CVE-2026-104454CWE-1333

CVE-2026-104454

Medium · published October 2, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
33.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v4.0
6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS
0.00401 · 33.2th percentile
Weakness
CWE-1333 · Inefficient Regular Expression Complexity
Published
2026-10-02T16:17Z
References (3)
https://github.com/YesWiki/yeswiki/security/advisories/GHSA-gf57-wg5m-h34q · [email protected]https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-redos-via-wakka-php-edit-preview-endpoint · [email protected]https://github.com/YesWiki/yeswiki/security/advisories/GHSA-gf57-wg5m-h34q · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 04 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 02 OCT 11:38Z
    YesWiki before 4.6.7 ReDoS via wakka.php Edit-Preview Endpoint
    cvelistv5