Bug 2438974 (CVE-2026-1837) - CVE-2026-1837 libjxl: libjxl: Out-of-bounds write in grayscale color transformation when using LCMS2
Summary: CVE-2026-1837 libjxl: libjxl: Out-of-bounds write in grayscale color transfor...
Keywords:
Status: NEW
Alias: CVE-2026-1837
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-11 16:01 UTC by OSIDB Bzimport
Modified: 2026-02-11 18:42 UTC (History)
5 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-02-11 16:01:53 UTC 
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).
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