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.
Affected products
gomarkdown: markdown
References3
- github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx… ExploitVendor Advisory
- github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx… ExploitVendor Advisory
- github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c… Patch
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 29 · as of 13 November 2026
- CWE
- CWE-125
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.