What is CVE-2026-46349?

CVE-2026-46349 is a medium-severity vulnerability in Mastodon, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.3/10. Published 2026-06-24.

How severe is CVE-2026-46349?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Mastodon

CVE-2026-46349

Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.5.10, 4.4.17, and 4.3.23, Mastodon's normalization of incoming activities signed with Linked-Data Signatures does not sufficiently protect the activitie…

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Mastodon — versions >= 4.5.0-beta.1, < 4.5.10

Weakness classification (CWE)

CWE-347 — Improper Verification of Cryptographic Signature

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-46349?: CVE-2026-46349 is a medium-severity vulnerability in Mastodon, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.3/10. Published 2026-06-24.
How severe is CVE-2026-46349?: Medium severity. CVSS v3 base score is 5.3 out of 10.