# Apache Tomcat has an HTTP Request/Response Smuggling vulnerability

Advisory record · `GHSA-563x-q5rq-57qp`

- **Identifiers:** `GHSA-563x-q5rq-57qp` · `BIT-tomcat-2026-24880` · `CVE-2026-24880`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **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:** 9 Apr 2026
- **Updated:** 11 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 9 Apr 2026, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.apache.tomcat:tomcat-coyote` (Maven): affected `>=7.0.0, <9.0.116 || >=10.1.0-M1, <10.1.52 || >=11.0.0-M1, <11.0.20`; fixed in `9.0.116`, `10.1.52`, `11.0.20`
- `org.apache.tomcat.embed:tomcat-embed-core` (Maven): affected `>=7.0.0, <9.0.116 || >=10.1.0-M1, <10.1.52 || >=11.0.0-M1, <11.0.20`; fixed in `9.0.116`, `10.1.52`, `11.0.20`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Apache Tomcat (tomcat-coyote and tomcat-embed-core, Maven) is vulnerable to HTTP request smuggling through an invalid chunk extension in affected versions 7.0.0 through 9.0.115, 10.1.0-M1 through 10.1.52 and 11.0.0-M1 through 11.0.18, per the affected version ranges listed. The source does not describe the attacker's position or the exact impact beyond the smuggling class. Upgrade to 9.0.116, 10.1.52, 11.0.20 or a later fixed release.

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:** 0.0070, the 53rd 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-563x-q5rq-57qp)

## Sources

- [GitHub Advisory Database: GHSA-563x-q5rq-57qp](https://github.com/advisories/GHSA-563x-q5rq-57qp)
- [OSV: GHSA-563x-q5rq-57qp](https://osv.dev/vulnerability/GHSA-563x-q5rq-57qp)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-24880>
- <https://github.com/apache/tomcat/commit/1b586d6aa8ae65726da5fa8799427b5d4718478a>
- <https://github.com/apache/tomcat/commit/1e71441a15972f56e661b0b549fb9e5d838b83bb>
- <https://github.com/apache/tomcat/commit/2cb06c34f661ca42f7570bbcc21e99806184bcc5>
- <https://github.com/apache/tomcat/commit/6d478dbe18b7c4bb671c30fedf130309b0dab77c>
- <https://github.com/apache/tomcat/commit/f07df938d00f7419b40fa65aa912966d0efac522>
- <https://github.com/apache/tomcat/commit/fde1a8235fb73125217bd41e162aa0a113f33552>
- <https://github.com/apache/tomcat>
- <https://lists.apache.org/thread/2c682qnlg2tv4o5knlggqbl9yc2gb5sn>
- <https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.53>
- <https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.20>
- <https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.116>

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 (<https://api.agentprime.io/mcp>), 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: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-563x-q5rq-57qp>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-563x-q5rq-57qp/>. Everything for agents: <https://agentprime.io/llms.txt>.