# Apache Tomcat Improper Input Validation vulnerability Advisory record · `GHSA-fccv-jmmp-qg76` - **Identifiers:** `GHSA-fccv-jmmp-qg76` · `BIT-tomcat-2023-46589` · `CVE-2023-46589` - **State:** Confirmed - **Severity:** CVSS 7.5 High - **Critical:** No - **Weakness (CWE):** [CWE-20](https://cwe.mitre.org/data/definitions/20.html) · [CWE-444](https://cwe.mitre.org/data/definitions/444.html) - **Tags:** [HTTP request smuggling](https://agentprime.io/advisories/tag/request-smuggling.md) · [CWE-20](https://agentprime.io/advisories/tag/cwe-20.md) - **Published:** 28 Nov 2023 - **Updated:** 2 Oct 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 28 Nov 2023, 18:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `org.apache.tomcat:tomcat-catalina` (Maven): affected `>=11.0.0-M1, <11.0.0-M11 || >=10.1.0-M1, <10.1.16 || >=9.0.0-M1, <9.0.83 || >=8.5.0, <8.5.96`; fixed in `11.0.0-M11`, `10.1.16`, `9.0.83`, `8.5.96` - `org.apache.tomcat.embed:tomcat-embed-core` (Maven): affected `>=11.0.0-M1, <11.0.0-M11 || >=10.1.0-M1, <10.1.16 || >=9.0.0-M1, <9.0.83 || >=8.5.0, <8.5.96`; fixed in `11.0.0-M11`, `10.1.16`, `9.0.83`, `8.5.96` - `org.apache.tomcat:tomcat-coyote` (Maven): affected `>=11.0.0-M1, <11.0.0-M11`; fixed in `11.0.0-M11` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Apache Tomcat versions 11.0.0-M1 through 11.0.0-M10, 10.1.0-M1 through 10.1.15, 9.0.0-M1 through 9.0.82, and 8.5.0 through 8.5.95 are affected, along with the tomcat-catalina, tomcat-embed-core and tomcat-coyote packages. A trailer header larger than the size limit can cause one request to be treated as several, enabling request smuggling when Tomcat sits behind a reverse proxy. Upgrade to 11.0.0-M11, 10.1.16, 9.0.83 or 8.5.96 or later, which fix the issue. Older, end-of-life versions may also be affected and have no fix listed. Written 2 Nov 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N`, from GitHub Advisory Database - **CISA KEV:** Not listed. - **EPSS:** 0.027, the 85th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 14:16 UTC: First seen by agentprime - 31 Oct 2026, 14:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-fccv-jmmp-qg76) ## Sources - [GitHub Advisory Database: GHSA-fccv-jmmp-qg76](https://github.com/advisories/GHSA-fccv-jmmp-qg76) - [OSV: GHSA-fccv-jmmp-qg76](https://osv.dev/vulnerability/GHSA-fccv-jmmp-qg76) - - - - - - - - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .