What is GHSA-84gc-h84g-h8g5?

GHSA-84gc-h84g-h8g5 is a security advisory published by GitHub Security Advisories with High severity. Mistune before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser...

Which CVE IDs does GHSA-84gc-h84g-h8g5 cover?

GHSA-84gc-h84g-h8g5 covers the following CVE IDs: CVE-2026-115352. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-84gc-h84g-h8g5?

GHSA-84gc-h84g-h8g5 has a CVSS v3 base score of 7.5, published by GitHub Security Advisories.

GHSA-84gc-h84g-h8g5HighCVSS 7.5

Mistune before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser...

Vendor

GitHub Security Advisories

Published

October 22, 2026

Last Modified

October 22, 2026

🔗 CVE IDs covered (1)

CVE-2026-115352 →

📋 Description

Mistune before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser that allows unauthenticated attackers to exhaust CPU by submitting long runs of unmatched '[' characters. Attackers can send small markdown payloads that trigger O(N^2) parse_link_text and parse_link_label probing, occupying rendering workers for 30+ seconds per 16 KB input.

🔗 References (4)

https://github.com/lepture/mistune/security/advisories/GHSA-xrpv-r66x-8p7j
https://nvd.nist.gov/vuln/detail/CVE-2026-115352
https://www.vulncheck.com/advisories/mistune-before-3.3.0-quadratic-time-dos-via-unmatched-brackets-in-inline-parser
https://github.com/advisories/GHSA-84gc-h84g-h8g5