CVE-2026-40890

HIGH

github.com/gomarkdown/markdown: Out-of-bounds Read in SmartypantsRenderer

Title source: cna

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.

References (2)

[X_Refsource_Confirm] https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7

[X_Refsource_Misc] https://github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778

View Writeup ZIP pw:eip

Scores

CVSS v3 7.5

EPSS 0.0004

EPSS Percentile 11.3%

Attack Vector NETWORK

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

Details

CWE

CWE-125

Status published

Products (1)

gomarkdown/markdown < 759bbc3e32073c3bc4e25969c132fc520eda2778

Published Apr 21, 2026

Tracked Since Apr 22, 2026