Vulnerability Intelligence Report
Out-of-Bounds Write in Google Brotli Decoder
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.
CISA KEV
Nuclei Template
SSVC: Active Exploitation
CVSS Base Score
9.2
CRITICAL
EPSS Probability:55.48%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
—
Weaponization
—
SSVC Action
—
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Brotli | 1.0.3 < 1.0.10 (affected), 1.1.0 < 1.1.1 (affected), 1.2.0 < 1.2.1 (affected) |
Threat Intelligence Signals
CISA KEV
ACTIVE IN CATALOG
Nuclei Template
SCANNER AVAILABLE
EPSS Score
55.483%
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Google LLC · Vendor · USA |
| Reserved | 2026-10-16T09:58:17 |
| Published | 2026-10-22T13:35:41 |
| Patch Date | 2026-02-27 |
| Last Updated | 2026-10-27T19:59:03 |
Community Chatter & Buzz