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Untriaged

Permalink CVE-2026-34933

5.5 MEDIUM

CVSS version (CVSS): 3.1
Attack Vector (AV): Local (L)
Attack Complexity (AC): Low (L)
Privileges Required (PR): Low (L)
User Interaction (UI): None (N)
Scope (S): Unchanged (U)
Confidentiality (C): None (N)
Integrity (I): None (N)
Availability (A): High (H)
Modified Attack Vector (MAV): Local (L)
Modified Attack Complexity (MAC): Low (L)
Modified Privileges Required (MPR): Low (L)
Modified User Interaction (MUI): None (N)
Modified Confidentiality (MC): None (N)
Modified Scope (MS): Unchanged (U)
Modified Integrity (MI): None (N)
Modified Availability (MA): High (H)

created 1 month, 3 weeks ago Activity log

Created suggestion 1 month, 3 weeks ago

Avahi: Reachable assertion in `transport_flags_from_domain()` via conflicting publish flags crashes avahi-daemon

Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. Prior to version 0.9-rc4, any unprivileged local user can crash avahi-daemon by sending a single D-Bus method call with conflicting publish flags. This issue has been patched in version 0.9-rc4.

References

https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc x_refsource_CONFIRM
https://github.com/avahi/avahi/pull/891 x_refsource_MISC
https://github.com/avahi/avahi/commit/625ca0fac19229f6dfa3a6c6b698ae657187e50c x_refsource_MISC

Affected products

avahi

==< 0.9-rc4

Matching in nixpkgs

pkgs.avahi

mDNS/DNS-SD implementation

nixos-unstable 0.8
- nixpkgs-unstable 0.8
- nixos-unstable-small 0.8
nixos-25.11 0.8
- nixos-25.11-small 0.8
- nixpkgs-25.11-darwin 0.8

pkgs.guile-avahi

Bindings to Avahi for GNU Guile

nixos-unstable 0.4.1
- nixpkgs-unstable 0.4.1
- nixos-unstable-small 0.4.1
nixos-25.11 0.4.1
- nixos-25.11-small 0.4.1
- nixpkgs-25.11-darwin 0.4.1

pkgs.avahi-compat

mDNS/DNS-SD implementation

nixos-unstable 0.8
- nixpkgs-unstable 0.8
- nixos-unstable-small 0.8
nixos-25.11 0.8
- nixos-25.11-small 0.8
- nixpkgs-25.11-darwin 0.8

pkgs.haskellPackages.avahi

Minimal DBus bindings for Avahi daemon (http://avahi.org)

nixos-unstable 0.2.0
- nixpkgs-unstable 0.2.0
- nixos-unstable-small 0.2.0
nixos-25.11 0.2.0
- nixos-25.11-small 0.2.0
- nixpkgs-25.11-darwin 0.2.0

pkgs.python312Packages.avahi

mDNS/DNS-SD implementation

nixos-25.11 0.8
- nixos-25.11-small 0.8
- nixpkgs-25.11-darwin 0.8

pkgs.python313Packages.avahi

mDNS/DNS-SD implementation

nixos-unstable 0.8
- nixpkgs-unstable 0.8
- nixos-unstable-small 0.8
nixos-25.11 0.8
- nixos-25.11-small 0.8
- nixpkgs-25.11-darwin 0.8

pkgs.python314Packages.avahi

mDNS/DNS-SD implementation

nixos-unstable 0.8
- nixpkgs-unstable 0.8
- nixos-unstable-small 0.8

Package maintainers

@globin Robin Gloster <mail@glob.in>
@lovek323 Jason O'Conal <jason@oconal.id.au>
@foo-dogsquared Gabriel Arazas <foodogsquared@foodogsquared.one>

Untriaged

Permalink CVE-2026-24401

6.5 MEDIUM

CVSS version (CVSS): 3.1
Attack Vector (AV): Network (N)
Attack Complexity (AC): Low (L)
Privileges Required (PR): None (N)
User Interaction (UI): Required (R)
Scope (S): Unchanged (U)
Confidentiality (C): None (N)
Integrity (I): None (N)
Availability (A): High (H)
Modified Attack Vector (MAV): Network (N)
Modified Attack Complexity (MAC): Low (L)
Modified Privileges Required (MPR): None (N)
Modified User Interaction (MUI): Required (R)
Modified Confidentiality (MC): None (N)
Modified Scope (MS): Unchanged (U)
Modified Integrity (MI): None (N)
Modified Availability (MA): High (H)

created 4 months ago Activity log

Created suggestion 4 months ago

Avahi has Uncontrolled Recursion in lookup_handle_cname function

Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions 0.9rc2 and below, avahi-daemon can be crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the alias and canonical name point to the same domain (e.g., "h.local" as a CNAME for "h.local"). This causes unbounded recursion in the lookup_handle_cname function, leading to stack exhaustion. The vulnerability affects record browsers where AVAHI_LOOKUP_USE_MULTICAST is set explicitly, which includes record browsers created by resolvers used by nss-mdns. This issue is patched in commit 78eab31128479f06e30beb8c1cbf99dd921e2524.