Allocation of Resources Without Limits or Throttling in Mastodon - #VU139923
Published: July 28, 2026
Vulnerability identifier: #VU139923
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to allocation of resources without limits or throttling in statistics endpoints when handling anonymous requests. A remote attacker can issue potentially expensive requests to cause a denial of service.
The affected endpoints check permissions before returning results, but not before computing them, which can trigger expensive long-running SQL queries.
Affected software
Mastodon
Remediation
Install security update from vendor's website.
Mastodon - addressed in versions 4.4.21, 4.5.14, 4.6.4