Fluid Attacks Database

Description

Apache Tomcat - Security constraint bypass with HTTP/0.9 Improper Input Validation vulnerability in Apache Tomcat.

Tomcat did not limit HTTP/0.9 requests to the GET method. If a security constraint was configured to allow HEAD requests to a URI but deny GET requests, the user could bypass that constraint on GET requests by sending a (specification invalid) HEAD request using HTTP/0.9.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.14, from 10.1.0-M1 through 10.1.49, from 9.0.0.M1 through 9.0.112.

Older, EOL versions are also affected.

Users are recommended to upgrade to version 11.0.15 or later, 10.1.50 or later or 9.0.113 or later, which fixes the issue.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Component	Affected version	Patched versions
maven	org.apache.tomcat:tomcat	>=11.0.0-m1 <11.0.15 \|\| >=10.1.0-m1 <10.1.50 \|\| >=0 <9.0.113	11.0.15, 10.1.50, 9.0.113
maven	org.apache.tomcat:tomcat-catalina	>=11.0.0-m1 <11.0.15 \|\| >=10.1.0-m1 <10.1.50 \|\| >=0 <9.0.113	11.0.15, 10.1.50, 9.0.113
debian 12	tomcat10	=10.1.10-1 \|\| =10.1.13-1 \|\| =10.1.14-1 \|\| =10.1.15-1 \|\| =10.1.16-1 \|\| =10.1.20-1 \|\| =10.1.23-1 \|\| =10.1.25-1 \|\| =10.1.25-1~bpo12+1 \|\| =10.1.25-2 \|\| =10.1.30-1 \|\| =10.1.30-1~bpo12+1 \|\| =10.1.31-1 \|\| =10.1.33-1 \|\| =10.1.33-1~bpo12+1 \|\| =10.1.34-0+deb12u1 \|\| =10.1.34-0+deb12u2 \|\| =10.1.34-1 \|\| =10.1.35-1 \|\| =10.1.40-1 \|\| =10.1.40-1~bpo12+1 \|\| =10.1.46-1 \|\| =10.1.6-1 \|\| =10.1.6-1+deb12u1 \|\| =10.1.6-1+deb12u2 \|\| =10.1.7-1 \|\| =10.1.8-1 \|\| =10.1.9-1 \|\| >=0 <10.1.52-1~deb12u1	10.1.52-1~deb12u1
debian 13	tomcat10	=10.1.40-1 \|\| =10.1.46-1 \|\| =10.1.52-1~deb12u1 \|\| >=0 <10.1.52-1~deb13u1	10.1.52-1~deb13u1
debian 14	tomcat10	=10.1.40-1 \|\| =10.1.46-1 \|\| =10.1.52-1~deb12u1 \|\| =10.1.52-1~deb13u1 \|\| >=0 <10.1.52-1	10.1.52-1
debian 13	tomcat11	=11.0.11-1 \|\| =11.0.6-1 \|\| >=0 <11.0.15-1~deb13u1	11.0.15-1~deb13u1
debian 14	tomcat11	=11.0.11-1 \|\| =11.0.15-1~deb13u1 \|\| =11.0.6-1 \|\| >=0 <11.0.15-1	11.0.15-1
debian 11	tomcat9	=9.0.43-1 \|\| =9.0.43-2 \|\| =9.0.43-2~deb11u1 \|\| =9.0.43-2~deb11u10 \|\| =9.0.43-2~deb11u11 \|\| =9.0.43-2~deb11u12 \|\| =9.0.43-2~deb11u2 \|\| =9.0.43-2~deb11u3 \|\| =9.0.43-2~deb11u4 \|\| =9.0.43-2~deb11u5 \|\| =9.0.43-2~deb11u6 \|\| =9.0.43-2~deb11u7 \|\| =9.0.43-2~deb11u8 \|\| =9.0.43-2~deb11u9 \|\| =9.0.43-3 \|\| =9.0.53-1 \|\| =9.0.54-1 \|\| =9.0.55-1 \|\| =9.0.58-1 \|\| =9.0.62-1 \|\| =9.0.63-1 \|\| =9.0.64-1 \|\| =9.0.64-2 \|\| =9.0.65-1 \|\| =9.0.67-1 \|\| =9.0.68-1 \|\| =9.0.68-1.1 \|\| =9.0.70-1 \|\| >=0 <9.0.70-2	9.0.70-2
debian 12	tomcat9	>=0 <9.0.70-2	9.0.70-2
debian 13	tomcat9	>=0 <9.0.70-2	9.0.70-2

1-10 of 21

Aliases

1. CVE-2026-247332. NVD-2026-247333. OSV-2026-247334. OSV-DEBIAN-2026-247335. GHSA-qq5r-98hh-rxc96. GCVE-2026-247337. SECURITY-TRACKER-CVE-2026-24733

References

1. https://github.com/apache/tomcat/commit/2e2fa23f2635bbb819759576a2f2f5e64ecf7c5f2. https://github.com/apache/tomcat/commit/6c73d74ff281260d74c836370ff6b82f1da8048b3. https://github.com/apache/tomcat/commit/711b465cf22684a1acf0cb43501cdbbce9b6c5f44. https://github.com/apache/tomcat5. https://lists.apache.org/thread/6xk3t65qpn1myp618krtfotbjn1qt90f6. https://tomcat.apache.org/security-10.html7. https://tomcat.apache.org/security-11.html8. https://tomcat.apache.org/security-9.html

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