Avahi up to 0.9-rc3 mDNS/DNS-SD assertion

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Avahi up to 0.9-rc3. This affects an unknown part of the component mDNS/DNS-SD. Executing a manipulation can lead to assertion. This vulnerability appears as CVE-2026-34933. The attack requires local access. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Avahi up to 0.9-rc3. This vulnerability affects an unknown functionality of the component mDNS/DNS-SD. The manipulation with an unknown input leads to a assertion vulnerability. The CWE definition for the vulnerability is CWE-617. The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-34933 since 03/31/2026. The exploitation appears to be easy. Local access is required to approach this attack. The technical details are unknown and an exploit is not available.

The vulnerability scanner Nessus provides a plugin with the ID 305007 (Linux Distros Unpatched Vulnerability : CVE-2026-34933), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.9-rc4 eliminates this vulnerability. Applying the patch 625ca0fac19229f6dfa3a6c6b698ae657187e50c is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (305007). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Assertion
CWE: CWE-617
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 305007
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-34933

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Avahi 0.9-rc4
Patch: 625ca0fac19229f6dfa3a6c6b698ae657187e50c

Timelineinfo

03/31/2026 CVE reserved
04/04/2026 +4 days Advisory disclosed
04/04/2026 +0 days VulDB entry created
04/06/2026 +2 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-w65r-6gxh-vhvc
Status: Confirmed

CVE: CVE-2026-34933 (🔒)
GCVE (CVE): GCVE-0-2026-34933
GCVE (VulDB): GCVE-100-355258

Entryinfo

Created: 04/04/2026 08:01
Updated: 04/06/2026 23:18
Changes: 04/04/2026 08:01 (65), 04/06/2026 23:18 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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