# Potential HTTP request smuggling in Apache Tomcat Advisory record · `GHSA-qxf4-chvg-4r8r` - **Identifiers:** `GHSA-qxf4-chvg-4r8r` · `BIT-tomcat-2020-1935` · `CVE-2020-1935` - **State:** Confirmed - **Severity:** CVSS 4.8 Medium - **Critical:** No - **Weakness (CWE):** [CWE-444](https://cwe.mitre.org/data/definitions/444.html) - **Tags:** [HTTP request smuggling](https://agentprime.io/advisories/tag/request-smuggling.md) - **Published:** 28 Feb 2020 - **Updated:** 7 Aug 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 28 Feb 2020, 01:10 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `org.apache.tomcat.embed:tomcat-embed-core` (Maven): affected `<7.0.100 || >=8.0.0, <8.5.51 || >=9.0.0, <9.0.31`; fixed in `7.0.100`, `8.5.51`, `9.0.31` - `org.apache.tomcat:tomcat` (Maven): affected `<7.0.100 || >=8.0.0, <8.5.51 || >=9.0.0, <9.0.31`; fixed in `7.0.100`, `8.5.51`, `9.0.31` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Apache Tomcat versions 7.0.0 to 7.0.99, 8.5.0 to 8.5.50, and 9.0.0.M1 to 9.0.30 (packages tomcat-embed-core and tomcat) parse some invalid HTTP headers as valid due to how end-of-line is handled. An attacker could exploit this to smuggle requests, but only when Tomcat sits behind a reverse proxy that mishandles the invalid Transfer-Encoding header in a specific way, which the source considers unlikely. Upgrade to 7.0.100, 8.5.51, 9.0.31 or later. 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 - 4.8 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N`, from GitHub Advisory Database - **CISA KEV:** Not listed. - **EPSS:** 0.094, the 95th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 14:19 UTC: First seen by agentprime - 31 Oct 2026, 14:19 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-qxf4-chvg-4r8r) ## Sources - [GitHub Advisory Database: GHSA-qxf4-chvg-4r8r](https://github.com/advisories/GHSA-qxf4-chvg-4r8r) - [OSV: GHSA-qxf4-chvg-4r8r](https://osv.dev/vulnerability/GHSA-qxf4-chvg-4r8r) - - - - - - - - - - - - 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: .