CRITICAL

CVE-2026-65905

Apache Tomcat: Limited replay attack possible with DIGEST authentication

CVSS v3

9.8

CRITICAL

EPSS Score

0.6 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for tomcat.

Set up CVE WatchFree account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

org.apache.tomcat:tomcatMavenfrom 9.0.0.M1 · fixed in 9.0.121and 2 other packages
tomcatBitnamifrom 7.0.30 · fixed in 9.0.121

Vendor advisories

CVE-2026-65905 Red Hat Product Security110 products fixed · 65 known affected
tomcat: Apache Tomcat: Authentication bypass via limited replay attack in DIGEST authenticator
tomcat as a component of Red Hat Enterprise Linux 10 · tomcat-admin-webapps as a component of Red Hat Enterprise Linux 10 · tomcat-docs-webapp as a component of Red Hat Enterprise Linux 10
RHSA-2026:76952 Red Hat Product Security33 products fixed
Red Hat Security Advisory: Red Hat JBoss Web Server 7.0.2 release and security update
RHSA-2026:76956 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat JBoss Web Server 7.0.2 release and security update
RHSA-2026:73981 Red Hat Product Security33 products fixed
Red Hat Security Advisory: Red Hat JBoss Web Server 6.2.5 release and security update
RHSA-2026:73982 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat JBoss Web Server 6.2.5 release and security update
RHSA-2026:63137 Red Hat Product Security21 products fixed
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

1 more advisory

Full record on NVD

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2026-08-25
Last Modified: 2026-08-26

Frequently asked questions

What is CVE-2026-65905?

Is CVE-2026-65905 actively exploited?

Active exploitation of CVE-2026-65905 has not been confirmed. Its EPSS score was 0.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-65905?

CVE-2026-65905 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Running tomcat? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this product CISA KEV additions, October 2026 Search CVEs

Already have an account? Open CVE WatchNo credit card required · No monthly cap on website lookups · 250 API requests/month

Go further

Following what attackers exploit right now? The CISA KEV additions of the month, with their patch deadlines.
Running this software? CVE Watch alerts you to new vulnerabilities in your products.

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database