Critical 9.2Published Oct 22, 2026

CVE-2026-111497Out-of-Bounds Write in Google Brotli Decoder

Updated under an hour ago (Oct 27, 2026, 3:50 PM ET)

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It affects Google Brotli. Add what you run to find out whether that includes you.

CISA assesses it as actively exploited, ahead of any KEV listing. Put it on your emergency patch path.

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Every CVE for Google Brotli

Exploited in the last 30 days

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: 9.2 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-787, CWE-252
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.71% (percentile 53)
Assigned by: Google
NVD analysis: Awaiting Analysis
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 22, 2026

Affected products

Affected products

Google Brotli google:brotli (from the name)	from 1.0.3 before 1.0.10; from 1.1.0 before 1.1.1; from 1.2.0 before 1.2.1	CNA record

References

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	patch
https://github.com/andybalholm/brotli/releases/tag/v1.2.7	release-notes, third-party-advisory
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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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.