Description
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2 and earlier, an unprivileged local users can crash avahi-daemon (with wide-area disabled) by creating record browsers with the AVAHI_LOOKUP_USE_WIDE_AREA flag set via D-Bus. This can be done by either calling
the RecordBrowserNew method directly or creating hostname/address/service resolvers/browsers that create those browsers internally themselves.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| avahi | avahi | <= 0.9-rc2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | avahi | 0.8-18 | — |
| Debian 13 | avahi | No fix yet | — |
| Debian 12 | avahi | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | avahi | 0.8-16ubuntu3.1 | — |
| Ubuntu 24.04 LTS | avahi | 0.8-13ubuntu6.1 | — |
| Ubuntu 22.04 LTS | avahi | 0.8-5ubuntu5.4 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | avahi | 0.7-4ubuntu7.3+esm1 | — |
| Ubuntu Pro 18.04 LTS | avahi | 0.7-3.1ubuntu1.3+esm3 | — |
| Ubuntu Pro 16.04 LTS | avahi | 0.6.32~rc+dfsg-1ubuntu2.3+esm4 | — |
| Ubuntu Pro 14.04 LTS | avahi | 0.6.31-4ubuntu1.3+esm4 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | avahi +26 | 0.9~rc4-0.1.hum1 | RHSA-2026:11316 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | avahi +1 | 0.8-150600.15.12.1 | SUSE-SU-2026:0259-1 |
| SLES 12 SP5 | avahi | 0.6.32-32.36.1 | SUSE-SU-2026:0422-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | avahi +1 | 0.8-160000.4.1 | SUSE-SU-2026:20145-1 |
| SLES 16.0 | avahi +1 | 0.8-160000.4.1 | SUSE-SU-2026:20145-1 |
| SLE Micro 6.2 | avahi | 0.8-160000.4.1 | SUSE-SU-2026:20167-1 |
| SLE Micro 6.0 | avahi | 0.8-7.1 | SUSE-SU-2026:20525-1 |
| SLE Micro 5.5 | avahi | 0.8-150400.7.26.1 | SUSE-SU-2026:0577-1 |
| SLE Micro 5.4 | avahi | 0.8-150400.7.26.1 | SUSE-SU-2026:0577-1 |
| SLE Micro 5.3 | avahi | 0.8-150400.7.26.1 | SUSE-SU-2026:0577-1 |
| SLE Micro 5.2 | avahi | 0.7-150100.3.46.1 | SUSE-SU-2026:0143-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | avahi | 0.8-41.1 | openSUSE-SU-2026:10052-1 |
| openSUSE Leap 16.0 | avahi +2 | 0.8-160000.4.1 | openSUSE-SU-2026:20110-1 |
| openSUSE Leap 15.6 | avahi +2 | 0.8-150600.15.12.1 | SUSE-SU-2026:0259-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | avahi | 0.8-r25 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | avahi | 0.8-6 | — |
| Azure Linux 2 (CBL-Mariner) | avahi | 0.8-5 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | avahi | 0.9_rc2-r1 | — |
| Wolfi rolling | avahi-dev | 0.9_rc3-r0 | — |
Advisories 11
- RHSA-2026:11316 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- WID-SEC-2026-0066 avahi-daemon: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Aug 10, 2026
- openSUSE-SU-2026:20110-1 Security update for avahi SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2026:10052-1 avahi-0.8-41.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20525-1 Security update for avahi SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20167-1 Security update for avahi SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:20145-1 Security update for avahi SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0422-1 Security update for avahi SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0259-1 Security update for avahi SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0143-1 Security update for avahi SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0577-1 Security update for avahi SUSE / openSUSE Security Updates · Feb 19, 2026