VULNERABILITY INTELLIGENCE

CVE-2026-40890

CVSS score7.5 HIGH

EPSS probability0.35%

CISA KEVNot currently listed

Published2026-04-21

Last modified2026-10-26

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

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.

Weakness classification

CWE-125: Out-of-bounds Read

Primary references

security-advisories@github.com — Patch
security-advisories@github.com — Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Vendor Advisory