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CVE-2026-40890

7.5 · HIGH

The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML.

Published Apr 21, 2026CWE-125EPSS 0.52%

Overview

CVE-2026-40890 is a high-severity vulnerability. It was published on April 21, 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

The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a < character that is not followed by a > character anywhere in the remaining text with a SmartypantsRenderer will lead to Out of Bounds read or a panic. This vulnerability is fixed with commit 759bbc3e32073c3bc4e25969c132fc520eda2778.

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/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778GitHubgithub.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7GitHubgithub.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-40890?

CVE-2026-40890 is a high-severity vulnerability. It was published on April 21, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-40890?

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-2026-40890?

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-2026-40890?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-40890 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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