CVE-2026-46349

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-46349
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46349.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-46349
Aliases
Published
2026-06-24T19:40:35.022Z
Modified
2026-07-15T01:49:07.102473282Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
Summary
Mastodon: LD-Signature Bypass via JSON-LD Named-Graph Restructuring
Details

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 activities from a certain class of spoofing, allowing attackers to re-arrange a valid signed JSON-LD activity from a third-party actor to have it processed differently. This vulnerability is fixed in 4.5.10, 4.4.17, and 4.3.23.

Database specific 
{
    "cwe_ids": [
        "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46349.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/mastodon/mastodon

Affected ranges

Type
GIT
Repo
https://github.com/mastodon/mastodon
Events
Introduced
5a8ab0a3e62a8825e28bb74c1760ba6488d20c97
Fixed
f80b1ba92e63c3da771b405b9100f5c9abda909f
Database specific 
{
    "extracted_events": [
        {
            "introduced": "4.5.0-beta.1"
        },
        {
            "fixed": "4.5.10"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

v4.*
v4.5.0
v4.5.0-beta.1
v4.5.0-beta.2
v4.5.0-rc.1
v4.5.0-rc.2
v4.5.0-rc.3
v4.5.1
v4.5.2
v4.5.3
v4.5.4
v4.5.5
v4.5.6
v4.5.7
v4.5.8
v4.5.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46349.json"