What’s Vulnerable › Vulnerabilities

CVE-2026-82522: libjxl < 0.12.0 Container Box Parser Integer Underflow via 32-bit Size Truncation

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-09-23
• Weakness: CWE-681

Description

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: before 0.12.0 — fixed in 0.12.0

How to fix

Upgrade to a fixed version: libjxl 0.12.0. Check the vendor advisory for mitigations.

References

• https://github.com/libjxl/libjxl/commit/22ad80af1454f0444ea34115e49ed40517147d68
• https://github.com/libjxl/libjxl/pull/4885
• https://github.com/libjxl/libjxl/releases/tag/v0.12.0
• https://www.vulncheck.com/advisories/libjxl-container-box-parser-integer-underflow-via-32-bit-size-truncation

Get alerted when CVE-2026-82522 or the next vulnerability affects your stack