Off-by-One Error Vulnerability in Apache Tomcat Affects Multiple Versions
CVE-2026-65927

Currently unrated

Key Information:

Vendor

Apache
Status
Apache Tomcat
Vendor
CVE Published:
25 August 2026

What is CVE-2026-65927?

An off-by-one error vulnerability in Apache Tomcat affects rewrite processing by causing it to restart at the second rule instead of the first. This flaw can lead to incorrect processing of user-defined rewrite rules, potentially allowing for unintended behavior in web applications using the affected versions. Users are strongly advised to upgrade to the latest versions—11.0.25, 10.1.58, or 9.0.121—to mitigate risks associated with this vulnerability.

Affected Version(s)

Apache Tomcat 11.0.0-M1 <= 11.0.24

Apache Tomcat 10.1.0-M1 <= 10.1.57

Apache Tomcat 9.0.0.M1 <= 9.0.120

References

https://lists.apache.org/thread/st1dx1zyn5y7ny2s0sscmh6lr...
vendor-advisory

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

4ra1n, pyn3rd and unam4
.