CVE catalog

CVE-2025-59529

avahi: CVE-2025-59529

Severity: Medium · CVSS 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: Dec 11, 2025, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.22% · Oct 25, 2026

Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions up to and including 0.9-rc2, the simple protocol server ignores the documented client limit and accepts unlimited connections, allowing for easy local DoS. Although `CLIENTS_MAX` is defined, `server_work()` unconditionally `accept()`s and `client_new()` always appends the new client and increments `n_clients`. There is no check against the limit. When client cannot be accepted as a result of maximal socket number of avahi-daemon, it logs unconditionally error per each connection. Unprivileged local users can exhaust daemon memory and file descriptors, causing a denial of service system-wide for mDNS/DNS-SD. Exhausting local file descriptors causes increased system load caused by logging errors of each of request. Overloading prevents glibc calls using nss-mdns plugins to resolve `*.local.` names and link-local addresses. As of time of publication, no known patched versions are available, but a candidate fix is available in pull request 808, and some workarounds are available. Simple clients are offered for nss-mdns package functionality. It is not possible to disable the unix socket `/run/avahi-daemon/socket`, but resolution requests received via DBus are not affected directly. Tools avahi-resolve, avahi-resolve-address and avahi-resolve-host-name are not affected, they use DBus interface. It is possible to change permissions of unix socket after avahi-daemon is started. But avahi-daemon does not provide any configuration for it. Additional access restrictions like SELinux can also prevent unwanted tools to access the socket and keep resolution working for trusted users.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	avahi	sid	`0.8-18`	vulnerable
Debian	avahi	forky	`0.8-18`	vulnerable
Debian	avahi	trixie	`0.8-16`	vulnerable
Debian	avahi	bookworm	`0.8-10+deb12u1`	vulnerable
Cpe	avahi	Not reported	Not reported	unknown
Suse	avahi	linux micro 6.1	`0.8-slfo.1.1_8.1`	fixed
Suse	avahi	linux micro 6.0	`0.8-10.1`	fixed
Suse	avahi	linux micro 6.2	`0.8-160000.6.1`	fixed
Suse	avahi	linux enterprise server 16.0	`0.8-160000.6.1`	fixed
Suse	avahi-glib2	linux enterprise server 16.0	`0.8-160000.6.1`	fixed
Suse	avahi	linux enterprise server for sap applications 16.0	`0.8-160000.6.1`	fixed
Suse	avahi-glib2	linux enterprise server for sap applications 16.0	`0.8-160000.6.1`	fixed
Opensuse	avahi	leap 16.0	`0.8-160000.6.1`	fixed
Opensuse	avahi-glib2	leap 16.0	`0.8-160000.6.1`	fixed
Opensuse	avahi-qt6	leap 16.0	`0.8-160000.6.1`	fixed
Suse	avahi	linux enterprise module for basesystem 15 sp7	`0.8-150600.15.21.1`	fixed
Suse	avahi-glib2	linux enterprise module for basesystem 15 sp7	`0.8-150600.15.21.1`	fixed
Suse	avahi	linux enterprise module for desktop applications 15 sp7	`0.8-150600.15.21.1`	fixed
Suse	avahi-glib2	linux enterprise module for desktop applications 15 sp7	`0.8-150600.15.21.1`	fixed
Suse	avahi	linux enterprise module for package hub 15 sp7	`0.8-150600.15.21.1`	fixed
Suse	avahi	linux enterprise server ltss extended security 12 sp5	`0.6.32-32.45.1`	fixed
Suse	avahi	linux enterprise micro 5.3	`0.8-150400.7.34.1`	fixed
Suse	avahi	linux enterprise micro 5.4	`0.8-150400.7.34.1`	fixed
Suse	avahi	linux enterprise micro 5.5	`0.8-150400.7.34.1`	fixed
Opensuse	avahi	tumbleweed	`0.8-45.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	avahi	source	sid	`(unfixed)`	not yet assigned	Not reported	[1123671]
Debian	avahi	source	forky	`(unfixed)`	not yet assigned	Not reported	[1123671]
Debian	avahi	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1123671]
Debian	avahi	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1123671]
Suse	avahi	rpm	linux micro 6.1	`0.8-slfo.1.1_8.1`	Not reported	SUSE-SU-2026:23161-1	Not reported
Suse	avahi	rpm	linux micro 6.0	`0.8-10.1`	Not reported	SUSE-SU-2026:23039-1	Not reported
Suse	avahi	rpm	linux micro 6.2	`0.8-160000.6.1`	Not reported	SUSE-SU-2026:22932-1	Not reported
Suse	avahi	rpm	linux enterprise server 16.0	`0.8-160000.6.1`	Not reported	SUSE-SU-2026:22853-1	Not reported
Suse	avahi-glib2	rpm	linux enterprise server 16.0	`0.8-160000.6.1`	Not reported	SUSE-SU-2026:22853-1	Not reported
Suse	avahi	rpm	linux enterprise server for sap applications 16.0	`0.8-160000.6.1`	Not reported	SUSE-SU-2026:22853-1	Not reported
Suse	avahi-glib2	rpm	linux enterprise server for sap applications 16.0	`0.8-160000.6.1`	Not reported	SUSE-SU-2026:22853-1	Not reported
Opensuse	avahi	rpm	leap 16.0	`0.8-160000.6.1`	Not reported	OPENSUSE-SU-2026:21417-1	Not reported
Opensuse	avahi-glib2	rpm	leap 16.0	`0.8-160000.6.1`	Not reported	OPENSUSE-SU-2026:21417-1	Not reported
Opensuse	avahi-qt6	rpm	leap 16.0	`0.8-160000.6.1`	Not reported	OPENSUSE-SU-2026:21417-1	Not reported
Suse	avahi	rpm	linux enterprise module for basesystem 15 sp7	`0.8-150600.15.21.1`	Not reported	SUSE-SU-2026:3218-1	Not reported
Suse	avahi-glib2	rpm	linux enterprise module for basesystem 15 sp7	`0.8-150600.15.21.1`	Not reported	SUSE-SU-2026:3218-1	Not reported
Suse	avahi	rpm	linux enterprise module for desktop applications 15 sp7	`0.8-150600.15.21.1`	Not reported	SUSE-SU-2026:3218-1	Not reported
Suse	avahi-glib2	rpm	linux enterprise module for desktop applications 15 sp7	`0.8-150600.15.21.1`	Not reported	SUSE-SU-2026:3218-1	Not reported
Suse	avahi	rpm	linux enterprise module for package hub 15 sp7	`0.8-150600.15.21.1`	Not reported	SUSE-SU-2026:3218-1	Not reported
Suse	avahi	rpm	linux enterprise server ltss extended security 12 sp5	`0.6.32-32.45.1`	Not reported	SUSE-SU-2026:3216-1	Not reported
Suse	avahi	rpm	linux enterprise micro 5.3	`0.8-150400.7.34.1`	Not reported	SUSE-SU-2026:3217-1	Not reported
Suse	avahi	rpm	linux enterprise micro 5.4	`0.8-150400.7.34.1`	Not reported	SUSE-SU-2026:3217-1	Not reported
Suse	avahi	rpm	linux enterprise micro 5.5	`0.8-150400.7.34.1`	Not reported	SUSE-SU-2026:3217-1	Not reported
Opensuse	avahi	rpm	tumbleweed	`0.8-45.1`	Not reported	OPENSUSE-SU-2026:11313-1	Not reported

[Debian bug #1123671]

Notes

[trixie] avahi: Minor issue, revisit when fixed upstream [bookworm] avahi: Minor issue, revisit when fixed upstream

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[avahi-autoipd]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[avahi-daemon]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[avahi-discover]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · all · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · all · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[avahi-dnsconfd]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[avahi-ui-utils]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[avahi-utils]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[gir1.2-avahi-0.6]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-client3]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-client-dev]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-common3]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-common-data]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-common-dev]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-compat-libdnssd1]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-compat-libdnssd-dev]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-core7]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-core-dev]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-glib1]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-glib-dev]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-gobject0]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
[libavahi-gobject-dev]Affected
Source package: [avahi]
Details (2)
- 0.8-10+deb12u1 · amd64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12
- 0.8-10+deb12u1 · arm64 · bookworm
  Affected
  dsa · avahi · debian · bookworm; dsa · avahi · debian · 12

Next results

Observed: Oct 26, 2026, 7:18:08 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]