CVE-2026-111497
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.
- CVSS 4.0
- 9.2
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 - EPSS
- 33% chance of exploitation in the next 30 days; higher than 98% of CVEs (scores of 2026-10-25)
- CWEs
- CWE-252, CWE-787
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-9v8h-qqgm-4m35 | PyPI | brotli | >=1.0.3 <1.2.1 | 1.2.1 |
| GHSA-9v8h-qqgm-4m35 | PyPI | brotlicffi | >=1.0.3 <1.2.1.0 | 1.2.1.0 |
| PYSEC-2026-4322 | PyPI | brotli | <1.2.1 | 1.2.1 |
| PYSEC-2026-4323 | PyPI | brotlicffi | <1.2.1.0 | 1.2.1.0 |
References
- 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