# CVE-2026-40890

> Vulnerability · severity: **HIGH** (CVSS 7.5).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40890
- **Published:** 2026-04-21
- **CVSS severity:** HIGH
- **CVSS base score:** 7.5
- **CWE codes:** CWE-125

## Affected products

- `gomarkdown:markdown`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40890

## Citation

> AI Analytics. CVE-2026-40890. Retrieved 2026-08-08 from https://api.ai-analytics.org/cve/CVE-2026-40890. Derived from NIST NVD. Licensed CC0.

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