CVE-2025-29914: OWASP Coraza WAF has parser confusion which leads to wrong URI in `REQUEST_FILENAME`

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-03-20 · updated 2026-06-17
Weakness: CWE-706

Description

OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. Prior to 3.3.3, if a request is made on an URI starting with //, coraza will set a wrong value in REQUEST_FILENAME. For example, if the URI //bar/uploads/foo.php?a=b is passed to coraza: , REQUEST_FILENAME will be set to /uploads/foo.php. This can lead to a rules bypass. This vulnerability is fixed in 3.3.3.

Affected products

corazawaf coraza: before 3.3.3

References

https://github.com/corazawaf/coraza/commit/4722c9ad0d502abd56b8d6733c6b47eb4111742d
https://github.com/corazawaf/coraza/security/advisories/GHSA-q9f5-625g-xm39

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