CVE-2026-111497

Description

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.

Scoring

• CVSS: 9.8 (CRITICAL, 3.1)
• EPSS exploitation probability: Not yet available
• EPSS percentile: Not yet available

CISA KEV status

• Added to KEV: 2026-10-27
• Remediation due date: 2026-11-10
• Known ransomware campaign use: Unknown

Weakness types (CWE)

• CWE-252
• CWE-787

References

• https://github.com/andybalholm/brotli/releases/tag/v1.2.7
• https://nodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permits-remote-code-execution-cve-2026-111497---high
• http://www.openwall.com/lists/oss-security/2026/10/23/25
• http://www.openwall.com/lists/oss-security/2026/10/24/6
• http://www.openwall.com/lists/oss-security/2026/10/26/12
• http://www.openwall.com/lists/oss-security/2026/10/26/13
• http://www.openwall.com/lists/oss-security/2026/10/26/16
• https://broccoli2shell.com
• https://github.com/advisories/GHSA-9v8h-qqgm-4m35
• https://github.com/dotnet/announcements/issues/494

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