Vulnerability-Lookup

OESA-2026-1986 (CVE-2026-34933)

Vulnerability from osv_openeuler – Published: 2026-04-17 11:10 – Updated: 2026-08-06 11:10 – Source website

Summary

avahi security update

Details

Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. This enables you to plug your laptop or computer into a network and instantly be able to view other people who you can chat with, find printers to print to or find files being shared.

Security Fix(es):

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.(CVE-2026-34933)

Severity

5.5 (Medium)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2026-34933	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "avahi-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-autoipd-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-compat-howl-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-compat-howl-devel-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-compat-libdns_sd-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-compat-libdns_sd-devel-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-debuginfo-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-debugsource-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-devel-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-dnsconfd-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-glib-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-glib-devel-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-gobject-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-gobject-devel-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-libs-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-tools-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-ui-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-ui-devel-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-ui-gtk3-0.8-28.oe2403sp1.aarch64.rpm",
          "avahi-ui-tools-0.8-28.oe2403sp1.aarch64.rpm"
        ],
        "noarch": [
          "avahi-help-0.8-28.oe2403sp1.noarch.rpm"
        ],
        "src": [
          "avahi-0.8-28.oe2403sp1.src.rpm"
        ],
        "x86_64": [
          "avahi-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-autoipd-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-compat-howl-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-compat-howl-devel-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-compat-libdns_sd-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-compat-libdns_sd-devel-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-debuginfo-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-debugsource-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-devel-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-dnsconfd-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-glib-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-glib-devel-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-gobject-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-gobject-devel-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-libs-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-tools-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-ui-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-ui-devel-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-ui-gtk3-0.8-28.oe2403sp1.x86_64.rpm",
          "avahi-ui-tools-0.8-28.oe2403sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:24.03-LTS-SP1",
        "name": "avahi",
        "purl": "pkg:rpm/openEuler/avahi\u0026distro=openEuler-24.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.8-28.oe2403sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. This enables you to plug your laptop or computer into a network and instantly be able to view other people who you can chat with, find printers to print to or find files being shared.\r\n\r\nSecurity Fix(es):\n\nAvahi 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.(CVE-2026-34933)",
  "id": "OESA-2026-1986",
  "modified": "2026-08-06T11:10:59Z",
  "published": "2026-04-17T11:10:59Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1986"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34933"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "avahi security update",
  "upstream": [
    "CVE-2026-34933"
  ]
}

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

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
avahi	avahi	Affected: < 0.9-rc4

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-34933",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-06T16:09:17.006482Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-06T16:09:21.475Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2026-04-11T18:09:34.774Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/04/11/9"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "avahi",
          "vendor": "avahi",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.9-rc4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-617",
              "description": "CWE-617: Reachable Assertion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-03T22:43:26.683Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc"
        },
        {
          "name": "https://github.com/avahi/avahi/pull/891",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/avahi/avahi/pull/891"
        },
        {
          "name": "https://github.com/avahi/avahi/commit/625ca0fac19229f6dfa3a6c6b698ae657187e50c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/avahi/avahi/commit/625ca0fac19229f6dfa3a6c6b698ae657187e50c"
        }
      ],
      "source": {
        "advisory": "GHSA-w65r-6gxh-vhvc",
        "discovery": "UNKNOWN"
      },
      "title": "Avahi: Reachable assertion in `transport_flags_from_domain()` via conflicting publish flags crashes avahi-daemon"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-34933",
    "datePublished": "2026-04-03T22:43:26.683Z",
    "dateReserved": "2026-03-31T17:27:08.659Z",
    "dateUpdated": "2026-04-11T18:09:34.774Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
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OESA-2026-1986 (CVE-2026-34933)

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

Tags

Sightings

Nomenclature

Related by attack behaviour