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CVE-2026-111497

Microsoft — Google: CVE-2026-111497 Buffer overflow vulnerability in the Brotli decoder

Microsoft · CWE-252 | CWE-787 — Out-of-bounds write

Patch Tuesday
41

EVRS 41 of 100 Elevated

Scheduled Maintenance

Rank 1,368 of 2,963 tracked

Download PDF

Why it scores 41

Evidence available: 6 of 8 signals

An EPSS probability of 0.328, and Microsoft Exploitability Index: Exploitation More Likely.

  • CISA KEVDid not apply
  • RansomwareNo data
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexApplied
  • Pre-patch disclosureDid not apply
  • KEV recencyNo data
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Ransomware, KEV recency. Why some signals show no data

Fix

Patch or fixed version identified

Fixed in

Red Hat Hardened Images -> brotli-0:1.2.1-0.1.hum1@aarch64 | openSUSE Tumbleweed -> brotli-0:1.2.1-1.1.aarch64 | openSUSE Tumbleweed -> corepack24-0:24.22.1-1.1.aarch64 | brotli -> 1.0.9-2+deb12u1 | brotli -> 1.1.0-2+deb13u1

Affected versions

Not identified by the connected sources

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 8.1 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.328 (98.3rd pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Not confirmed Patch Tuesday
Public exploit moduleA module existing is not the same as active exploitation. None known Metasploit
EUVD cross-referenceENISA's record: CVSS 9.2 (v4.0), assigned by Google. Listed ENISA EUVD

Description

NVD

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.