What’s Vulnerable › Vulnerabilities

CVE-2024-52791: Denial of service through memory exhaustion in Matrix Media Repo

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-01-16 · updated 2026-06-17
• Weakness: CWE-789

Description

Matrix Media Repo (MMR) is a highly configurable multi-homeserver media repository for Matrix. MMR makes requests to other servers as part of normal operation, and these resource owners can return large amounts of JSON back to MMR for parsing. In parsing, MMR can consume large amounts of memory and exhaust available memory. This is fixed in MMR v1.3.8. Users are advised to upgrade. For users unable to upgrade; forward proxies can be configured to block requests to unsafe hosts. Alternatively, MMR processes can be configured with memory limits and auto-restart. Running multiple MMR processes concurrently can help ensure a restart does not overly impact users.

Affected products

• t2bot matrix-media-repo: before 1.3.8 — fixed in 1.3.8

How to fix

Upgrade to a fixed version: t2bot matrix-media-repo 1.3.8. Check the vendor advisory for mitigations.

References

• https://github.com/t2bot/matrix-media-repo/releases/tag/v1.3.8
• https://github.com/t2bot/matrix-media-repo/security/advisories/GHSA-gp86-q8hg-fpxj

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