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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).

PUBLISHED Reserved 2026-02-03 | Published 2026-02-11 | Updated 2026-02-13 | Assigner Google




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-805

Product status

Default status
unaffected

0.9 (semver)
affected

References

github.com/libjxl/libjxl/issues/4549 exploit

github.com/libjxl/libjxl/issues/4549

cve.org (CVE-2026-1837)

nvd.nist.gov (CVE-2026-1837)

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