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CVE-2026-1837

7.5 · HIGH

A specially-crafted file can cause libjxl's decoder to write pixel data to uninitialized unallocated memory.

Published Feb 11, 2026CWE-805EPSS 0.32%

Overview

CVE-2026-1837 is a high-severity vulnerability. It was published on February 11, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

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).

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/libjxl/libjxl/issues/4549Refaccess.redhat.com/security/cve/CVE-2026-1837Refbugzilla.redhat.com/show_bug.cgi?id=2438974GitHubgithub.com/libjxl/libjxl/issues/4549Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1837.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-1837?

CVE-2026-1837 is a high-severity vulnerability. It was published on February 11, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-1837?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-1837?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-1837?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-1837 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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