CVE-2026-115348CWE-400denial-of-service

CVE-2026-115348

High · published October 22, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
28.4
In the wild
Unconfirmed
What it is

Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity vulnerability in the inline link parser's parse_link_text function that allows unauthenticated attackers to exhaust CPU with unbalanced brackets. Attackers can submit Markdown containing many unbalanced '[' or '![' characters, forcing repeated unbounded forward scans and tying up worker processes for minutes.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00359 · 28.4th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-10-22T23:17Z
References (2)
https://github.com/lepture/mistune/security/advisories/GHSA-x2gr-6qf2-fc9x · [email protected]https://www.vulncheck.com/advisories/mistune-before-3.3.0-quadratic-time-dos-via-parse-link-text · [email protected]
EPSS history
Timeline
  • 24 OCT 03:52Z
    EPSS moved — → 0%
    epss
  • 22 OCT 19:13Z
    Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text
    cvelistv5
  • 22 OCT 19:13Z
    Mistune before 3.3.0 Quadratic-Time DoS via parse_link_text
    cvelistv5