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Apache Tomcat EUVDEUVD-2026-66128

| CVE-2026-65905 CRITICAL
Authentication Bypass by Capture-replay (CWE-294)
2026-08-25 security@apache.org GHSA-9xv2-5v5q-p794
Authentication Bypass Apache Red Hat Tomcat Suse
Critical
Disputed · 9.8 Vendor: apache
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Severity by source

Sources disagree (Medium–Critical)
Vendor (apache) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
4.8 MEDIUM

AC:H for the narrow nonceCount-boundary timing window plus a required capture position; PR:N as the attacker replays captured credentials; impact limited to a single unauthorized authenticated action, so C:L/I:L/A:N.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Red Hat
4.8 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: apache

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Aug 26, 2026 - 16:29 vuln.today
CVSS changed
Aug 26, 2026 - 16:22 NVD
9.8 (CRITICAL)
CVE Published
Aug 25, 2026 - 22:17 cve.org
CRITICAL 9.8
CVE Published
Aug 25, 2026 - 22:17 cve.org
UNKNOWN (no severity yet)

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 2 maven packages depend on org.apache.tomcat.embed:tomcat-embed-core (2 direct, 0 indirect)
  • 2 maven packages depend on org.apache.tomcat:tomcat-catalina (2 direct, 0 indirect)

Ecosystem-wide dependent count for version 11.0.0-M1 and other introduced versions.

DescriptionCVE.org

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.

AnalysisAI

Authentication bypass in Apache Tomcat's DIGEST authenticator lets a network attacker who has captured a valid DIGEST-authenticated request replay it once when its nonceCount sits on the upper boundary of the replay window and fewer than windowSize requests have since been made. It affects Tomcat 11.0.0-M1 through 11.0.24, 10.1.0-M1 through 10.1.57, 9.0.0.M1 through 9.0.120, plus EOL 8.5.x and 7.0.x branches, but only where DIGEST authentication is actually enabled. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Vulnerability AssessmentAI

Exploitation Requires the DIGEST authenticator to be explicitly configured on the Tomcat Realm (not the default) AND the attacker to already hold a captured, valid DIGEST-authenticated request. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals conflict sharply. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: upgrade to Apache Tomcat 11.0.25, 10.1.58, or 9.0.121, which fix the replay-window handling. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all systems running Tomcat 7.0.x, 8.5.x, 9.0.0 through 9.0.120, 10.1.0 through 10.1.57, or 11.0.0 through 11.0.24, and determine which have DIGEST authentication explicitly enabled. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected

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EUVD-2026-66128 vulnerability details – vuln.today
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