Vulnerability in Libjxl
CVE-2026-82522
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- Patch Commit (patch)
- Pull Request (issue-tracking)
- Release Notes (release-notes)
- www.vulncheck.com/advisories/libjxl-container-box-parser-integer-underflow-via-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82522?
- CVE-2026-82522 is a medium-severity vulnerability in Libjxl, classified under Incorrect Conversion between Numeric Types. CVSS score: 5.4/10. Published 2026-09-02.
- How severe is CVE-2026-82522?
- Medium severity. CVSS v3 base score is 5.4 out of 10.