CVE-2025-12474 PUBLISHED

libjxl: Uninitialized memory read in decoder due to incorrect optimization in patch handling

Assigner: Google
Reserved: 29.10.2025 Published: 11.02.2026 Updated: 11.02.2026

A specially-crafted file can cause libjxl's decoder to read pixel data from uninitialized (but allocated) memory.

This can be done by causing the decoder to reference an outside-image-bound area in a subsequent patches. An incorrect optimization causes the decoder to omit populating those areas.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS Score: 2.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	Low	Confidentiality	None
Attack Complexity	High	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	None
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	Google
Product	libjxl
Versions	Default: unaffected affected from 0.7 to 0.11.1 (incl.)

References

https://github.com/libjxl/libjxl/pull/4495

Problem Types

CWE-908 Use of Uninitialized Resource CWE

Impacts

CAPEC-44 Overflow Binary Resource File