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CVE-2026-24401— Avahi has Uncontrolled Recursion in lookup_handle_cname function

Quick assessment

Affected
avahi avahi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Avahi是Avahi开源的一套用于Linux的本地服务发现工具。 Avahi 0.9rc2及之前版本存在安全漏洞，该漏洞源于发送包含递归CNAME记录的不请自来mDNS响应，可能导致分段违规和堆栈耗尽。

CVSS 6.5 · Medium EPSS 0.30% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-24401

Vulnerability Information
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Vulnerability Title
Avahi has Uncontrolled Recursion in lookup_handle_cname function
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
Avahi 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Avahi是Avahi开源的一套用于Linux的本地服务发现工具。 Avahi 0.9rc2及之前版本存在安全漏洞，该漏洞源于发送包含递归CNAME记录的不请自来mDNS响应，可能导致分段违规和堆栈耗尽。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
avahi avahi < 78eab31128479f06e30beb8c1cbf99dd921e2524 -

II. Public POCs for CVE-2026-24401

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III. Intelligence Information for CVE-2026-24401

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Vendor Advisories for CVE-2026-24401 (1)

IV. Related Vulnerabilities

Same product: avahi
Same vendor: avahi
Same weakness: CWE-674

V. Comments for CVE-2026-24401

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