RHSA-2026:70640
Vulnerability from csaf_redhat - Published: 2026-09-24 03:18 - Updated: 2026-09-24 09:56Summary
Red Hat Security Advisory: buildah security update
Severity
Important
Notes
Topic: An update for buildah is now available for Red Hat Enterprise Linux 9.
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: The buildah package provides a tool for facilitating building OCI container images. Among other things, buildah enables you to: Create a working container, either from scratch or using an image as a starting point; Create an image, either from a working container or using the instructions in a Dockerfile; Build both Docker and OCI images.
Security Fix(es):
* buildah: Go net/http: Unencrypted HTTP/2 connections vulnerable to Denial of Service (CVE-2026-56853)
* buildah: Go html/template: Cross-Site Scripting via pathological input (CVE-2026-56858)
* buildah: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)
* buildah: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)
* buildah: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)
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 flaw was found in Podman. If an attacker can pass a crafted tar archive to the `podman load` command, they can create files on the host machine with the privileges of the user running Podman.
5.5 (Medium)
Affected products
Fixed
21 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-2:1.43.3-2.el9_8.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-2:1.43.3-2.el9_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-2:1.43.3-2.el9_8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-2:1.43.3-2.el9_8.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-2:1.43.3-2.el9_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-debuginfo-2:1.43.3-2.el9_8.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-debuginfo-2:1.43.3-2.el9_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-debuginfo-2:1.43.3-2.el9_8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-debuginfo-2:1.43.3-2.el9_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-debugsource-2:1.43.3-2.el9_8.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-debugsource-2:1.43.3-2.el9_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-debugsource-2:1.43.3-2.el9_8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-debugsource-2:1.43.3-2.el9_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-tests-2:1.43.3-2.el9_8.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-tests-2:1.43.3-2.el9_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-tests-2:1.43.3-2.el9_8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-tests-2:1.43.3-2.el9_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-tests-debuginfo-2:1.43.3-2.el9_8.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-tests-debuginfo-2:1.43.3-2.el9_8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-tests-debuginfo-2:1.43.3-2.el9_8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.8.0.Z.MAIN.EUS:buildah-tests-debuginfo-2:1.43.3-2.el9_8.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in BuildKit. A custom client with valid permissions to access the BuildKit control API can produce an upload request that allows files to escape from the BuildKit-controlled state directory. This could lead to unauthorized modification or disclosure of sensitive data.
6.5 (Medium)
Affected products
Fixed
21 products, the same list as for
CVE-2025-11395
Threats
Impact
Moderate
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.
7.5 (High)
Affected products
Fixed
21 products, the same list as for
CVE-2025-11395
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.
7.5 (High)
Affected products
Fixed
21 products, the same list as for
CVE-2025-11395
Threats
Impact
Important
A flaw was found in golang.org/x/crypto/ssh. After a channel has been established, a remote malicious peer could send specially crafted messages. This could lead to a deadlock of the entire connection, resulting in a Denial of Service (DoS) for the affected system.
5.3 (Medium)
Affected products
Fixed
21 products, the same list as for
CVE-2025-11395
Threats
Impact
Moderate
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.
8.1 (High)
Affected products
Fixed
21 products, the same list as for
CVE-2025-11395
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.
7.5 (High)
Affected products
Fixed
21 products, the same list as for
CVE-2025-11395
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.
7.5 (High)
Affected products
Fixed
21 products, the same list as for
CVE-2025-11395
Threats
Impact
Important
References
61 references
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"title": "net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution"
},
{
"cve": "CVE-2026-56862",
"cwe": {
"id": "CWE-1050",
"name": "Excessive Platform Resource Consumption within a Loop"
},
"discovery_date": "2026-08-13T22:16:41.928450+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"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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}
]
}
Loading…
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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.
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.
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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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