How severe is CVE-2026-24401?

CVE-2026-24401 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-24401 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-24401?

CVE-2026-24401 primarily affects Avahi. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-24401?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-24401 have an EU (EUVD) identifier?

Yes. CVE-2026-24401 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4603.

When was CVE-2026-24401 published?

CVE-2026-24401 was published on 2026-01-24 and last updated on 2026-06-17.

CVE-2026-24401

CVE-2026-24401 is a medium-severity vulnerability in Avahi with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-674.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4603
Weakness: CWE-674
Affected product: Avahi
Published: 2026-01-24
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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 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.
How severe is CVE-2026-24401?: CVE-2026-24401 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-24401 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-24401?: CVE-2026-24401 primarily affects Avahi. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-24401?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-24401 have an EU (EUVD) identifier?: Yes. CVE-2026-24401 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4603.
When was CVE-2026-24401 published?: CVE-2026-24401 was published on 2026-01-24 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:avahi:avahi:*:*:*:*:*:*:*:*
cpe:2.3:a:avahi:avahi:0.9:rc1:*:*:*:*:*:*
cpe:2.3:a:avahi:avahi:0.9:rc2:*:*:*:*:*:*

More vulnerabilities in Avahi

CVE-2017-6519 — Critical (CVSS 9.1): avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that…
CVE-2021-26720 — High (CVSS 7.8): avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via…
CVE-2025-68471 — Medium (CVSS 6.5): Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2…
CVE-2025-68468 — Medium (CVSS 6.5): Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2…
CVE-2023-38473 — Medium (CVSS 6.2): A vulnerability was found in Avahi. A reachable assertion exists in the avahi_alternative_host_name() function.
CVE-2023-38472 — Medium (CVSS 6.2): A vulnerability was found in Avahi. A reachable assertion exists in the avahi_rdata_parse() function.

All CVEs affecting Avahi →

Other CWE-674 (Uncontrolled Recursion) vulnerabilities

CVE-2026-43185 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix signededness bug in…
CVE-2023-51803 — Critical (CVSS 9.8): LinuxServer.io Heimdall before 2.5.7 does not prevent use of icons that have non-image data such as the "<?php ?>"…
CVE-2021-41752 — Critical (CVSS 9.8): Stack overflow vulnerability in Jerryscript before commit e1ce7dd7271288be8c0c8136eea9107df73a8ce2 on Oct 20, 2021 due…
CVE-2018-1000618 — Critical (CVSS 9.8): EOSIO/eos eos version after commit f1545dd0ae2b77580c2236fdb70ae7138d2c7168 contains a stack overflow vulnerability in…
CVE-2025-10728 — Critical (CVSS 9.4): When the module renders a Svg file that contains a <pattern> element, it might end up rendering it recursively leading…
CVE-2026-40324 — Critical (CVSS 9.1): Hot Chocolate is an open-source GraphQL server. Prior to versions 12.22.7, 13.9.16, 14.3.1, and 15.1.14, Hot…

Browse all CWE-674 (Uncontrolled Recursion) vulnerabilities →