after `Root.Chmod` checks the target but before acting, the `chmod` operation will be performed on the file the symbolic link points to. This issue can bypass directory restrictions and lead to unauthorized permission changes on the filesystem.

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Moderate

A flaw was found in the `crypto/tls` package within the Go (golang) standard library, specifically affecting TLS 1.3 connections. A remote attacker can exploit this vulnerability by sending multiple key update messages in a single record after the handshake. This can cause the connection to deadlock, leading to uncontrolled consumption of resources and ultimately a denial of service (DoS).

CWE-764 - Multiple Locks of a Critical Resource
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in the `crypto/x509` package within Go (golang). When verifying a certificate chain, excluded DNS (Domain Name System) constraints are not correctly applied to wildcard DNS Subject Alternative Names (SANs) if the case of the SAN differs from the constraint. This oversight could allow an attacker to bypass certificate validation, potentially leading to the acceptance of a malicious certificate that should have been rejected. This issue specifically impacts the validation of trusted certificate chains.

CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in the `encoding/asn1` package in Go. An attacker could provide a specially crafted, deeply-nested Abstract Syntax Notation One (ASN.1) structure, leading to excessive recursion during the `Unmarshal` operation. This could result in stack exhaustion and a Denial of Service (DoS) condition.

CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in the `net/mail` package of the Go programming language. An attacker could provide specially crafted inputs to the `ParseAddress`, `ParseAddressList`, or `ParseDate` functions. This could lead to excessive consumption of CPU and memory resources, resulting in a Denial of Service (DoS) for applications processing these inputs.

CWE-606 - Unchecked Input for Loop Condition
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.

CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in the `net/mail` package within the Go standard library. A remote attacker could provide specially crafted, pathological email addresses. When these malformed email addresses are parsed by the `consumePhrase` function, it can lead to excessive resource consumption due to quadratic string concatenation, resulting in a Denial of Service (DoS) condition.

CWE-1046 - Creation of Immutable Text Using String Concatenation
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in the Golang MIME (Multipurpose Internet Mail Extensions) package. A remote attacker could exploit this vulnerability by sending a maliciously-crafted MIME header containing many invalid encoded-words. This could lead to excessive CPU consumption, resulting in a Denial of Service (DoS) for the affected system.

CWE-1050 - Excessive Platform Resource Consumption within a Loop
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in the `net/http` component of the Go standard library. When a server is configured to support unencrypted HTTP/2, it reads initial bytes from new connections to detect the HTTP/2 client preface. However, the `ReadHeaderTimeout` is not correctly applied during this process. This oversight could allow a remote attacker to maintain open connections indefinitely, potentially leading to a Denial of Service (DoS) by exhausting server resources.

CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in the `html/template` component of Go (golang). Pathological inputs could prematurely close an unescaped forward slash ('/'), allowing an attacker to inject arbitrary content. This could lead to Cross-Site Scripting (XSS), where malicious scripts are executed in a user's browser, potentially compromising user data or actions.

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in the `encoding/xml` package of Go. The `DecodeElement` function failed to correctly track recursion depth, which could lead to stack exhaustion. A remote attacker could exploit this vulnerability by providing a specially crafted XML input, resulting in a Denial of Service (DoS) for the affected application.

CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in `net/url`, a component of `golang`. This vulnerability arises when resolving relative paths that contain numerous parent directory ('..') segments. A remote attacker could exploit this by providing a specially crafted path, leading to quadratic time complexity and excessive memory allocation. This can result in a Denial of Service (DoS) due to resource exhaustion.

CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important

A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.

CWE-1050 - Excessive Platform Resource Consumption within a Loop
Affected products
Fixed 29 products, the same list as for CVE-2024-9355
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:68504 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2315719 external
https://bugzilla.redhat.com/show_bug.cgi?id=2341751 external
https://bugzilla.redhat.com/show_bug.cgi?id=2344219 external
https://bugzilla.redhat.com/show_bug.cgi?id=2437111 external
https://bugzilla.redhat.com/show_bug.cgi?id=2456333 external
https://bugzilla.redhat.com/show_bug.cgi?id=2456335 external
https://bugzilla.redhat.com/show_bug.cgi?id=2456336 external
https://bugzilla.redhat.com/show_bug.cgi?id=2456338 external
https://bugzilla.redhat.com/show_bug.cgi?id=2456339 external
https://bugzilla.redhat.com/show_bug.cgi?id=2467809 external
https://bugzilla.redhat.com/show_bug.cgi?id=2467820 external
https://bugzilla.redhat.com/show_bug.cgi?id=2480756 external
https://bugzilla.redhat.com/show_bug.cgi?id=2484204 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515815 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515820 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515827 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515838 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515839 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515840 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2024-9355 self
https://bugzilla.redhat.com/show_bug.cgi?id=2315719 external
https://www.cve.org/CVERecord?id=CVE-2024-9355 external
https://nvd.nist.gov/vuln/detail/CVE-2024-9355 external
https://github.com/golang-fips/openssl/pull/198 external
https://access.redhat.com/security/cve/CVE-2024-45336 self
https://bugzilla.redhat.com/show_bug.cgi?id=2341751 external
https://www.cve.org/CVERecord?id=CVE-2024-45336 external
https://nvd.nist.gov/vuln/detail/CVE-2024-45336 external
https://github.com/golang/go/issues/70530 external
https://groups.google.com/g/golang-announce/c/sSa… external
https://access.redhat.com/security/cve/CVE-2025-22866 self
https://bugzilla.redhat.com/show_bug.cgi?id=2344219 external
https://www.cve.org/CVERecord?id=CVE-2025-22866 external
https://nvd.nist.gov/vuln/detail/CVE-2025-22866 external
https://go.dev/cl/643735 external
https://go.dev/issue/71383 external
https://groups.google.com/g/golang-announce/c/xU1… external
https://pkg.go.dev/vuln/GO-2025-3447 external
https://access.redhat.com/security/cve/CVE-2025-68121 self
https://bugzilla.redhat.com/show_bug.cgi?id=2437111 external
https://www.cve.org/CVERecord?id=CVE-2025-68121 external
https://nvd.nist.gov/vuln/detail/CVE-2025-68121 external
https://go.dev/cl/737700 external
https://go.dev/issue/77217 external
https://groups.google.com/g/golang-announce/c/K09… external
https://pkg.go.dev/vuln/GO-2026-4337 external
https://access.redhat.com/security/cve/CVE-2026-32280 self
https://bugzilla.redhat.com/show_bug.cgi?id=2456339 external
https://www.cve.org/CVERecord?id=CVE-2026-32280 external
https://nvd.nist.gov/vuln/detail/CVE-2026-32280 external
https://go.dev/cl/758320 external
https://go.dev/issue/78282 external
https://groups.google.com/g/golang-announce/c/0uY… external
https://pkg.go.dev/vuln/GO-2026-4947 external
https://access.redhat.com/security/cve/CVE-2026-32281 self
https://bugzilla.redhat.com/show_bug.cgi?id=2456333 external
https://www.cve.org/CVERecord?id=CVE-2026-32281 external
https://nvd.nist.gov/vuln/detail/CVE-2026-32281 external
https://go.dev/cl/758061 external
https://go.dev/issue/78281 external
https://pkg.go.dev/vuln/GO-2026-4946 external
https://access.redhat.com/security/cve/CVE-2026-32282 self
https://bugzilla.redhat.com/show_bug.cgi?id=2456336 external
https://www.cve.org/CVERecord?id=CVE-2026-32282 external
https://nvd.nist.gov/vuln/detail/CVE-2026-32282 external
https://go.dev/cl/763761 external
https://go.dev/issue/78293 external
https://pkg.go.dev/vuln/GO-2026-4864 external
https://access.redhat.com/security/cve/CVE-2026-32283 self
https://bugzilla.redhat.com/show_bug.cgi?id=2456338 external
https://www.cve.org/CVERecord?id=CVE-2026-32283 external
https://nvd.nist.gov/vuln/detail/CVE-2026-32283 external
https://go.dev/cl/763767 external
https://go.dev/issue/78334 external
https://pkg.go.dev/vuln/GO-2026-4870 external
https://access.redhat.com/security/cve/CVE-2026-33810 self
https://bugzilla.redhat.com/show_bug.cgi?id=2456335 external
https://www.cve.org/CVERecord?id=CVE-2026-33810 external
https://nvd.nist.gov/vuln/detail/CVE-2026-33810 external
https://go.dev/cl/763763 external
https://go.dev/issue/78332 external
https://pkg.go.dev/vuln/GO-2026-4866 external
https://access.redhat.com/security/cve/CVE-2026-33818 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515815 external
https://www.cve.org/CVERecord?id=CVE-2026-33818 external
https://nvd.nist.gov/vuln/detail/CVE-2026-33818 external
https://go.dev/cl/814980 external
https://go.dev/issue/80405 external
https://groups.google.com/g/golang-announce/c/94p… external
https://pkg.go.dev/vuln/GO-2026-5972 external
https://access.redhat.com/security/cve/CVE-2026-39820 self
https://bugzilla.redhat.com/show_bug.cgi?id=2467820 external
https://www.cve.org/CVERecord?id=CVE-2026-39820 external
https://nvd.nist.gov/vuln/detail/CVE-2026-39820 external
https://go.dev/cl/759940 external
https://go.dev/issue/78566 external
https://groups.google.com/g/golang-announce/c/qcC… external
https://pkg.go.dev/vuln/GO-2026-4986 external
https://access.redhat.com/security/cve/CVE-2026-39821 self
https://bugzilla.redhat.com/show_bug.cgi?id=2480756 external
https://www.cve.org/CVERecord?id=CVE-2026-39821 external
https://nvd.nist.gov/vuln/detail/CVE-2026-39821 external
https://go.dev/cl/767220 external
https://go.dev/issue/78760 external
https://groups.google.com/g/golang-announce/c/iI-… external
https://pkg.go.dev/vuln/GO-2026-5026 external
https://access.redhat.com/security/cve/CVE-2026-42499 self
https://bugzilla.redhat.com/show_bug.cgi?id=2467809 external
https://www.cve.org/CVERecord?id=CVE-2026-42499 external
https://nvd.nist.gov/vuln/detail/CVE-2026-42499 external
https://go.dev/cl/771520 external
https://go.dev/issue/78987 external
https://pkg.go.dev/vuln/GO-2026-4977 external
https://access.redhat.com/security/cve/CVE-2026-42504 self
https://bugzilla.redhat.com/show_bug.cgi?id=2484204 external
https://www.cve.org/CVERecord?id=CVE-2026-42504 external
https://nvd.nist.gov/vuln/detail/CVE-2026-42504 external
https://go.dev/cl/774481 external
https://go.dev/issue/79217 external
https://groups.google.com/g/golang-announce/c/tKs… external
https://pkg.go.dev/vuln/GO-2026-5038 external
https://access.redhat.com/security/cve/CVE-2026-56853 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515827 external
https://www.cve.org/CVERecord?id=CVE-2026-56853 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56853 external
https://go.dev/cl/795540 external
https://go.dev/issue/80205 external
https://pkg.go.dev/vuln/GO-2026-6089 external
https://access.redhat.com/security/cve/CVE-2026-56858 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515838 external
https://www.cve.org/CVERecord?id=CVE-2026-56858 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56858 external
https://go.dev/cl/807100 external
https://go.dev/issue/80435 external
https://pkg.go.dev/vuln/GO-2026-6091 external
https://access.redhat.com/security/cve/CVE-2026-56859 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515840 external
https://www.cve.org/CVERecord?id=CVE-2026-56859 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56859 external
https://go.dev/cl/803320 external
https://go.dev/issue/80481 external
https://pkg.go.dev/vuln/GO-2026-6088 external
https://access.redhat.com/security/cve/CVE-2026-56860 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515820 external
https://www.cve.org/CVERecord?id=CVE-2026-56860 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56860 external
https://go.dev/cl/803681 external
https://go.dev/issue/80494 external
https://pkg.go.dev/vuln/GO-2026-6218 external
https://access.redhat.com/security/cve/CVE-2026-56862 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515839 external
https://www.cve.org/CVERecord?id=CVE-2026-56862 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56862 external
https://go.dev/cl/804261 external
https://go.dev/issue/80528 external
https://pkg.go.dev/vuln/GO-2026-6090 external

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        "category": "summary",
        "text": "An update for osbuild-composer is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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        "text": "A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild under the hood. Besides building images for local usage, it can also upload images directly to cloud.  It is compatible with composer-cli and cockpit-composer clients.\n\nSecurity Fix(es):\n\n* golang-fips: Golang FIPS zeroed buffer (CVE-2024-9355)\n\n* golang: net/http: net/http: sensitive headers incorrectly sent after cross-domain redirect (CVE-2024-45336)\n\n* crypto/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec (CVE-2025-22866)\n\n* crypto/tls: crypto/tls: Incorrect certificate validation during TLS session resumption (CVE-2025-68121)\n\n* crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281)\n\n* crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810)\n\n* golang: internal/syscall/unix: Root.Chmod can follow symlinks out of the root (CVE-2026-32282)\n\n* crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283)\n\n* crypto/x509: crypto/tls: golang: Go: Denial of Service vulnerability in certificate chain building (CVE-2026-32280)\n\n* net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)\n\n* net/mail: golang: Go net/mail: Denial of Service via crafted email inputs (CVE-2026-39820)\n\n* golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)\n\n* mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)\n\n* encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)\n\n* net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)\n\n* net/http: golang: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)\n\n* html/template: golang: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)\n\n* crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)\n\n* encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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          "text": "This issue is specific to the Go language and only affects the test code in cri-o and conmon, not the production code. Since both projects use Go exclusively for testing purposes, this issue does not impact their production environment. Therefore, cri-o and conmon are not affected by this vulnerability.",
          "title": "Statement"
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          "title": "Vulnerability summary"
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          "text": "This is an Important denial of service vulnerability in the Go standard library\u0027s certificate chain building process. Systems utilizing Go applications that process untrusted TLS certificates or X.509 certificate chains are susceptible to resource exhaustion when presented with an excessive number of intermediate certificates, potentially leading to service unavailability. This flaw impacts applications directly using `crypto/x509` or `crypto/tls`.",
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          "title": "Vulnerability description"
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          "title": "Vulnerability summary"
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        {
          "category": "other",
          "text": "Important: A flaw in the Go `crypto/tls` package allows a remote attacker to cause a denial of service in applications using TLS 1.3. By sending multiple key update messages in a single record post-handshake, an attacker can trigger a connection deadlock, leading to uncontrolled resource consumption. This impacts Red Hat products utilizing the affected Go standard library for TLS 1.3 connections.",
          "title": "Statement"
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "title": "Vulnerability description"
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          "text": "crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application",
          "title": "Vulnerability summary"
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          "text": "This is an Important flaw in the Go `crypto/x509` package that could allow an attacker to bypass certificate validation. The vulnerability arises from an incorrect application of excluded DNS constraints to wildcard DNS Subject Alternative Names (SANs) when their case differs from the constraint. This could lead to Red Hat products accepting malicious certificates from otherwise trusted chains, compromising the trust model.",
          "title": "Statement"
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          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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          "title": "Vulnerability summary"
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          "text": "2515839"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important denial of service vulnerability in the `golang` `crypto/tls` package. A remote, unauthenticated attacker can exploit this flaw by continuously sending `KeyUpdate` messages during a TLS handshake, forcing the server to perform indefinite key derivation operations. This resource exhaustion can lead to a denial of service for applications and services in Red Hat products that use the affected `crypto/tls` library and are exposed to untrusted network clients.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-56862"
        },
        {
          "category": "external",
          "summary": "RHBZ#2515839",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515839"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-56862",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56862"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/804261",
          "url": "https://go.dev/cl/804261"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/80528",
          "url": "https://go.dev/issue/80528"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/94pEornpRlI",
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-6090",
          "url": "https://pkg.go.dev/vuln/GO-2026-6090"
        }
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      "release_date": "2026-08-13T21:58:53.216000+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-09-17T05:05:32+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
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      ],
      "title": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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