Vulnerability Description
YesWiki before 4.6.7 contains an algorithmic-complexity denial of service in the wakka.php formatter due to an O(n^2) markdown-link regex. Unauthenticated attackers can submit a small crafted body of bracket characters to the page-edit preview endpoint to pin PHP-FPM workers and saturate the pool.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/YesWiki/yeswiki/security/advisories/GHSA-gf57-wg5m-h34q
- https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-redos-via-wakka-php-ed
- https://github.com/YesWiki/yeswiki/security/advisories/GHSA-gf57-wg5m-h34q
FAQ
What is CVE-2026-104454?
CVE-2026-104454 is a vulnerability with a CVSS score of 5.3 (MEDIUM). YesWiki before 4.6.7 contains an algorithmic-complexity denial of service in the wakka.php formatter due to an O(n^2) markdown-link regex. Unauthenticated attackers can submit a small crafted body of ...
How severe is CVE-2026-104454?
CVE-2026-104454 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-104454?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.