Mastodon vulnerabilities: known CVEs & security history
Mastodon · Comms / Social · 5 tracked CVEs · 0 actively exploited · updated November 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Mastodon release lines — 5 in total. A CVE here doesn't mean your version is affected — check Mastodon's current status and the safe version to run.
Known Mastodon CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2025-62605 | medium | 4.3 | 0% | 2025 |
| CVE-2025-62176 | medium | 4.3 | 0% | 2025 |
| CVE-2025-62175 | medium | 4.3 | 0% | 2025 |
| CVE-2025-67500 | low | 3.7 | 0% | 2025 |
| CVE-2025-62174 | low | 3.5 | 0% | 2025 |
Is my Mastodon version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Mastodon version → · Monitor Mastodon for new CVEs →
Mastodon vulnerabilities — frequently asked
How many known vulnerabilities does Mastodon have?
IsItPatched tracks 5 CVEs for Mastodon. 0 are critical-severity and 0 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Mastodon have any actively-exploited vulnerabilities?
None of Mastodon's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe Mastodon vulnerability?
Among tracked issues, CVE-2025-62605 (MEDIUM, CVSS 4.3) ranks highest — a CWE-754 weakness.
Is Mastodon safe to use?
It depends on the version. The latest supported Mastodon release (4.7.3) clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Mastodon security status · Mastodon end-of-life · actively-exploited CVEs. Always verify against Mastodon's advisories — see our disclaimer.