CVE-2026-104454
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| YesWiki | yeswiki | 0 < 4.6.7 | affected |
| YesWiki | yeswiki | 4.6.7 | unaffected |
Weaknesses
- CWE-1333: Inefficient Regular Expression Complexity
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: yes
- Technical Impact: partial
Additional References
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-edit-preview-endpoint
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