libjxl < 0.12.0 Container Box Parser Integer Underflow via 32-bit Size Truncation (CVE-2026-82522) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-82522

libjxl < 0.12.0 Container Box Parser Integer Underflow via 32-bit Size Truncation

Answer in brief

CVE-2026-82522 records a Unknown severity vulnerability in libjxl < 0.12.0 Container Box Parser Integer Underflow via 32-bit Size Truncation. The current sources do not mark it as known exploited. The current feed maps libjxl/libjxl (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 2, 2026Updated Sep 2, 2026Source checked Sep 2, 2026First seen by HOL Sep 2, 2026Material review Sep 2, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps libjxl/libjxl (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
libjxl/libjxlgeneric	>=0 <0.12.0	0.12.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for libjxl/libjxl.
Review the reported fix. Update libjxl/libjxl to 0.12.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 2, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 2, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.