CVE-2026-24401
published 2026-01-24CVE-2026-24401: 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…
PriorityP432medium6.5CVSS 3.1
AVNACLPRNUIRSUCNINAH
EPSS
0.25%
16.5th percentile
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| avahi | avahi | < 78eab31128479f06e30beb8c1cbf99dd921e2524 | 78eab31128479f06e30beb8c1cbf99dd921e2524 |
| avahi | avahi | < 0.9 | 0.9 |
| avahi | avahi | — | — |
| avahi | avahi | >= 0 < 0.8-18 | 0.8-18 |
| debian | avahi | < avahi 0.8-18 (forky) | avahi 0.8-18 (forky) |
| ubuntu | avahi | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
osv6.5MEDIUM
vendor_debian6.5MEDIUM
vendor_redhat6.5MEDIUM
vendor_ubuntu6.5MEDIUM
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Ubuntu
Avahi vulnerabilities
vendor_ubuntu·2026-05-12·CVSS 6.5
CVE-2026-34933 [MEDIUM] Avahi vulnerabilities
Title: Avahi vulnerabilities
Summary: Several security issues were fixed in Avahi.
It is discovered that Avahi incorrectly handled crafted input. A
remote attacker could possibly use this issue to crash the program,
resulting in a denial of service. This issue only affected Ubuntu
14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS,
Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-24401)
Guillaume Meunier discovered that Avahi incorrectly handled crafted
input. An attacker could possibly use this issue to crash the
program, resulting in a denial of service. (CVE-2026-34933)
Red Hat
avahi: Avahi: Denial of Service via recursive CNAME record in mDNS response
vendor_redhat·2026-01-24·CVSS 6.5
CVE-2026-24401 [MEDIUM] CWE-674 avahi: Avahi: Denial of Service via recursive CNAME record in mDNS response
avahi: Avahi: Denial of Service via recursive CNAME record in mDNS response
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.
A flaw was fo
Debian
CVE-2026-24401: avahi - Avahi is a system which facilitates service discovery on a local network via the...
vendor_debian·2026·CVSS 6.5
CVE-2026-24401 [MEDIUM] CVE-2026-24401: avahi - Avahi is a system which facilitates service discovery on a local network via the...
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.
Scope: local
bookworm: open
bullseye: open
forky: resolved (fixed in 0.8-18)
sid: resolved
OSV
CVE-2026-24401: Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite
osv·2026-01-24·CVSS 6.5
CVE-2026-24401 [MEDIUM] CVE-2026-24401: Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite
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.
No detection rules found.
No public exploits indexed.
Wiz
CVE-2026-34933 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 5.5
CVE-2026-34933 [MEDIUM] CVE-2026-34933 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-34933 :
Avahi vulnerability analysis and mitigation
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.
Source : NVD
## 5.5
Score
Published April 3, 2026
Severity MEDIUM
CNA Score 5.5
Affected Technologies
Avahi
Linux Red Hat
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 1.6
Exploitation Probability (EPSS) N/A
Affected packages and libraries
avahi-libs
avahi-qt4-devel
Sources
NVD
Chainguard Has Fix Added at: Apr 05,
Wiz
CVE-2025-59529 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 5.5
CVE-2025-59529 [MEDIUM] CVE-2025-59529 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2025-59529 :
Avahi vulnerability analysis and mitigation
CLIENTS_MAX
server_work()
accept()
client_new()
n_clients
*.local.
/run/avahi-daemon/socket
Source : NVD
## 5.5
Score
Published December 18, 2025
Severity MEDIUM
CNA Score 5.5
Affected Technologies
Avahi
Linux Red Hat
Has Public Exploit Yes
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 8.3
Exploitation Probability (EPSS) N/A
Affected packages and libraries
avahi
avahi-compat-howl-devel
Sources
Alpine 3.10, 3.11, 3.12, 3.13, 3.14, 3.15, 3.16, 3.17, 3.18, 3.19, 3.20, 3.21, edge Severity MEDIUM No Fix Added at: Jan 18, 2026
Alpine 3.22, 3.23 Severity MEDIUM No Fix Added at: Jan 28, 2026
Chainguard Has Fix Added at: Dec 21, 2025
D
Wiz
CVE-2025-68276 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 5.5
CVE-2025-68276 [MEDIUM] CVE-2025-68276 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2025-68276 :
Avahi vulnerability analysis and mitigation
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.
Source : NVD
## 5.5
Score
Published January 12, 2026
Severity MEDIUM
CNA Score 5.5
Affected Technologies
Avahi
Linux Red Hat
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Pe
Wiz
CVE-2025-68471 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 6.5
CVE-2025-68471 [MEDIUM] CVE-2025-68471 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2025-68471 :
Avahi vulnerability analysis and mitigation
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, avahi-daemon can be crashed by sending 2 unsolicited announcements with CNAME resource records 2 seconds apart.
Source : NVD
## 6.5
Score
Published January 12, 2026
Severity MEDIUM
CNA Score 6.5
Affected Technologies
Avahi
Linux Red Hat
Has Public Exploit Yes
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 4
Exploitation Probability (EPSS) N/A
Affected packages and libraries
python313-avahi
libavahi-core7
Sources
Alpine 3.10, 3.11, 3.12, 3.13, 3.14, 3.15, 3.16, 3.17, 3.18, 3.19, 3.20, 3.21 Severity MEDIUM N
Wiz
CVE-2025-68468 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 6.5
CVE-2025-68468 [MEDIUM] CVE-2025-68468 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2025-68468 :
Avahi vulnerability analysis and mitigation
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, avahi-daemon can be crashed by sending unsolicited announcements containing CNAME resource records pointing it to resource records with short TTLs. As soon as they expire avahi-daemon crashes.
Source : NVD
## 6.5
Score
Published January 12, 2026
Severity MEDIUM
CNA Score 6.5
Affected Technologies
Avahi
Linux Red Hat
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 2.5
Exploitation Probability (EPSS) N/A
Affected packages and libraries
avahi-ui-tools
cpe:2.3:a:avahi:avahi
Sources
Alpine
Wiz
CVE-2026-24401 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 6.5
CVE-2026-24401 [MEDIUM] CVE-2026-24401 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-24401 :
Avahi vulnerability analysis and mitigation
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.
Source : NVD
## 6.5
Bugzilla
CVE-2026-24401 avahi: Avahi: Denial of Service via recursive CNAME record in mDNS response [fedora-42]
bugzilla·2026-01-28·CVSS 6.5
CVE-2026-24401 [MEDIUM] CVE-2026-24401 avahi: Avahi: Denial of Service via recursive CNAME record in mDNS response [fedora-42]
CVE-2026-24401 avahi: Avahi: Denial of Service via recursive CNAME record in mDNS response [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug reports from releases that are no longer
maintained. At that time this bug will be closed as EOL if it remains open with a
'version' of '42'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained ver
Bugzilla
CVE-2026-24401 avahi: Avahi: Denial of Service via recursive CNAME record in mDNS response
bugzilla·2026-01-24·CVSS 6.5
CVE-2026-24401 [MEDIUM] CVE-2026-24401 avahi: Avahi: Denial of Service via recursive CNAME record in mDNS response
CVE-2026-24401 avahi: Avahi: Denial of Service via recursive CNAME record in mDNS response
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.
2026-01-24
Published