Authentication Bypass by Capture-replay in Apache Tomcat - CVE-2026-65905
Published: August 26, 2026
Vulnerability identifier: #VU145382
CSH Severity: Low
CVSS v4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-65905
CWE-ID: CWE-294
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to replay a DIGEST-authenticated request once.
The vulnerability exists due to improper authentication in DIGEST authentication replay protection when processing a DIGEST-authenticated request with a nonceCount on the upper boundary of the replay window before windowSize requests had been made. A remote user can send and replay a crafted DIGEST-authenticated request to replay a DIGEST-authenticated request once.
The issue only occurs while the associated nonceCount remains within the replay window.
Affected software
Apache Tomcat
How to mitigate CVE-2026-65905
Install security update from vendor's website.
Apache Tomcat - addressed in versions 9.0.121, 10.1.59, 11.0.25