Out-of-Bounds Write in Google Brotli Decoder

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-111497
StatePUBLISHED
AssignerGoogle
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-22 14:17:37 UTC
Updated2026-10-24 04:18:17 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 9.2 CRITICAL from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.004800000 probability, percentile 0.405110000 (date 2026-10-23)

Problem Types: CWE-252 | CWE-787 | CWE-787 CWE-787 Out-of-bounds Write | CWE-252 CWE-252 Unchecked Return Value

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary9.2CRITICALCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS9.2CRITICALCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Google Brotli affected 1.0.3 1.0.10 semver Not specified
CNA Google Brotli affected 1.1.0 1.1.1 semver Not specified
CNA Google Brotli affected 1.2.0 1.2.1 semver Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2026/10/msg00049.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
github.com/advisories/GHSA-9v8h-qqgm-4m35 af854a3a-2127-422b-91ae-364da2661108 github.com
nodejs.org/en/blog/vulnerability/october-2026-security-releases [email protected] nodejs.org
www.openwall.com/lists/oss-security/2026/10/23/25 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
www.imperva.com/blog/node2shell-from-brotli-data-to-remote-code-execution MITRE www.imperva.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: OpenAI Codex Security - Khai Tran and Sylvie Mayer (en)

Additional Advisory Data

Solutions

CNA: 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.

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