CVE-2026-105830CWE-400denial-of-service

CVE-2026-105830

High · published October 8, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
29.4
In the wild
Unconfirmed
What it is

league/commonmark from 2.0.0 before 2.10.2 contains a quadratic-time denial of service vulnerability in the GitHub Flavored Markdown Table extension's TableStartParser::tryStart() block-start scan. Unauthenticated attackers can submit a large paragraph of pipe-free lines not starting with letters, forcing repeated full-buffer strpos scans that exhaust PHP worker CPU.

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
0.00367 · 29.4th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-10-08T19:17Z
References (3)
https://github.com/thephpleague/commonmark/security/advisories/GHSA-3q6v-r5mr-hxv8 · [email protected]https://www.vulncheck.com/advisories/league-commonmark-2.0.0-before-2.10.2-quadratic-dos-via-tablestartparser · [email protected]https://github.com/thephpleague/commonmark/security/advisories/GHSA-3q6v-r5mr-hxv8 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 10 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 08 OCT 14:10Z
    league/commonmark 2.0.0 before 2.10.2 Quadratic DoS via TableStartParser
    cvelistv5
  • 08 OCT 14:10Z
    league/commonmark 2.0.0 before 2.10.2 Quadratic DoS via TableStartParser
    cvelistv5