CVE-2026-111497
CRITICAL severity · CVSS 9.8 · CWE-252 · actively exploited (CISA KEV)
9.8CVSS CRITICAL exploited
Actively exploited in the wild (CISA Known Exploited Vulnerabilities).
Added to KEV 2026-10-27. US federal agencies must patch by 2026-11-10.
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)83%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Recommendation
This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.
Additional information
- NVD record
- 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---highAdvisory
- http://www.openwall.com/lists/oss-security/2026/10/23/25Advisory
- http://www.openwall.com/lists/oss-security/2026/10/24/6Advisory
- http://www.openwall.com/lists/oss-security/2026/10/26/12Advisory
- http://www.openwall.com/lists/oss-security/2026/10/26/13Advisory
- http://www.openwall.com/lists/oss-security/2026/10/26/16Advisory
- https://broccoli2shell.comAdvisory