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

{
  "id": "5825d78c8218434fd9244794d3d33829e6f24b4631481b344ad9091fa260d05e",
  "url": "https://osv.dev/vulnerability/CVE-2026-34933",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-34933",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-34933",
      "aliases": [
        "CVE-2026-34933",
        "GHSA-w65r-6gxh-vhvc"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/avahi/avahi",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8ee3bd6f7921b489bde14f120187a5becf134d30"
                },
                {
                  "fixed": "625ca0fac19229f6dfa3a6c6b698ae657187e50c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:avahi:avahi:0.9:rc1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.9-rc1"
                      },
                      {
                        "last_affected": "0.9-rc1"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:avahi:avahi:0.9:rc2:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.9-rc2"
                      },
                      {
                        "last_affected": "0.9-rc2"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:avahi:avahi:0.9:rc3:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.9-rc3"
                      },
                      {
                        "last_affected": "0.9-rc3"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "range": [
                      {
                        "fixed": "625ca0fac19229f6dfa3a6c6b698ae657187e50c"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.9-rc1",
            "0.9-rc2",
            "0.9-rc3",
            "v0.9-rc3",
            "v0.9-rc2",
            "v0.9-rc1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-34933.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.748169528Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34933.json",
        "https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-34933",
        "https://github.com/avahi/avahi/commit/625ca0fac19229f6dfa3a6c6b698ae657187e50c",
        "https://github.com/avahi/avahi/pull/891"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-617"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34933.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-34933",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494462,
  "published_at": "2026-04-03T22:43:26.683+00:00"
}