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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| libjxl | libjxl | < 0.12.0 | 0.12.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | jpeg-xl | No fix yet | — |
| Debian 13 | jpeg-xl | No fix yet | — |
| Debian 12 | jpeg-xl | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | jpeg-xl | No fix yet | — |
| Ubuntu 26.04 LTS | jpeg-xl | No fix yet | — |
| Ubuntu 24.04 LTS | jpeg-xl | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | libjxl | 0.10.5-150700.4.15.1 | SUSE-SU-2026:5131-1 |
Advisories 1
- SUSE-SU-2026:5131-1 Security update for libjxl SUSE / openSUSE Security Updates · Nov 10, 2026
References
- libjxl 0.12.0 Release Notes release-notes
- Pull Request issue-tracking patch
- Patch Commit patch
- https://www.vulncheck.com/advisories/libjxl-container-box-parser-integer-underflow-via-32-bit-size-truncation third-party-advisory