CVE-2026-40890 | THREATINT

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.

PUBLISHED Reserved 2026-04-15 | Published 2026-04-21 | Updated 2026-04-21 | Assigner GitHub_M

HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-125: Out-of-bounds Read

Product status

< 759bbc3e32073c3bc4e25969c132fc520eda2778

affected

References

github.com/...rkdown/security/advisories/GHSA-77fj-vx54-gvh7 exploit

github.com/...rkdown/security/advisories/GHSA-77fj-vx54-gvh7

github.com/...ommit/759bbc3e32073c3bc4e25969c132fc520eda2778

cve.org (CVE-2026-40890)

nvd.nist.gov (CVE-2026-40890)

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