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

Quick assessment

Affected
Google Brotli
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google Brotli 在 1.0.3 至 1.2.0 版本（所有平台）的解码器（c/dec/decode.c）中存在缓冲区溢出漏洞。该漏洞允许远程未认证攻击者通过构造恶意的 Brotli 压缩流，破坏相邻的解码器状态内存，从而泄露敏感内存内容、导致拒绝服务（DoS），甚至可能执行任意代码。 用户需将 1.0.3 至 1.2.0 范围内的任何 Brotli 库或二进制文件升级至最新可用版本：1.0.10、1.1.1 或 1.2.1。

CVSS 9.2 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-111497

Vulnerability Information
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Vulnerability Title
Out-of-Bounds Write in Google Brotli Decoder
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Google Brotli 1.0.3 ~ 1.0.10 -

II. Public POCs for CVE-2026-111497

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III. Intelligence Information for CVE-2026-111497

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Other References for CVE-2026-111497 (1)

IV. Related Vulnerabilities

Same product: Brotli
Same vendor: Google
Same weakness: CWE-787

V. Comments for CVE-2026-111497

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