CVEFinder.io

CVE-2026-65927

⚠️ high
Summary

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

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 Score
7.5
High
EPSS Score
0.8
Exploit Probability
Published Date
2026-08-25
First Seen: 2026-08-26
📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 67.8% of all 365,890 vulnerabilities in our database.

#117,965
Above average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: Aug 26, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
YES
Can be exploited automatically
💥 Technical Impact
Partial
Limited system impact
🏆 Discovered By
4ra1n, pyn3rd and unam4
SSVC data provided by CISA
Last Modified 2026-08-27
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE IDs (Weakness Types)
CWE-193

📦 Affected Products 3

Vendor Product Status Affected Versions
apache tomcat Affected
> 10.1.0 < 10.1.58
apache tomcat Affected
> 11.0.0 < 11.0.25
apache tomcat Affected
> 8.5.0 < 9.0.121

🔗 References 2

https://lists.apache.org/thread/st1dx1zyn5y7ny2s0ssc...
Vendor Advisory Mailing List
http://www.openwall.com/lists/oss-security/2026/08/26/5
Third Party Advisory Mailing List

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-65182 ⛔ critical 9.1 0.6 Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint bypass if a... 2026-08-25
CVE-2026-65183 ⚠️ high 8.1 0.5 Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat when creating unix domain sockets allow... 2026-08-25
CVE-2026-65637 ⛔ critical 9.8 0.8 Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990. This issue affects... 2026-08-25
CVE-2026-65905 ⛔ critical 9.8 0.8 Authentication Bypass by Capture-replay vulnerability in Apache Tomcat's DIGEST authenticator. If, before windowSize req... 2026-08-25
CVE-2026-66422 ⚠️ high 8.1 0.6 Improper Authorization vulnerability in Apache Tomcat cause by security-role-ref definitions being incorrectly used as r... 2026-08-25
CVE-2026-68525 ⛔ critical 9.1 0.6 Incorrect Authorization vulnerability in Apache Tomcat's FORM authentication process allows the bypassing of a security ... 2026-08-25
These CVEs affect the same products