CVE-2026-34933: Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite

Q: How do I fix CVE-2026-34933?

avahi: upgrade to 0.9. Exact commands for each OS are on this page.

Q: Is CVE-2026-34933 being exploited?

CVE-2026-34933 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34933 affect?

CVE-2026-34933 affects avahi. Severity is medium (CVSS 5.5). Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. Prior to version 0.9-rc4, any unprivileged local user can crash avahi-daemon by sending a single D-Bus method call with conflicting

Q: How urgent is CVE-2026-34933?

Priority 27/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2026-34933 is a medium-severity flaw (CVSS 5.5) 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. Prior to version 0.9-rc4, any unprivileged local user can crash avahi-daemon by sending a single D-Bus method call with conflicting publish flags. This issue has been patched in version 0.9-rc4.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-617
Published	2026-04-03
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: avahi

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-03 23:17 UTCPublished CVE record published
2026-07-24 22:10 UTCUpdated Record last modified

avahi avahi UPGRADE

Affected: < 0.9 · 0.9 rc1 · 0.9 rc2 · 0.9 rc3

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.

Quick answers

How do I fix CVE-2026-34933?

avahi: upgrade to 0.9. Exact commands for each OS are on this page.

Is CVE-2026-34933 being exploited?

CVE-2026-34933 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34933 affect?

CVE-2026-34933 affects avahi. Severity is medium (CVSS 5.5). Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. Prior to version 0.9-rc4, any unprivileged local user can crash avahi-daemon by sending a single D-Bus method call with conflicting

How urgent is CVE-2026-34933?

Priority 27/100. Public exploit reference

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
CVE-2026-24401 MEDIUM 6.5 UPGRADE Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite

References

← Back to latest CVEs