# CVE-2026-65905: Apache Tomcat: Limited replay attack possible with DIGEST authentication > Attackers can bypass DIGEST authentication via replay attacks in Apache Tomcat if specific nonce conditions are met, requiring an upgrade to secure the server. - **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 25 Aug 2026 - **Updated:** 26 Aug 2026 - **Also known as:** BIT-tomcat-2026-65905, DEBIAN-CVE-2026-65905, ECHO-566e-60a7-a73e, GHSA-9xv2-5v5q-p794, MINI-4hpm-m9hw-xqhq, MINI-69hp-3wj8-9p6c, MINI-9m27-xpw6-gvfq, MINI-f6p7-382h-fvwc, MINI-fvvj-r44m-c8h7, ROOT-APP-MAVEN-CVE-2026-65905, UBUNTU-CVE-2026-65905 ## What is CVE-2026-65905? CVE-2026-65905 is a critical authentication bypass vulnerability in Apache Tomcat, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official 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. Weakness: CWE-294 (Authentication Bypass by Capture-replay) ## Which versions are affected by CVE-2026-65905? 31 open source packages ship an affected version, including org.apache.tomcat.embed:tomcat-embed-core, tomcat and org.apache.tomcat:tomcat. It affects 1 product. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `org.apache.tomcat.embed:tomcat-embed-core` | Maven | From 10.1.0-M1 | 10.1.58 | | `org.apache.tomcat.embed:tomcat-embed-core` | Maven | From 10.1.0-M1 | 10.1.58 | | `org.apache.tomcat.embed:tomcat-embed-core` | Maven | From 11.0.0-M1 | 11.0.25 | | `org.apache.tomcat.embed:tomcat-embed-core` | Maven | From 11.0.0-M1 | 11.0.25 | | `org.apache.tomcat.embed:tomcat-embed-core` | Maven | From 7.0.30 to 7.0.109 | None | | `org.apache.tomcat.embed:tomcat-embed-core` | Maven | From 7.0.30 to 7.0.109 | None | | `org.apache.tomcat.embed:tomcat-embed-core` | Maven | From 8.5.0 to 8.5.100 | None | | `org.apache.tomcat.embed:tomcat-embed-core` | Maven | From 8.5.0 to 8.5.100 | None | | `org.apache.tomcat.embed:tomcat-embed-core` | Maven | From 9.0.0.M1 | 9.0.121 | | `org.apache.tomcat.embed:tomcat-embed-core` | Maven | From 9.0.0.M1 | 9.0.121 | | `tomcat` | Bitnami | From 7.0.30 | 9.0.121, 10.1.58, 11.0.25 | | `org.apache.tomcat:tomcat` | Maven | From 10.1.0-M1 | 10.1.58 | | `org.apache.tomcat:tomcat` | Maven | From 10.1.0-M1 | 10.1.58 | | `org.apache.tomcat:tomcat` | Maven | From 11.0.0-M1 | 11.0.25 | | `org.apache.tomcat:tomcat` | Maven | From 11.0.0-M1 | 11.0.25 | | `org.apache.tomcat:tomcat` | Maven | From 7.0.30 to 7.0.109 | None | | `org.apache.tomcat:tomcat` | Maven | From 7.0.30 to 7.0.109 | None | | `org.apache.tomcat:tomcat` | Maven | From 8.5.0 to 8.5.100 | None | | `org.apache.tomcat:tomcat` | Maven | From 8.5.0 to 8.5.100 | None | | `org.apache.tomcat:tomcat` | Maven | From 9.0.0.M1 | 9.0.121 | | `org.apache.tomcat:tomcat` | Maven | From 9.0.0.M1 | 9.0.121 | | `org.apache.tomcat:tomcat-catalina` | Maven | From 10.1.0-M1 | 10.1.58 | | `org.apache.tomcat:tomcat-catalina` | Maven | From 10.1.0-M1 | 10.1.58 | | `org.apache.tomcat:tomcat-catalina` | Maven | From 11.0.0-M1 | 11.0.25 | | `org.apache.tomcat:tomcat-catalina` | Maven | From 11.0.0-M1 | 11.0.25 | | `org.apache.tomcat:tomcat-catalina` | Maven | From 7.0.30 to 7.0.109 | None | | `org.apache.tomcat:tomcat-catalina` | Maven | From 7.0.30 to 7.0.109 | None | | `org.apache.tomcat:tomcat-catalina` | Maven | From 8.5.0 to 8.5.100 | None | | `org.apache.tomcat:tomcat-catalina` | Maven | From 8.5.0 to 8.5.100 | None | | `org.apache.tomcat:tomcat-catalina` | Maven | From 9.0.0.M1 | 9.0.121 | | `org.apache.tomcat:tomcat-catalina` | Maven | From 9.0.0.M1 | 9.0.121 | Products: Apache Tomcat. ## How do I fix CVE-2026-65905? Upgrade org.apache.tomcat.embed:tomcat-embed-core to a fixed version for your release line: 10.1.58, 11.0.25 or 9.0.121. ## Is CVE-2026-65905 being exploited? There is no known exploitation of CVE-2026-65905 in the wild and no public exploit code. ## Other vulnerabilities in Apache Tomcat - [CVE-2025-24813](https://insights.sbomify.com/CVE-2025-24813/): Apache Tomcat Path Equivalence (critical 10.0, exploited in the wild) - [CVE-2016-8735](https://insights.sbomify.com/CVE-2016-8735/): Apache Tomcat Remote Code Execution (critical 9.8, exploited in the wild) - [CVE-2017-12617](https://insights.sbomify.com/CVE-2017-12617/): Apache Tomcat Remote Code Execution (high 8.1, exploited in the wild) - [CVE-2017-12615](https://insights.sbomify.com/CVE-2017-12615/): Apache Tomcat on Windows Remote Code Execution (high 8.1, exploited in the wild) - [CVE-2026-34486](https://insights.sbomify.com/CVE-2026-34486/): Apache Tomcat Missing Encryption of Sensitive Data (high 7.5, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-65905 and fix it if it is affected. What it is: CVE-2026-65905 is a critical authentication bypass vulnerability in Apache Tomcat, published on 25 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2026-65905 in the wild and no public exploit code. Affected packages and fixed versions: - org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 10.1.0-M1; fixed in 10.1.58 - org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 10.1.0-M1; fixed in 10.1.58 - org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 11.0.0-M1; fixed in 11.0.25 - org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 11.0.0-M1; fixed in 11.0.25 - org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 7.0.30 up to 7.0.109; no fix listed - org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 7.0.30 up to 7.0.109; no fix listed - org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 8.5.0 up to 8.5.100; no fix listed - org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 8.5.0 up to 8.5.100; no fix listed - org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 9.0.0.M1; fixed in 9.0.121 - org.apache.tomcat.embed:tomcat-embed-core (Maven): affected from 9.0.0.M1; fixed in 9.0.121 - tomcat (Bitnami): affected from 7.0.30; fixed in 9.0.121, 10.1.58, 11.0.25 - org.apache.tomcat:tomcat (Maven): affected from 10.1.0-M1; fixed in 10.1.58 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-65905/ (Markdown: https://insights.sbomify.com/CVE-2026-65905/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-65905 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-65905 - OSV: https://osv.dev/vulnerability/CVE-2026-65905 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-65905/ Summaries are generated and may contain mistakes; the official description above is the record.