CVE-2026-1837A specially-crafted file can cause libjxl's decoder to write pixel data to uninitialized unallocated memory.
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No exploitation reported and no EPSS estimate yet.
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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).
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-805, CWE-770, CWE-787
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
libjxl_project libjxl libjxl_project:libjxl | from 0.9.0 through 0.11.1 | NVD |
References
- https://github.com/libjxl/libjxl/issues/4549exploit, issue-tracking, patch
- https://access.redhat.com/security/cve/CVE-2026-1837
- https://bugzilla.redhat.com/show_bug.cgi?id=2438974
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1837.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.