https://seclists.org/oss-sec/2026/q2/175: [CVE-2026-33691] OWASP CRS whitespace padding bypass vulnerability
Published Apr 18, 2026
·Updated
Affected Software
2 affected components
OWASP OWASP Core Rule Set
ModSecurity modsecurity
Frequently Asked Questions
1
What is the severity of CVE-2026-33691?
CVE-2026-33691 is classified as a medium severity vulnerability.
2
How do I fix CVE-2026-33691?
To fix CVE-2026-33691, ensure that your ModSecurity configuration is correctly implemented to avoid disabling security headers.
3
What software is affected by CVE-2026-33691?
CVE-2026-33691 affects the OWASP Core Rule Set and ModSecurity.
4
What does CVE-2026-33691 exploit?
CVE-2026-33691 exploits a whitespace padding bypass vulnerability in the handling of security headers.
5
When was CVE-2026-33691 published?
CVE-2026-33691 was published on April 18, 2026.