CVE-2025-48945 (GCVE-0-2025-48945)

Vulnerability from cvelistv5 – Published: 2025-06-20 19:14 – Updated: 2025-06-20 20:06
VLAI?
Summary
pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-after-free condition that occurs when a Channel object is garbage collected while DNS queries are still pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in pycares 4.9.0 by implementing a safe channel destruction mechanism.
Severity ?
8.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
Assigner
References
Impacted products
Vendor Product Version
aio-libs aiodns Affected: < 4.9.0
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-48945",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-06-20T20:05:50.595661Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-06-20T20:06:23.612Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "aiodns",
          "vendor": "aio-libs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.9.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-after-free condition that occurs when a Channel object is garbage collected while DNS queries are still pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in pycares 4.9.0 by implementing a safe channel destruction mechanism."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-416",
              "description": "CWE-416: Use After Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-20T19:14:27.403Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35"
        },
        {
          "name": "https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35"
        },
        {
          "name": "https://github.com/aio-libs/aiodns/commit/f259a6e3650555157af53ac2b39f2ff545321d55",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/aio-libs/aiodns/commit/f259a6e3650555157af53ac2b39f2ff545321d55"
        },
        {
          "name": "https://github.com/saghul/pycares/commit/ebfd7d71eb8e74bc1057a361ea79a5906db510d4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/saghul/pycares/commit/ebfd7d71eb8e74bc1057a361ea79a5906db510d4"
        },
        {
          "name": "https://github.com/aio-libs/aiodns/releases/tag/v3.5.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/aio-libs/aiodns/releases/tag/v3.5.0"
        },
        {
          "name": "https://github.com/saghul/pycares/releases/tag/v4.9.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/saghul/pycares/releases/tag/v4.9.0"
        }
      ],
      "source": {
        "advisory": "GHSA-5qpg-rh4j-qp35",
        "discovery": "UNKNOWN"
      },
      "title": "pycares has a Use-After-Free Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-48945",
    "datePublished": "2025-06-20T19:14:27.403Z",
    "dateReserved": "2025-05-28T18:49:07.582Z",
    "dateUpdated": "2025-06-20T20:06:23.612Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-48945\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2025-06-20T20:15:33.570\",\"lastModified\":\"2025-06-23T20:16:21.633\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-after-free condition that occurs when a Channel object is garbage collected while DNS queries are still pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in pycares 4.9.0 by implementing a safe channel destruction mechanism.\"},{\"lang\":\"es\",\"value\":\"Pycares es un m\u00f3dulo de Python que proporciona una interfaz para c-ares. C-ares es una librer\u00eda de C que realiza solicitudes DNS y resoluciones de nombres de forma as\u00edncrona. En versiones anteriores a la 4.9.0, Pycares era vulnerable a una condici\u00f3n de use-after-free que se produce cuando un objeto de canal se recolecta como basura mientras las consultas DNS a\u00fan est\u00e1n pendientes. Esto provoca un error fatal de Python y un fallo del int\u00e9rprete. Esta vulnerabilidad se ha corregido en Pycares 4.9.0 mediante la implementaci\u00f3n de un mecanismo seguro de destrucci\u00f3n de canales.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"PRESENT\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"references\":[{\"url\":\"https://github.com/aio-libs/aiodns/commit/f259a6e3650555157af53ac2b39f2ff545321d55\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/aio-libs/aiodns/releases/tag/v3.5.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/saghul/pycares/commit/ebfd7d71eb8e74bc1057a361ea79a5906db510d4\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/saghul/pycares/releases/tag/v4.9.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35\",\"source\":\"security-advisories@github.com\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2025-48945\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-06-20T20:05:50.595661Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-06-20T20:06:00.708Z\"}}], \"cna\": {\"title\": \"pycares has a Use-After-Free Vulnerability\", \"source\": {\"advisory\": \"GHSA-5qpg-rh4j-qp35\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 8.2, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"aio-libs\", \"product\": \"aiodns\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 4.9.0\"}]}], \"references\": [{\"url\": \"https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35\", \"name\": \"https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35\", \"name\": \"https://github.com/saghul/pycares/security/advisories/GHSA-5qpg-rh4j-qp35\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/aio-libs/aiodns/commit/f259a6e3650555157af53ac2b39f2ff545321d55\", \"name\": \"https://github.com/aio-libs/aiodns/commit/f259a6e3650555157af53ac2b39f2ff545321d55\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/saghul/pycares/commit/ebfd7d71eb8e74bc1057a361ea79a5906db510d4\", \"name\": \"https://github.com/saghul/pycares/commit/ebfd7d71eb8e74bc1057a361ea79a5906db510d4\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/aio-libs/aiodns/releases/tag/v3.5.0\", \"name\": \"https://github.com/aio-libs/aiodns/releases/tag/v3.5.0\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/saghul/pycares/releases/tag/v4.9.0\", \"name\": \"https://github.com/saghul/pycares/releases/tag/v4.9.0\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"pycares is a Python module which provides an interface to c-ares. c-ares is a C library that performs DNS requests and name resolutions asynchronously. Prior to version 4.9.0, pycares is vulnerable to a use-after-free condition that occurs when a Channel object is garbage collected while DNS queries are still pending. This results in a fatal Python error and interpreter crash. The vulnerability has been fixed in pycares 4.9.0 by implementing a safe channel destruction mechanism.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416: Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2025-06-20T19:14:27.403Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-48945\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-06-20T20:06:23.612Z\", \"dateReserved\": \"2025-05-28T18:49:07.582Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2025-06-20T19:14:27.403Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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.