Nixpkgs security tracker

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Permalink CVE-2026-72916

6.3 MEDIUM

CVSS version (CVSS): 4.0
Attack Vector (AV): Network (N)
Attack Complexity (AC): High (H)
Attack Requirement (AT): Present (P)
Privileges Required (PR): None (N)
User Interaction (UI): None (N)
Vulnerable System Impact Confidentiality (VC): None (N)
Vulnerable System Impact Integrity (VI): None (N)
Vulnerable System Impact Availability (VA): None (N)
Subsequent System Impact Confidentiality (SC): Low (L)
Subsequent System Impact Integrity (SI): Low (L)
Subsequent System Impact Availability (SA): Low (L)
Modified Attack Vector (MAV): Network (N)
Modified Attack Complexity (MAC): High (H)
Modified Attack Requirement (MAT): Present (P)
Modified Privileges Required (MPR): None (N)
Modified User Interaction (MUI): None (N)
Modified Vulnerable System Impact Confidentiality (MVC): None (N)
Modified Vulnerable System Impact Integrity (MVI): None (N)
Modified Vulnerable System Impact Availability (MVA): None (N)
Modified Subsequent System Impact Confidentiality (MSC): Low (L)
Modified Subsequent System Impact Integrity (MSI): Low (L)
Modified Subsequent System Impact Availability (MSA): Low (L)
Safety (S): Not Defined (X)
Automatable (AU): Not Defined (X)
Recovery (R): Not Defined (X)
Value Density (V): Not Defined (X)
Vulnerability Response Effort (RE): Not Defined (X)
Provider Urgency (U): Not Defined (X)
Confidentiality Req. (CR): Not Defined (X)
Integrity Req. (IR): Not Defined (X)
Availability Req. (AR): Not Defined (X)
Exploit Maturity (E): Not Defined (X)

updated 1 month, 1 week ago by @erictapen Activity log

Created suggestion 1 month, 1 week ago
@erictapen ignored
5 packages
- bitlbee-mastodon
- mastodon-archive
- python313Packages.mastodon-py
- python314Packages.mastodon-py
- wordpressPackages.plugins.simple-mastodon-verification
1 month, 1 week ago
@erictapen dismissed 1 month, 1 week ago

Mastodon: SSRF Protection Bypass via IPv4-compatible IPv6 Addresses

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-beta.1, 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-beta.1.

References

https://github.com/mastodon/mastodon/security/advisories/GHSA-vwhj-3g83-v276 x_refsource_CONFIRM
https://github.com/mastodon/mastodon/commit/18c61f286f1f5718a8f517940ba384866ffa3892 x_refsource_MISC
https://github.com/mastodon/mastodon/commit/467c933459c7d0e5513475b9e4888afaedfb1074 x_refsource_MISC
https://github.com/mastodon/mastodon/commit/930aa9fee26bf9eaefe27826fa1061288d83373b x_refsource_MISC
https://github.com/mastodon/mastodon/commit/da47a1bd3cd07935d7ca55a1f4f1a76f7f167e0d x_refsource_MISC
https://github.com/mastodon/mastodon/releases/tag/v4.4.21 x_refsource_MISC
https://github.com/mastodon/mastodon/releases/tag/v4.5.14 x_refsource_MISC
https://github.com/mastodon/mastodon/releases/tag/v4.6.4 x_refsource_MISC
https://github.com/mastodon/mastodon/releases/tag/v4.7.0-beta.1 x_refsource_MISC

Affected products

mastodon

==< 4.4.21
==>= 4.6.0-beta.1, < 4.6.4
==>= 4.5.0-beta.1, < 4.5.14

Matching in nixpkgs

pkgs.mastodon

Self-hosted, globally interconnected microblogging software based on ActivityPub

nixos-unstable 4.6.2
- nixpkgs-unstable 4.6.2
- nixos-unstable-small 4.6.5
nixos-26.05 4.6.2
- nixos-26.05-small 4.6.5
- nixpkgs-26.05-darwin 4.6.2

Ignored packages (5)

pkgs.bitlbee-mastodon

Bitlbee plugin for Mastodon

nixos-unstable 1.4.5
- nixpkgs-unstable 1.4.5
- nixos-unstable-small 1.4.5
nixos-26.05 1.4.5
- nixos-26.05-small 1.4.5
- nixpkgs-26.05-darwin 1.4.5

pkgs.mastodon-archive

Utility for backing up your Mastodon content

nixos-unstable 1.4.8
- nixpkgs-unstable 1.4.8
- nixos-unstable-small 1.4.8
nixos-26.05 1.4.8
- nixos-26.05-small 1.4.8
- nixpkgs-26.05-darwin 1.4.8

pkgs.python313Packages.mastodon-py

Python wrapper for the Mastodon API

nixos-unstable 2.2.1
- nixpkgs-unstable 2.2.1
- nixos-unstable-small 2.2.2
nixos-26.05 2.2.1
- nixos-26.05-small 2.2.1
- nixpkgs-26.05-darwin 2.2.1

pkgs.python314Packages.mastodon-py