GHSA-29M4-MX89-3MJG

Online Media Asset Handling (*.youtube and *.vimeo files) in the TYPO3 backend is vulnerable to denial of service. Putting large files with according file extensions results in high consumption of system resources. This can lead to exceeding limits of the current PHP process which results in a dysfunctional backend component. A valid backend user account or write access on the server system (e.g. SFTP) is needed in order to exploit this vulnerability.

The application allocates resources such as memory, threads, or file descriptors based on untrusted input without enforcing a cap. Typical impact: resource exhaustion leading to denial of service.

GHSA-29M4-MX89-3MJG has a CVSS score of 5.3 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (8.7.21, 9.5.2, 7.6.32); upgrading removes the vulnerable code path.

Kodem intelligence

1. What is GHSA-29M4-MX89-3MJG? GHSA-29M4-MX89-3MJG is a medium-severity allocation of resources without limits or throttling vulnerability in typo3/cms-core (composer), affecting versions >= 8.0.0, < 8.7.21. It is fixed in 8.7.21, 9.5.2, 7.6.32. The application allocates resources such as memory, threads, or file descriptors based on untrusted input without enforcing a cap.
2. How severe is GHSA-29M4-MX89-3MJG? GHSA-29M4-MX89-3MJG has a CVSS score of 5.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of typo3/cms-core are affected by GHSA-29M4-MX89-3MJG? typo3/cms-core (composer) versions >= 8.0.0, < 8.7.21 is affected.
4. Is there a fix for GHSA-29M4-MX89-3MJG? Yes. GHSA-29M4-MX89-3MJG is fixed in 8.7.21, 9.5.2, 7.6.32. Upgrade to this version or later.
5. Is GHSA-29M4-MX89-3MJG exploitable, and should I be worried? Whether GHSA-29M4-MX89-3MJG is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether GHSA-29M4-MX89-3MJG is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix GHSA-29M4-MX89-3MJG?
   • Upgrade typo3/cms-core to 8.7.21 or later
   • Upgrade typo3/cms-core to 9.5.2 or later
   • Upgrade typo3/cms-core to 7.6.32 or later

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