CVE-2026-82522 libjxl < 0.12.0 Container Box Parser Integer Underflow via 32-bit Size Truncation
Remote attackers can inject arbitrary metadata and cause out-of-bounds reads in libjxl by exploiting an integer underflow in the container box parser.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-82522?
CVE-2026-82522 is a medium-severity vulnerability in libjxl, published on 2 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-681
Which versions are affected by CVE-2026-82522?
How do I fix CVE-2026-82522?
Upgrade to a fixed version.
Is CVE-2026-82522 being exploited?
There is no known exploitation of CVE-2026-82522 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-82522, ECHO-38b6-7fa2-72b8, GHSA-8q4m-qc33-25q8, OESA-2026-4375, UBUNTU-CVE-2026-82522.