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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

7.2 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U · score source

EPSS

• CVE-2024-50379: 31.82% estimated exploitation activity in the next 30 days; percentile 98.30 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability during JSP compilation in Apache Tomcat permits an RCE on case insensitive file systems when the default servlet is enabled for write (non-default configuration). This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.1, from 10.1.0-M1 through 10.1.33, from 9.0.0.M1 through 9.0.97. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 though 8.5.100. Other, older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.2, 10.1.34 or 9.0.98, which fixes the issue.

Published by the source

17 Dec 2024, 15:31 UTC

Last modified by the source

3 Nov 2025, 21:31 UTC

Source last checked

26 Oct 2026, 16:40 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-5j33-cvvr-w245

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# Patch Next advisory brief: CVE-2024-50379

Advisory: Apache Tomcat Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability
IDs: CVE-2024-50379, GHSA-5j33-cvvr-w245
Record: https://patchnext.com/advisories/cve-2024-50379 (revision 1, source checked 26 Oct 2026, 16:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: org.apache.tomcat:tomcat-catalina 11.0.2, 10.1.34, 9.0.98; org.apache.tomcat.embed:tomcat-embed-core 11.0.2, 10.1.34, 9.0.98. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.apache.tomcat:tomcat-catalina: affected >= 11.0.0-M1, < 11.0.2; >= 10.1.0-M1, < 10.1.34; >= 9.0.0.M1, < 9.0.98; >= 8.5.0, <= 8.5.100; fixed in 9.0.98, 10.1.34, 11.0.2
- Maven org.apache.tomcat.embed:tomcat-embed-core: affected >= 11.0.0-M1, < 11.0.2; >= 10.1.0-M1, < 10.1.34; >= 9.0.0.M1, < 9.0.98; >= 8.5.0, <= 8.5.100; fixed in 9.0.98, 10.1.34, 11.0.2

## Suggested inspection (read-only)
- Maven org.apache.tomcat:tomcat-catalina: check the installed version with your package manager.
- Maven org.apache.tomcat.embed:tomcat-embed-core: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.apache.tomcat:tomcat-catalina, org.apache.tomcat.embed:tomcat-embed-core.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5j33-cvvr-w245 (GitHub-reviewed advisory GHSA-5j33-cvvr-w245 lists affected ranges: Maven org.apache.tomcat:tomcat-catalina >=11.0.0-M1 =10.1.0-M1 =9.0.0.M1 =8.5.0 =11.0.0-M1 =10.1.0-M1 =9.0.0.M1 =8.5.0 <=8.5.100)

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