CVE-2026-104454

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

Product

Yeswiki

PublishedOct 2, 2026

First seenOct 2, 2026

Weakness typeCWE-1333CWE-1333

How to fix

Update

YesWiki yeswiki4.6.7 or later

Vendor advisories

github.com/YesWiki/yeswiki/security/advisories/GHSA-gf57-wg5m-h34q

Affected products

Product	Affected versions	Fixed in
YesWiki yeswiki	v < 4.6.7	4.6.7

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