# Apache Tomcat Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability

Advisory record · `GHSA-27hp-xhwr-wr2m`

- **Identifiers:** `GHSA-27hp-xhwr-wr2m` · `BIT-tomcat-2024-56337` · `CVE-2024-56337`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-367](https://cwe.mitre.org/data/definitions/367.html)
- **Tags:** [Race condition](https://agentprime.io/advisories/tag/race-condition.md)
- **Published:** 20 Dec 2024
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 20 Dec 2024, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `org.apache.tomcat:tomcat-catalina` (Maven): affected `>=11.0.0-M1, <11.0.2 || >=10.1.0-M1, <10.1.34`; fixed in `11.0.2`, `10.1.34`
- `org.apache.tomcat:tomcat-embed-core` (Maven): affected `>=9.0.0.M1, <9.0.98`; fixed in `9.0.98`
- `org.apache.tomcat.embed:tomcat-embed-core` (Maven): affected `>=11.0.0-M1, <11.0.2 || >=10.1.0-M1, <10.1.34 || >=9.0.0.M1, <9.0.98`; fixed in `11.0.2`, `10.1.34`, `9.0.98`

## 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

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from ADP (CISA-ADP)

- **CISA KEV:** Not listed.
- **EPSS:** 0.090, the 95th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:17 UTC: First seen by agentprime
- 31 Oct 2026, 14:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-27hp-xhwr-wr2m)

## Sources

- [GitHub Advisory Database: GHSA-27hp-xhwr-wr2m](https://github.com/advisories/GHSA-27hp-xhwr-wr2m)
- [OSV: GHSA-27hp-xhwr-wr2m](https://osv.dev/vulnerability/GHSA-27hp-xhwr-wr2m)
- <https://nvd.nist.gov/vuln/detail/CVE-2024-56337>
- <https://github.com/apache/tomcat>
- <https://lists.apache.org/thread/b2b9qrgjrz1kvo4ym8y2wkfdvwoq6qbp>
- <https://lists.debian.org/debian-lts-announce/2025/01/msg00009.html>
- <https://security.netapp.com/advisory/ntap-20250103-0002>
- <https://tomcat.apache.org/security-10.html#Fixed_in_Apache_Tomcat_10.1.34>
- <https://tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.2>
- <https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.98>
- <https://www.cve.org/CVERecord?id=CVE-2024-50379>

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-27hp-xhwr-wr2m>, 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-27hp-xhwr-wr2m/>. Everything for agents: <https://agentprime.io/llms.txt>.