RHSA-2026:90890 — Security Advisory

An update for brotli is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Brotli is a generic-purpose lossless compression algorithm that compresses data using a combination of a modern variant of the LZ77 algorithm, Huffman coding and 2nd order context modeling, with a compression ratio comparable to the best currently available general-purpose compression methods. It is similar in speed with deflate but offers more dense compression.

Security Fix(es):

• brotli: Out-of-Bounds Write in Google Brotli Decoder (CVE-2026-111497)

Bug Fix(es) and Enhancement(s):

• Incorrect Python parameter name in brotli makes CVE-2025-66471 fixes ineffective (JIRA:RHEL-221128)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.