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CVE-2026-24401

Avahi has Uncontrolled Recursion in lookup_handle_cname function

Published: Jan 24, 2026Updated: Feb 12, 2026 Sources: CVE List NVD BDUCWE-674
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 83.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-674

Affected Products

avahiavahi
On-prem
Operating Systems / linux-distro
Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
OpenShift Container PlatformRed Hat Inc.
SaaSSaaS Service
Cloud & SaaS / container-orchestration
Platform V SberLinux OS ServerАО «СберТех»
On-premOS
Operating Systems / linux-distro
AvahiThe Avahi Project
On-prem
Networking Infrastructure / dns-dhcp-ntp
avahioss-projectOperating Systemsaka avahi-daemon
red hat inc.commercialUSOperating Systemsaka red hat
ао «сбертех»commercialRUOperating Systemsaka ao sbertech, сбертех
the avahi projectoss-projectNetworking Infrastructureaka avahi

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524
github.com
https://github.com/avahi/avahi/issues/501
github.com
https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3
github.com
and 2 more references View all →

Timeline

Published
Jan 24, 2026
Last Updated
Feb 12, 2026

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