CVE-2026-24401Public exploitNetwork attack vectorHinoki check available

Daemon crash via recursive CNAME lookup

Published Jan 24, 2026 · Updated Jan 24, 2026

Uncontrolled recursion in Avahi 0.9-rc2 and earlier allows remote attackers to crash avahi-daemon with a recursive mDNS CNAME response. lookup_handle_cname follows a self-referential alias without detecting that the CNAME target is already in its lookup path, exhausting the stack. The daemon is exposed only while a multicast-enabled record browser is active, including a resolver browser created by nss-mdns, and a crafted unsolicited LAN response terminates the process.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Uncontrolled recursion in Avahi 0.9-rc2 and earlier allows remote attackers to crash avahi-daemon with a recursive mDNS CNAME response. lookup_handle_cname follows a self-referential alias without detecting that the CNAME target is already in its lookup path, exhausting the stack. The daemon is exposed only while a multicast-enabled record browser is active, including a resolver browser created by nss-mdns, and a crafted unsolicited LAN response terminates the process.

The record

CVE
CVE-2026-24401
Published
Jan 24, 2026
Updated
Jan 24, 2026
Vendor
Avahi
Product
Avahi
Classifications
CWE-674, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 78eab31128479f06e30beb8c1cbf99dd921e2524

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Avahi · Avahiversion=< 78eab31128479f06e30beb8c1cbf99dd921e2524

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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