PatchTheCVECVE-2026-24401: Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite
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Routine
MEDIUM 6.5UPGRADE
CVE-2026-24401 is a medium-severity flaw (CVSS 6.5) affecting avahi. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.3% (top 78%) |
| CISA exploited list | No |
| Weakness | CWE-674 |
| Published | 2026-01-24 |
| Last modified | 2026-10-23 |
Publisher (CNA): GitHub, Inc. · Vendor: avahi
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
avahi avahi UPGRADE
Affected: < 0.9 · 0.9 rc1 · 0.9 rc2
Fixed in: 0.9
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy avahi || rpm -q avahi || avahi --version
2. UPGRADE to 0.9 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade avahi
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade avahi
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Related CVEs
- CVE-2025-59529 MEDIUM 5.5 UPGRADE Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite