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Vulnerability record · CVE-2026-40890 · published 21 April 2026

CVE-2026-40890: Gomarkdown markdown out-of-bounds read vulnerability

Gomarkdown · Markdown

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.

7.5 CVSS 3.1 High EPSS 0.52% · top 58.5% CWE-125 · Out-of-bounds read
7.5CVSS 3.1 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778 Patch
https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7 ExploitVendor Advisory
https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2023-42821Gomarkdown markdown out-of-bounds read vulnerabilityThe package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-202309221…EPSS 1.3%8.8CVE-2026-11645Google Chrome V8 out-of-bounds read and write enables sandbox code executionGoogle Chrome before 149.0.7827.103 contains an out-of-bounds read and write in the V8 JavaScript engine. A crafted HTML page can trigger the memory …KEVEPSS 2.2%analysed7.8CVE-2023-36424Windows Common Log File System Driver out-of-bounds read privilege escalationCVE-2023-36424 is an out-of-bounds read (CWE-125) in the Windows Common Log File System (CLFS) driver that allows elevation of privilege. It affects …KEVEPSS 12%analysed9.3CVE-2026-3055Citrix NetScaler ADC and Gateway SAML IDP memory overreadNetScaler ADC and NetScaler Gateway, when configured as a SAML identity provider, fail to validate input sufficiently, causing an out-of-bounds memor…KEVEPSS 4.0%analysed9.3CVE-2025-5777Citrix NetScaler ADC/Gateway memory overread via insufficient input validationCVE-2025-5777 is an insufficient input validation flaw in Citrix NetScaler ADC and NetScaler Gateway that causes a memory overread when the appliance…KEVEPSS 100%analysed8.8CVE-2025-5419Google Chrome V8 out-of-bounds read and write enables heap corruptionV8 in Google Chrome before 137.0.7151.68 contains an out-of-bounds read and write that a remote attacker can trigger with a crafted HTML page, leadin…KEVEPSS 7.8%analysed7.1CVE-2024-53150Linux kernel ALSA USB-audio out-of-bounds read in clock descriptor parsingThe Linux kernel ALSA USB-audio driver fails to validate the bLength field of clock descriptors while traversing them, so a device supplying a malfor…KEVEPSS 1.4%analysed5.5CVE-2025-24991Windows NTFS out-of-bounds read allows local information disclosureWindows NTFS contains an out-of-bounds read (CWE-125) that lets an authorized attacker disclose information locally. The flaw is rated CVSS 3.1 5.5 (…KEVEPSS 2.0%analysed

Source: NIST National Vulnerability Database (record CVE-2026-40890), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.