Google Brotli up to 1.0.3/1.1.0/1.2.0 Brotli decoder c/dec/decode.c buffer overflow

Summaryinfo

A vulnerability was found in Google Brotli up to 1.0.3/1.1.0/1.2.0. It has been classified as critical. This issue affects some unknown processing of the file c/dec/decode.c of the component Brotli decoder. The manipulation leads to buffer overflow. This vulnerability is uniquely identified as CVE-2026-111497. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Google Brotli up to 1.0.3/1.1.0/1.2.0. This issue affects an unknown code block of the file c/dec/decode.c of the component Brotli decoder. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at nodejs.org. The identification of this vulnerability is CVE-2026-111497 since 10/16/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/22/2026).

Upgrading to version 1.0.10, 1.1.1 or 1.2.1 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Google

Name

• Brotli

Version

• 1.0
• 1.0.0
• 1.0.1
• 1.0.2
• 1.0.3
• 1.1
• 1.1.0
• 1.2.0

License

• free

Website

• Vendor: https://www.google.com/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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