Affected: Google libjxl, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9

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).

Affected: Ubuntu:25.10: jpeg-xl

Daniel Novomeský discovered that libjxl did not properly manage memory when decoding certain files. An attacker could use this issue to cause libjxl to crash, resulting in denial of service, or possibly execute arbitrary code.