RHSA-2026:68504
Vulnerability from csaf_redhat - Published: 2026-09-17 05:05 - Updated: 2026-09-17 08:40A 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.
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-0:75-10.el8_8.ppc64le | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-0:75-10.el8_8.src | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-core-0:75-10.el8_8.ppc64le | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-core-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-core-debuginfo-0:75-10.el8_8.ppc64le | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-core-debuginfo-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-debuginfo-0:75-10.el8_8.ppc64le | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-debuginfo-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-debugsource-0:75-10.el8_8.ppc64le | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-debugsource-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-dnf-json-0:75-10.el8_8.ppc64le | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-dnf-json-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-tests-debuginfo-0:75-10.el8_8.ppc64le | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-tests-debuginfo-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-worker-0:75-10.el8_8.ppc64le | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-worker-debuginfo-0:75-10.el8_8.ppc64le | — |
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| Unresolved product id: AppStream-8.8.0.Z.E4S:osbuild-composer-worker-debuginfo-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-0:75-10.el8_8.src | — |
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| Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-core-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-dnf-json-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-tests-debuginfo-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-worker-0:75-10.el8_8.x86_64 | — |
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| Unresolved product id: AppStream-8.8.0.Z.TUS:osbuild-composer-worker-debuginfo-0:75-10.el8_8.x86_64 | — |
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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`.
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.
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.
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.
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.
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.
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).
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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"category": "description",
"text": "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.\u00a0 It is also possible to force a derived key to be all zeros instead of an unpredictable value.\u00a0 This may have follow-on implications for the Go TLS stack.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "golang-fips: Golang FIPS zeroed buffer",
"title": "Vulnerability summary"
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{
"category": "other",
"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"
},
{
"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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{
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{
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"text": "A flaw was found in Go\u0027s `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.",
"title": "Vulnerability description"
},
{
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"text": "crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw occurs during the validation of otherwise trusted certificate chains that contain a large number of policy mappings, leading to excessive resource consumption. Exploitation requires an attacker to present a specially crafted, yet trusted, certificate chain which would require the attacker has already compromised a trusted certificate root. Red Hat continuously monitors certificate authorities and curates the set which is trusted by default for Red Hat products.",
"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.",
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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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{
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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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{
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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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{
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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": "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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{
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"title": "Vulnerability description"
},
{
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"text": "mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is rated as an Important severity flaw. A remote attacker could trigger a Denial of Service by sending a crafted MIME header with numerous invalid encoded-words to an application utilizing the affected Golang MIME package. This could lead to excessive CPU consumption on the system processing the malformed header, impacting service availability.",
"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.",
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"references": [
{
"category": "self",
"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"
},
{
"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"
}
],
"release_date": "2026-08-13T21:58:53.216000+00:00",
"remediations": [
{
"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"
}
],
"title": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages"
}
]
}
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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.