Summary
generated automatically from NVD dataCVE-2026-111497 is a buffer overflow in the Brotli decoder (c/dec/decode.c) in Google Brotli 1.0.3 through 1.2.0. A crafted Brotli-compressed stream sent by a remote unauthenticated attacker can corrupt adjacent decoder state memory, leak memory contents, cause denial of service, or potentially allow arbitrary code execution. It is listed in the CISA KEV catalog and carries a CVSS v3.1 score of 9.8 (CRITICAL); the description advises updating to 1.0.10, 1.1.1 or 1.2.1.
NVD 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.
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-10-27. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-11-10
EPSS · FIRST.org
55.5%probability of exploitation in the next 30 days
Higher than 99% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-27, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
This CVE is covered in an article: context, affected versions and published fixes.
CVSS v3.1 Score
Information
- Published
- 22 oct. 2026
- Updated
- 28 oct. 2026
- Status
- Analyzed
- Source
- cve-coordination@google.com
Affected products
Bounds published by NVD: "< 8.4.27" means 8.4.27 is no longer vulnerable. The fixed release to install is in the vendor advisory.
Weaknesses (CWE)
References (18)
- http://www.openwall.com/lists/oss-security/2026/10/23/25Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/24/6Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/26/12Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/26/13Mailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/26/16Mailing ListThird Party Advisory
- https://broccoli2shell.comThird Party Advisory
- https://github.com/advisories/GHSA-9v8h-qqgm-4m35Third Party Advisory
- https://github.com/dotnet/announcements/issues/494Issue TrackingMitigationThird Party Advisory
- https://github.com/google/brotli/releases/tag/v1.1.1Release Notes
- https://github.com/google/brotli/releases/tag/v1.2.1Release Notes
- https://lists.debian.org/debian-lts-announce/2026/10/msg00049.htmlMailing ListThird Party Advisory
- https://patchtheplanet.org/brotliThird Party Advisory
- + 3 more references on NVD
Similar CVEs
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