# CVE-2026-82522

## Summary

- **CVE ID:** CVE-2026-82522
- **Severity:** MEDIUM
- **CVSS Score:** 5.4 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-681
- **Published:** Sep 2, 2026
- **Last Modified:** Sep 2, 2026

## 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 — libjxl (0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.23%
- **EPSS Percentile:** 14.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._