CVE WatchJul 15, 2026

CVE-2026-1837

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

CVSS

7.5

High

EPSS

0.3%

p20

KEV

—

Exploit Today

0-100

Published: Feb 11, 2026 · Last modified: Jul 15, 2026 · CWE-805 · CWE-770 · CWE-787

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-08-072026-09-03

Technical 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).

Official references

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