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)
CWE
- CWE-674 - Uncontrolled Recursion
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
{
"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": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-24401\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-01-24T02:15:48.760\",\"lastModified\":\"2026-01-26T15:03:33.357\",\"vulnStatus\":\"Awaiting Analysis\",\"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}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-674\"}]}],\"references\":[{\"url\":\"https://github.com/avahi/avahi/commit/78eab31128479f06e30beb8c1cbf99dd921e2524\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/avahi/avahi/issues/501\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/avahi/avahi/security/advisories/GHSA-h4vp-5m8j-f6w3\",\"source\":\"security-advisories@github.com\"}]}}",
"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"
}
}
}
Loading…
Loading…
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.
Loading…
Loading…