CVE-2026-24401 (GCVE-0-2026-24401)

Vulnerability from cvelistv5 – Published: 2026-01-24 01:25 – Updated: 2026-01-26 16:17
VLAI?
Title
Avahi has Uncontrolled Recursion in lookup_handle_cname function
Summary
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions 0.9rc2 and below, avahi-daemon can be crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the alias and canonical name point to the same domain (e.g., "h.local" as a CNAME for "h.local"). This causes unbounded recursion in the lookup_handle_cname function, leading to stack exhaustion. The vulnerability affects record browsers where AVAHI_LOOKUP_USE_MULTICAST is set explicitly, which includes record browsers created by resolvers used by nss-mdns. This issue is patched in commit 78eab31128479f06e30beb8c1cbf99dd921e2524.
Severity ?
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
avahi avahi Affected: < 78eab31128479f06e30beb8c1cbf99dd921e2524
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-24401",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-26T16:14:24.982686Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-26T16:17:24.487Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "avahi",
          "vendor": "avahi",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 78eab31128479f06e30beb8c1cbf99dd921e2524"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions 0.9rc2 and below, avahi-daemon can be crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the alias and canonical name point to the same domain (e.g., \"h.local\" as a CNAME for \"h.local\"). This causes unbounded recursion in the lookup_handle_cname function, leading to stack exhaustion. The vulnerability affects record browsers where AVAHI_LOOKUP_USE_MULTICAST is set explicitly, which includes record browsers created by resolvers used by nss-mdns. This issue is patched in commit 78eab31128479f06e30beb8c1cbf99dd921e2524."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-674",
              "description": "CWE-674: Uncontrolled Recursion",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-24T01:25:02.294Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3"
        },
        {
          "name": "https://github.com/avahi/avahi/issues/501",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/avahi/avahi/issues/501"
        },
        {
          "name": "https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524"
        }
      ],
      "source": {
        "advisory": "GHSA-h4vp-5m8j-f6w3",
        "discovery": "UNKNOWN"
      },
      "title": "Avahi has Uncontrolled Recursion in lookup_handle_cname function"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-24401",
    "datePublished": "2026-01-24T01:25:02.294Z",
    "dateReserved": "2026-01-22T18:19:49.172Z",
    "dateUpdated": "2026-01-26T16:17:24.487Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-24401",
      "date": "2026-04-19",
      "epss": "0.00043",
      "percentile": "0.13001"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-24401\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-01-24T02:15:48.760\",\"lastModified\":\"2026-02-12T15:58:27.273\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions 0.9rc2 and below, avahi-daemon can be crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the alias and canonical name point to the same domain (e.g., \\\"h.local\\\" as a CNAME for \\\"h.local\\\"). This causes unbounded recursion in the lookup_handle_cname function, leading to stack exhaustion. The vulnerability affects record browsers where AVAHI_LOOKUP_USE_MULTICAST is set explicitly, which includes record browsers created by resolvers used by nss-mdns. This issue is patched in commit 78eab31128479f06e30beb8c1cbf99dd921e2524.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-674\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:avahi:avahi:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"0.9\",\"matchCriteriaId\":\"6481267F-934F-4A0C-9B25-59738E798458\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:avahi:avahi:0.9:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"76971590-AEED-4CB1-B7B7-45EA8FD11524\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:avahi:avahi:0.9:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"83D94AE4-46AC-4955-BB0D-193CF79149A1\"}]}]}],\"references\":[{\"url\":\"https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Patch\"]},{\"url\":\"https://github.com/avahi/avahi/issues/501\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Issue Tracking\",\"Patch\"]},{\"url\":\"https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3\",\"source\":\"security-advisories@github.com\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"Avahi has Uncontrolled Recursion in lookup_handle_cname function\", \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-674\", \"lang\": \"en\", \"description\": \"CWE-674: Uncontrolled Recursion\", \"type\": \"CWE\"}]}], \"metrics\": [{\"cvssV3_1\": {\"attackComplexity\": \"LOW\", \"attackVector\": \"NETWORK\", \"availabilityImpact\": \"HIGH\", \"baseScore\": 6.5, \"baseSeverity\": \"MEDIUM\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"scope\": \"UNCHANGED\", \"userInteraction\": \"REQUIRED\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H\", \"version\": \"3.1\"}}], \"references\": [{\"name\": \"https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3\", \"tags\": [\"x_refsource_CONFIRM\"], \"url\": \"https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3\"}, {\"name\": \"https://github.com/avahi/avahi/issues/501\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/avahi/avahi/issues/501\"}, {\"name\": \"https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524\", \"tags\": [\"x_refsource_MISC\"], \"url\": \"https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524\"}], \"affected\": [{\"vendor\": \"avahi\", \"product\": \"avahi\", \"versions\": [{\"version\": \"\u003c 78eab31128479f06e30beb8c1cbf99dd921e2524\", \"status\": \"affected\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-01-24T01:25:02.294Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions 0.9rc2 and below, avahi-daemon can be crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the alias and canonical name point to the same domain (e.g., \\\"h.local\\\" as a CNAME for \\\"h.local\\\"). This causes unbounded recursion in the lookup_handle_cname function, leading to stack exhaustion. The vulnerability affects record browsers where AVAHI_LOOKUP_USE_MULTICAST is set explicitly, which includes record browsers created by resolvers used by nss-mdns. This issue is patched in commit 78eab31128479f06e30beb8c1cbf99dd921e2524.\"}], \"source\": {\"advisory\": \"GHSA-h4vp-5m8j-f6w3\", \"discovery\": \"UNKNOWN\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-24401\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-26T16:14:24.982686Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-26T16:14:25.957Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-24401\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"GitHub_M\", \"dateReserved\": \"2026-01-22T18:19:49.172Z\", \"datePublished\": \"2026-01-24T01:25:02.294Z\", \"dateUpdated\": \"2026-01-26T16:17:24.487Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.