CVE-2020-36846: Timlegge Io::compress::brotli

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

A buffer overflow, as described in CVE-2020-8927, exists in the embedded Brotli library.  Versions of IO::Compress::Brotli prior to 0.007 included a version of the brotli library prior to version 1.0.8, where an attacker controlling the input length of a "one-shot" decompression request to a script can trigger a crash, which happens when copying over chunks of data larger than 2 GiB. It is recommended to update your IO::Compress::Brotli module to 0.007 or later. If one cannot update, we recommend to use the "streaming" API as opposed to the "one-shot" API, and impose chunk size limits.

Affected products

• Timlegge Io::compress::brotli: before 0.007 (fixed in 0.007)

Published 2025-05-30. Last modified 2026-06-17.