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High severity · published Aug 25, 2026
CVE-2026-65927
Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control
7.5
CVSS
0.7%
EPSS
No
On KEV
Description
Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TO
Tomcat · Apache
11.0.0-M1 through 11.0.24; 10.1.0-M1 through 10.1.57; 9.0.0.M1 through 9.0.120; 8.5.0 through 8.5.100 · source: vendor, NVD
Affected product
TO
Tomcat
Apache
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-65927
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-65927
Vendor Advisory
https://lists.apache.org/thread/st1dx1zyn5y7ny2s0sscmh6lrv3worr4
Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/08/26/5
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