CVE-2026-65905Network attack vectorHinoki check available

One-time request replay via premature slot clearing

Published Aug 25, 2026 · Updated Aug 25, 2026

Capture-replay in Apache Tomcat's DIGEST authenticator allows remote attackers to repeat one authenticated request. DigestAuthenticator.NonceInfo clears the slot for count modulo windowSize before incrementing count, marking an upper-bound nonceCount unseen again. The gate is a captured valid DIGEST request sent at the replay window's upper boundary before windowSize requests, and only one replay succeeds while that count remains in the window.

CVSS severity9.8
Critical
EPSS probability0.77%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Capture-replay in Apache Tomcat's DIGEST authenticator allows remote attackers to repeat one authenticated request. DigestAuthenticator.NonceInfo clears the slot for count modulo windowSize before incrementing count, marking an upper-bound nonceCount unseen again. The gate is a captured valid DIGEST request sent at the replay window's upper boundary before windowSize requests, and only one replay succeeds while that count remains in the window.

The record

CVE
CVE-2026-65905
Published
Aug 25, 2026
Updated
Aug 25, 2026
Vendor
The Apache Software Foundation
Product
Apache Tomcat
Classifications
CWE-294, T1550
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1.0-M1 <=10.1.57
  2. Affected versionversion=11.0.0-M1 <=11.0.24
  3. Affected versionversion=7.0.30 <=7.0.109
  4. Affected versionversion=8.5.0 <=8.5.100
  5. Affected versionversion=9.0.0.M1 <=9.0.120

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Tomcatversion=10.1.0-M1 <=10.1.57; version=11.0.0-M1 <=11.0.24; version=7.0.30 <=7.0.109; version=8.5.0 <=8.5.100; version=9.0.0.M1 <=9.0.120

Published CVSS scores

9.8CISA CoordinatorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-294Authentication Bypass by Capture-replay
T1550Use Alternate Authentication Material

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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