Vulnerability-Lookup

RHSA-2026:87420

Vulnerability from csaf_redhat - Published: 2026-10-21 22:13 - Updated: 2026-10-27 10:31

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: brotli: * brotli-1.2.1-0.1.hum1 (aarch64, s390x, x86_64) * brotli-devel-1.2.1-0.1.hum1 (aarch64, s390x, x86_64) * libbrotli-1.2.1-0.1.hum1 (aarch64, s390x, x86_64) * python3-brotli-1.2.1-0.1.hum1 (aarch64, s390x, x86_64) * brotli-1.2.1-0.1.hum1.src (src)

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.

CVE-2026-111497

A flaw was found in the Google Brotli decoder. An out-of-bounds write in the block-type switch handling in c/dec/decode.c can be triggered by a crafted Brotli-compressed stream. When an application decompresses untrusted Brotli data, this can lead to memory disclosure, denial of service, or potentially arbitrary code execution.

8.1 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-787 - Out-of-bounds Write

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:brotli-0:1.2.1-0.1.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:brotli-0:1.2.1-0.1.hum1@s390x	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:brotli-0:1.2.1-0.1.hum1@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:brotli-0:1.2.1-0.1.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:brotli-devel-0:1.2.1-0.1.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:brotli-devel-0:1.2.1-0.1.hum1@s390x	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:brotli-devel-0:1.2.1-0.1.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:libbrotli-0:1.2.1-0.1.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:libbrotli-0:1.2.1-0.1.hum1@s390x	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:libbrotli-0:1.2.1-0.1.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-brotli-0:1.2.1-0.1.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-brotli-0:1.2.1-0.1.hum1@s390x	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:python3-brotli-0:1.2.1-0.1.hum1@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

11 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:87420	self
https://images.redhat.com/	external
https://access.redhat.com/security/cve/CVE-2026-111497	external
https://access.redhat.com/security/updates/classi…	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-111497	self
https://bugzilla.redhat.com/show_bug.cgi?id=2558973	external
https://access.redhat.com/security/vulnerabilitie…	external
https://www.cve.org/CVERecord?id=CVE-2026-111497	external
https://nvd.nist.gov/vuln/detail/CVE-2026-111497	external
https://nodejs.org/en/blog/vulnerability/october-…	external

JSON

To clipboard

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      "cve": "CVE-2026-111497",
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        "id": "CWE-787",
        "name": "Out-of-bounds Write"
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          "title": "Vulnerability description"
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          "text": "brotli: Out-of-Bounds Write in Google Brotli Decoder",
          "title": "Vulnerability summary"
        },
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          "category": "other",
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          "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"
        }
      ],
      "product_status": {
        "fixed": [
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          "Red Hat Hardened Images:brotli-0:1.2.1-0.1.hum1@s390x",
          "Red Hat Hardened Images:brotli-0:1.2.1-0.1.hum1@src",
          "Red Hat Hardened Images:brotli-0:1.2.1-0.1.hum1@x86_64",
          "Red Hat Hardened Images:brotli-devel-0:1.2.1-0.1.hum1@aarch64",
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          "summary": "Canonical URL",
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        },
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          "category": "external",
          "summary": "RHBZ#2558973",
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          "summary": "RHSB-2026-015",
          "url": "https://access.redhat.com/security/vulnerabilities/RHSB-2026-015"
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          "url": "https://www.cve.org/CVERecord?id=CVE-2026-111497"
        },
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111497"
        },
        {
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      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-10-21T22:13:35+00:00",
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            "Red Hat Hardened Images:brotli-devel-0:1.2.1-0.1.hum1@aarch64",
            "Red Hat Hardened Images:brotli-devel-0:1.2.1-0.1.hum1@s390x",
            "Red Hat Hardened Images:brotli-devel-0:1.2.1-0.1.hum1@x86_64",
            "Red Hat Hardened Images:libbrotli-0:1.2.1-0.1.hum1@aarch64",
            "Red Hat Hardened Images:libbrotli-0:1.2.1-0.1.hum1@s390x",
            "Red Hat Hardened Images:libbrotli-0:1.2.1-0.1.hum1@x86_64",
            "Red Hat Hardened Images:python3-brotli-0:1.2.1-0.1.hum1@aarch64",
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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:87420"
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          "details": "See the security bulletin for a detailed mitigation procedure.",
          "product_ids": [
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        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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          "products": [
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "brotli: Out-of-Bounds Write in Google Brotli Decoder"
    }
  ]
}

CVE-2026-111497 (GCVE-0-2026-111497)

Vulnerability from cvelistv5 – Published: 2026-10-22 13:35 – Updated: 2026-10-28 03:55

Title

Out-of-Bounds Write in Google Brotli Decoder

Summary

A buffer overflow vulnerability in the Brotli decoder (c/dec/decode.c) in Google Brotli versions 1.0.3 through 1.2.0 on all platforms allows a remote unauthenticated attacker to corrupt adjacent decoder state memory, disclose sensitive memory contents, cause a denial of service, or potentially execute arbitrary code using a crafted Brotli-compressed stream. Users need to update any Brotli libraries or binaries between 1.0.3 through 1.2.0 to the latest available version: 1.0.10 or 1.1.1 or 1.2.1.

Severity

9.2 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: active Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-23 00:00 UTC

CWE

CWE-787 - Out-of-bounds Write
CWE-252 - Unchecked Return Value

Assigner

Google CNA under the Google root

CNA scorecard B 77/100 over 40 records in the last 180 days details

References

18 references

URL	Tags
https://nodejs.org/en/blog/vulnerability/october-…	patch
https://github.com/andybalholm/brotli/releases/ta…	release-notesthird-party-advisory
https://ellio.tech/en/blog/node2shell-cve-2026-11…	third-party-advisory
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource
https://github.com/advisories/GHSA-9v8h-qqgm-4m35
http://www.openwall.com/lists/oss-security/2026/1…
https://lists.debian.org/debian-lts-announce/2026…
http://www.openwall.com/lists/oss-security/2026/10/24/6
http://www.openwall.com/lists/oss-security/2026/1…
http://www.openwall.com/lists/oss-security/2026/1…
https://www.aikido.dev/blog/node2shell-nodejs-bro…
https://broccoli2shell.com
https://github.com/dotnet/announcements/issues/494
https://github.com/google/brotli/releases/tag/v1.2.1
https://github.com/google/brotli/releases/tag/v1.1.1
https://github.com/google/brotli/releases/tag/v1.0.10
https://patchtheplanet.org/brotli
http://www.openwall.com/lists/oss-security/2026/1…

Impacted products

1 product

Vendor	Product	Version
Google	Brotli	Affected: 1.0.3 , < 1.0.10 (semver) Affected: 1.1.0 , < 1.1.1 (semver) Affected: 1.2.0 , < 1.2.1 (semver)

Date Public

2026-02-27 07:50

Credits

OpenAI Codex Security - Khai Tran and Sylvie Mayer

Show details on NVD website

JSON

To clipboard

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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.

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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