BIT-mastodon-2026-72916

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Import Source
https://github.com/bitnami/vulndb/tree/main/data/mastodon/BIT-mastodon-2026-72916.json
JSON Data
https://api.osv.dev/v1/vulns/BIT-mastodon-2026-72916
Aliases
Published
2026-08-17T05:46:39Z
Modified
2026-08-17T08:10:42Z
Summary
Mastodon: SSRF Protection Bypass via IPv4-compatible IPv6 Addresses
Details

Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.4.21, 4.5.14, 4.6.4, and 4.7.0, PrivateAddressCheck.private_address? in app/lib/private_address_check.rb normalized IPv4-mapped IPv6 addresses but did not recognize IPv4-compatible IPv6 addresses with IPAddr#ipv4_compat?. An attacker could supply an address in the omitted range to bypass the ALLOWED_PRIVATE_ADDRESSES protection and make Mastodon send HTTP requests to loopback interfaces, potentially accessing private resources and services. Exploitation requires a system that supports the obsolete IPv4-compatible IPv6 mechanism. This issue is fixed in versions 4.4.21, 4.5.14, 4.6.4, and 4.7.0.

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

Affected packages

Bitnami / mastodon

Package

Name
mastodon
Purl
pkg:bitnami/mastodon

Severity

  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L/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
0 Unknown introduced version / All previous versions are affected
Fixed
4.4.21
Introduced
4.5.0
Fixed
4.5.14
Introduced
4.6.0
Fixed
4.6.4

Database specific

source 
"https://github.com/bitnami/vulndb/tree/main/data/mastodon/BIT-mastodon-2026-72916.json"