Vulnerability-Lookup

CVE-2026-34933 (GCVE-0-2026-34933)

Vulnerability from cvelistv5 – Published: 2026-04-03 22:43 – Updated: 2026-04-11 18:09

Title

Avahi: Reachable assertion in `transport_flags_from_domain()` via conflicting publish flags crashes avahi-daemon

Summary

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.

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-06 16:09 UTC

CWE

CWE-617 - Reachable Assertion

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/avahi/avahi/security/advisorie…	x_refsource_CONFIRM
https://github.com/avahi/avahi/pull/891	x_refsource_MISC
https://github.com/avahi/avahi/commit/625ca0fac19…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2026/04/11/9

Impacted products

1 product

Vendor	Product	Version	CPE status
avahi	avahi	Affected: < 0.9-rc4	guessed

Show details on NVD website

JSON

To clipboard

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CERTFR-2026-AVI-0435

Vulnerability from certfr_avis - Published: 2026-04-14 - Updated: 2026-04-14

De multiples vulnérabilités ont été découvertes dans les produits Microsoft. Elles permettent à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

None

Impacted products

Vendor	Product	Description
Microsoft	N/A	cbl2 avahi 0.8-5 versions antérieures à 0.8-6
Microsoft	N/A	azl3 libcap 2.69-13 versions antérieures à 2.69-14
Microsoft	N/A	azl3 avahi 0.8-7 versions antérieures à 0.8-8
Microsoft	N/A	azl3 util-linux 2.40.2-3 versions antérieures à 2.40.2-4
Microsoft	N/A	cbl2 libcap 2.60-7 versions antérieures à 2.60-8

References

Title

Publication Time

FKIE_CVE-2026-34933

Vulnerability from fkie_nvd - Published: 2026-04-03 23:17 - Updated: 2026-07-24 22:10

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/avahi/avahi/commit/625ca0fac19229f6dfa3a6c6b698ae657187e50c	Patch
security-advisories@github.com	https://github.com/avahi/avahi/pull/891	Issue Tracking, Patch
security-advisories@github.com	https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc	Exploit, Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/04/11/9	Exploit, Mailing List, Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc	Exploit, Patch, Vendor Advisory

Impacted products

Vendor	Product	Version
avahi	avahi	*
avahi	avahi	0.9
avahi	avahi	0.9
avahi	avahi	0.9

JSON

To clipboard

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        "Vendor Advisory"
      ],
      "url": "https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2026/04/11/9"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

MSRC_CVE-2026-34933

Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-04-14 14:44

Summary

Avahi: Reachable assertion in `transport_flags_from_domain()` via conflicting publish flags crashes avahi-daemon

Scope

1 vulnerability in this advisory, including CVE-2026-34933.

CVE-2026-34933

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Fixed: 3 products Known affected: 3 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OPENSUSE-SU-2026:10670-1

Vulnerability from csaf_opensuse - Published: 2026-05-04 00:00 - Updated: 2026-05-04 00:00

Summary

avahi-0.8-43.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-34933.

CVE-2026-34933

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 76 products

Open the full advisory

RHSA-2026:11316

Vulnerability from csaf_redhat - Published: 2026-04-28 04:05 - Updated: 2026-09-06 23:40

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Moderate

Scope

5 vulnerabilities in this advisory, including CVE-2026-34933.

CVE-2026-34933

A flaw was found in Avahi. An unprivileged local user can exploit this vulnerability by sending a D-Bus method call with conflicting publish flags. This can lead to a denial of service (DoS) by crashing the avahi-daemon, making the service unavailable.

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Fixed: 3 products

https://access.redhat.com/errata/RHSA-2026:11316

Open the full advisory

SUSE-SU-2026:21417-1

Vulnerability from csaf_suse - Published: 2026-04-29 11:16 - Updated: 2026-04-29 11:16

Summary

Security update for avahi

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-34933.

CVE-2026-34933

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 12 products

Open the full advisory

SUSE-SU-2026:21631-1

Vulnerability from csaf_suse - Published: 2026-05-09 15:48 - Updated: 2026-05-09 15:48

Summary

Security update for avahi

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-34933.

CVE-2026-34933

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 16 products

Open the full advisory

SUSE-SU-2026:22258-1

Vulnerability from csaf_suse - Published: 2026-06-22 14:38 - Updated: 2026-06-22 14:38

Summary

Security update for avahi

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2026-34933.

CVE-2026-34933

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 16 products

Open the full advisory

SUSE-SU-2026:22338-1

Vulnerability from csaf_suse - Published: 2026-06-22 14:38 - Updated: 2026-06-22 14:38

Summary

Security update for avahi

Severity

Moderate

Scope

2 vulnerabilities in this advisory, including CVE-2026-34933.

CVE-2026-34933

5.5 (Medium)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Recommended: 162 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-34933 (GCVE-0-2026-34933)

Solutions

Tags

Sightings

Nomenclature