CVE-2026-52584

A flaw was found in libjxl. This buffer overflow vulnerability allows a local attacker to obtain sensitive information. The flaw occurs within the DecodeImageAPNG function, which can lead to unauthorized disclosure of data.

Red Hat ships libjxl as a bundled component within Firefox and Thunderbird. The vulnerable code path is in the APNG decoder (DecodeImageAPNG), which is part of the extras module used by command-line tools. Firefox and Thunderbird have their own native APNG implementation and may not invoke libjxl's APNG decoder, limiting the practical exploitability of this flaw in Red Hat products.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.