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Vulnerabilities

Vulnerability · CVE-2026-24401

Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite.

Published Jan 24, 2026 · catalog updated Oct 24, 2026 · Avahi is a system

Last checked Oct 28, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-24401. EPSS is 0.37%. Act only if a listed version of Avahi is a system is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Avahi is a system).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.37%
Remediation
Version ranges on file
Affected products
Alpine:v3.24 avahi · cpe avahi/avahi

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, which is part of version 0.9-rc3.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Alpine:v3.24 avahi0 → 0.8-r25
  • cpe avahi/avahi0.9
  • cpe avahi/avahi< 0.9

How to fix CVE-2026-24401

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-24401. EPSS is 0.37%. Act only if a listed version of Avahi is a system is installed.

Which versions are affected?

Compare what you have installed with 0 → 0.8-r25, 0.9, < 0.9. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-674. EPSS 0.37%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 24, 2026 · NIST NVD

    Detected

    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 recur

  2. Oct 23, 2026 · NIST NVD

    Updated

    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 recur

  3. Oct 24, 2026 · Trivy Vulnerability DB

    Fix available

    avahi fixed in 0.8-r25

  4. Oct 24, 2026 · Trivy Vulnerability DB

    Fix available

    avahi fixed in 0.8-r25

  5. Oct 24, 2026 · Trivy Vulnerability DB

    Updated

    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 recur

Sources

  • CVE.orgVulnerability recordCVE-2026-24401

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-24401

    30-day exploitation probability 0.37%

    first.org
  • NIST NVDVulnerability recordCVE-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 crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the a

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryALPINE-CVE-2026-24401
    osv.dev
  • Trivy Vulnerability DBPackage advisoryALPINE-CVE-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 crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the a

    osv.dev

References

Freshness

Last verified in this catalog Oct 28, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 28, 2026
  • OpenSSF OSV / OSV ScannerOct 25, 2026
  • Trivy Vulnerability DBOct 25, 2026
  • CVE.orgOct 23, 2026
  • NIST NVDOct 23, 2026