SB2026090763 - Multiple vulnerabilities in Comrak

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Main Vulnerability Database SB2026090763

SB2026090763 - Multiple vulnerabilities in Comrak

Published: September 7, 2026

Security Bulletin ID SB2026090763
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Uncontrolled Recursion (CVE-ID: N/A)

CWE-ID: CWE-674 - Uncontrolled Recursion

CVSSv4: 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]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled recursion in the process_email_autolinks function when processing untrusted Markdown containing numerous bare email addresses. A remote attacker can submit specially crafted Markdown to cause a denial of service.

The issue is reachable only when the GFM autolink extension is enabled.


2) Inefficient Algorithmic Complexity (CVE-ID: N/A)

CWE-ID: CWE-407 - Inefficient Algorithmic Complexity

CVSSv4: 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]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to inefficient algorithmic complexity in the autolink_delim function when processing untrusted Markdown containing URLs with many trailing closing parentheses. A remote attacker can submit specially crafted Markdown to cause a denial of service.

The issue is reachable only when the GFM autolink extension is enabled.


Remediation

Install update from vendor's website.

References