#VU126978 Allocation of Resources Without Limits or Throttling in Mastodon - CVE-2025-27157
Published: February 27, 2025 / Updated: April 23, 2026
Vulnerability identifier: #VU126978
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-27157
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mastodon
Mastodon
Software vendor:
Mastodon
Mastodon
Description
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 the sign-up email verification feature when handling requests to change or re-request email verification during the sign-up flow. A remote attacker can send crafted requests to cause a denial of service.
The issue can be abused to send email messages to arbitrary addresses.
Remediation
Install security update from vendor's website.