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CVE-2026-65905 critical CVSS 9.8

Vulnerability in org.apache.tomcat:tomcat (CVE-2026-65905)

Summary

Vulnerability in org.apache.tomcat:tomcat (CVE-2026-65905). Successful exploitation can lead to full system takeover.

Original description

The description as published by the source.

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 through 11.0.24, from 10.1.0 through 10.1.57, from 9.0.0 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.

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-65905 has been found in org.apache.tomcat:tomcat.
Successful exploitation can lead to full system takeover. CVSS score: 9.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "org.apache.tomcat:tomcat CVE-2026-65905" on the vendor's site.

CVE-2026-65905 (org.apache.tomcat:tomcat) — CWE-294 / CVSS v3 9.8
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-294) exists in org.apache.tomcat:tomcat.

📍 Affected scope

Check the vendor advisory for the affected versions of org.apache.tomcat:tomcat.

🔥 Severity

Severity: Critical (CVSS 9.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで org.apache.tomcat:tomcat を使っているサービスとバージョンを洗い出す。

  2. 2
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

maven org.apache.tomcat:tomcat
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
maven org.apache.tomcat.embed:tomcat-embed-core
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
maven org.apache.tomcat:tomcat-catalina
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Bitnami tomcat
[{"type":"SEMVER","events":[{"introduced":"7.0.30"},{"fixed":"9.0.121"},{"introduced":"10.0.0"},{"fixed":"10.1.58"},{"introduced":"11.0.0"},{"fixed":"11.0.25"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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