CVEFinder.io

CVE-2026-65905

⛔ critical
Summary

Authentication Bypass by Capture-replay vulnerability in Apache Tomcat's DIGEST authenticator. If, before windowSize requests have been made, a client makes a DIGEST authenticated request with a nonceCount on the upper boundary of the replay window then that request is replayable once only while the associated nonceCount remains within the replay window.   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. Th

Description

Authentication Bypass by Capture-replay vulnerability in Apache Tomcat's DIGEST authenticator. If, before windowSize requests have been made, a client makes a DIGEST
authenticated request with a nonceCount on the upper boundary of the
replay window then that request is replayable once only while the
associated nonceCount remains within the replay window.



 

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, from 7.0.30 through 7.0.109. 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
9.8
Critical
EPSS Score
0.8
Exploit Probability
Published Date
2026-08-25
First Seen: 2026-08-26
📊 Relative Risk Intelligence

This CVE is Very High Risk - more severe than 90.6% of all 365,890 vulnerabilities in our database.

#34,455
Top 10% most severe
Severity Percentile
🎯 CISA SSVC Assessment Updated: Aug 26, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
YES
Can be exploited automatically
💥 Technical Impact
Total
Complete system compromise possible
🏆 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:H/I:H/A:H
CWE IDs (Weakness Types)
CWE-294

📦 Affected Products 4

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
> 7.0.30 < 7.0.109
apache tomcat Affected
> 8.5.0 < 9.0.121

🔗 References 2

https://lists.apache.org/thread/9v114xlpgbzrrbzz5vf9...
Vendor Advisory Mailing List
http://www.openwall.com/lists/oss-security/2026/08/26/4
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-2026-65927 ⚠️ high 7.5 0.8 Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing t... 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