CVE-2026-82522: Libjxl

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

libjxl before 0.12 contains an integer underflow vulnerability in the container box parser that allows remote attackers to inject arbitrary metadata by exploiting 64-bit box size truncation to size_t on 32-bit platforms. Attackers can supply a crafted JPEG XL file causing the decoder to parse attacker-controlled codestream bytes as phantom box headers, enabling injection of arbitrary metadata (Exif, XMP, IPTC, JUMBF) and potential out-of-bounds reads.

Affected products

• Libjxl Libjxl: before 0.12.0 (fixed in 0.12.0)

Published 2026-09-02. Last modified 2026-09-23.