BIT-mastodon-2026-22245

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Import Source
https://github.com/bitnami/vulndb/tree/main/data/mastodon/BIT-mastodon-2026-22245.json
JSON Data
https://api.osv.dev/v1/vulns/BIT-mastodon-2026-22245
Aliases
Published
2026-01-13T11:27:28.319Z
Modified
2026-01-13T12:11:09.635840Z
Summary
Mastodon has SSRF Protection bypass
Details

Mastodon is a free, open-source social network server based on ActivityPub. By nature, Mastodon performs a lot of outbound requests to user-provided domains. Mastodon, however, has some protection mechanism to disallow requests to local IP addresses (unless specified in ALLOWED_PRIVATE_ADDRESSES) to avoid the "confused deputy" problem. The list of disallowed IP address ranges was lacking some IP address ranges that can be used to reach local IP addresses. An attacker can use an IP address in the affected ranges to make Mastodon perform HTTP requests against loopback or local network hosts, potentially allowing access to otherwise private resources and services. This is fixed in Mastodon v4.5.4, v4.4.11, v4.3.17 and v4.2.29.

Database specific 
{
    "severity": "High",
    "cpes": [
        "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*"
    ]
}
References

Affected packages

Bitnami / mastodon

Package

Name
mastodon
Purl
pkg:bitnami/mastodon

Severity

  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.2.29
Introduced
4.3.0
Fixed
4.3.17
Introduced
4.4.0
Fixed
4.4.11
Introduced
4.5.0
Fixed
4.5.4

Database specific

source

"https://github.com/bitnami/vulndb/tree/main/data/mastodon/BIT-mastodon-2026-22245.json"