PT-2026-52033

CVE-2026-49851

Published

2026-06-24

Updated

2026-07-13

Description by

CVSS 4.0

8.7

High

MetricsAV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Mistune versions prior to 3.3.0

Description A CPU exhaustion Denial of Service (DoS) occurs due to superlinear (approximately O(n²)) behavior in the parse link text() function. When processing Markdown containing numerous consecutive [ characters, the function repeatedly scans the input using a regex search within a loop, re-scanning large portions of the remaining string in each iteration. This quadratic-time behavior allows an attacker to trigger excessive CPU usage using a small payload.

Recommendations Update to version 3.3.0.

Exploitability

Exploit

Fix

Impacts

Researchers

Osidb Bzimport

Vendors

Affected products

Weakness enumeration

CWE-770: Allocation of Resources Without Limits or Throttling

CWE-1333: Inefficient Regular Expression Complexity