A specially-crafted file can cause libjxl's decoder to write pixel data to uninitialized unallocated memory. Soon after that data from another uninitialized unallocated region is copied to pixel data.

This can be done by requesting color transformation of grayscale images to another grayscale color space. Buffers allocated for 1-float-per-pixel are used as if they are allocated for 3-float-per-pixel. That happens only if LCMS2 is used as CMS engine. There is another CMS engine available (selected by build flags).
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 12 Feb 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787
References
Metrics threat_severity

None

cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

threat_severity

Important


Wed, 11 Feb 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Google
Google libjxl
Vendors & Products Google
Google libjxl

Wed, 11 Feb 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 11 Feb 2026 15:45:00 +0000

Type Values Removed Values Added
Description A specially-crafted file can cause libjxl's decoder to write pixel data to uninitialized unallocated memory. Soon after that data from another uninitialized unallocated region is copied to pixel data. This can be done by requesting color transformation of grayscale images to another grayscale color space. Buffers allocated for 1-float-per-pixel are used as if they are allocated for 3-float-per-pixel. That happens only if LCMS2 is used as CMS engine. There is another CMS engine available (selected by build flags).
Title libjxl: Out-of-bounds write in grayscale color transformation when using LCMS2
Weaknesses CWE-805
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Google

Published:

Updated: 2026-02-11T20:01:57.952Z

Reserved: 2026-02-03T16:27:32.730Z

Link: CVE-2026-1837

cve-icon Vulnrichment

Updated: 2026-02-11T20:01:25.375Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-11T16:16:04.697

Modified: 2026-02-11T20:16:07.710

Link: CVE-2026-1837

cve-icon Redhat

Severity : Important

Publid Date: 2026-02-11T15:19:55Z

Links: CVE-2026-1837 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-02-11T21:37:51Z

Weaknesses