CVE-2026-3805 (GCVE-0-2026-3805)

Vulnerability from cvelistv5 – Published: 2026-03-11 10:09 – Updated: 2026-03-11 15:45
VLAI?
Title
use after free in SMB connection reuse
Summary
When doing a second SMB request to the same host again, curl would wrongly use a data pointer pointing into already freed memory.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
curl curl Affected: 8.18.0 , ≤ 8.18.0 (semver)
Affected: 8.17.0 , ≤ 8.17.0 (semver)
Affected: 8.16.0 , ≤ 8.16.0 (semver)
Affected: 8.15.0 , ≤ 8.15.0 (semver)
Affected: 8.14.1 , ≤ 8.14.1 (semver)
Affected: 8.14.0 , ≤ 8.14.0 (semver)
Affected: 8.13.0 , ≤ 8.13.0 (semver)
Create a notification for this product.
Credits
Daniel Wade Stefan Eissing
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-03-11T10:16:34.391Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/03/11/4"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-3805",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-11T15:45:10.217077Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-11T15:45:38.820Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "lessThanOrEqual": "8.18.0",
              "status": "affected",
              "version": "8.18.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.17.0",
              "status": "affected",
              "version": "8.17.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.16.0",
              "status": "affected",
              "version": "8.16.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.15.0",
              "status": "affected",
              "version": "8.15.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.14.1",
              "status": "affected",
              "version": "8.14.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.14.0",
              "status": "affected",
              "version": "8.14.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.13.0",
              "status": "affected",
              "version": "8.13.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Daniel Wade"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Stefan Eissing"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "When doing a second SMB request to the same host again, curl would wrongly use\na data pointer pointing into already freed memory."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-416 Use After Free",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-11T10:09:37.729Z",
        "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "shortName": "curl"
      },
      "references": [
        {
          "name": "json",
          "url": "https://curl.se/docs/CVE-2026-3805.json"
        },
        {
          "name": "www",
          "url": "https://curl.se/docs/CVE-2026-3805.html"
        },
        {
          "name": "issue",
          "url": "https://hackerone.com/reports/3591944"
        }
      ],
      "title": "use after free in SMB connection reuse"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
    "assignerShortName": "curl",
    "cveId": "CVE-2026-3805",
    "datePublished": "2026-03-11T10:09:37.729Z",
    "dateReserved": "2026-03-08T16:07:39.817Z",
    "dateUpdated": "2026-03-11T15:45:38.820Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-3805\",\"sourceIdentifier\":\"2499f714-1537-4658-8207-48ae4bb9eae9\",\"published\":\"2026-03-11T11:16:00.967\",\"lastModified\":\"2026-03-12T14:08:56.790\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"When doing a second SMB request to the same host again, curl would wrongly use\\na data pointer pointing into already freed memory.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"8.13.0\",\"versionEndExcluding\":\"8.19.0\",\"matchCriteriaId\":\"20C6A28F-3350-4078-B85B-7CF549818504\"}]}]}],\"references\":[{\"url\":\"https://curl.se/docs/CVE-2026-3805.html\",\"source\":\"2499f714-1537-4658-8207-48ae4bb9eae9\",\"tags\":[\"Patch\",\"Vendor Advisory\"]},{\"url\":\"https://curl.se/docs/CVE-2026-3805.json\",\"source\":\"2499f714-1537-4658-8207-48ae4bb9eae9\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://hackerone.com/reports/3591944\",\"source\":\"2499f714-1537-4658-8207-48ae4bb9eae9\",\"tags\":[\"Exploit\",\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/03/11/4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"use after free in SMB connection reuse\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"When doing a second SMB request to the same host again, curl would wrongly use\\na data pointer pointing into already freed memory.\"}], \"providerMetadata\": {\"orgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"shortName\": \"curl\", \"dateUpdated\": \"2026-03-11T10:09:37.729Z\"}, \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-416 Use After Free\"}]}], \"affected\": [{\"vendor\": \"curl\", \"product\": \"curl\", \"versions\": [{\"version\": \"8.18.0\", \"status\": \"affected\", \"lessThanOrEqual\": \"8.18.0\", \"versionType\": \"semver\"}, {\"version\": \"8.17.0\", \"status\": \"affected\", \"lessThanOrEqual\": \"8.17.0\", \"versionType\": \"semver\"}, {\"version\": \"8.16.0\", \"status\": \"affected\", \"lessThanOrEqual\": \"8.16.0\", \"versionType\": \"semver\"}, {\"version\": \"8.15.0\", \"status\": \"affected\", \"lessThanOrEqual\": \"8.15.0\", \"versionType\": \"semver\"}, {\"version\": \"8.14.1\", \"status\": \"affected\", \"lessThanOrEqual\": \"8.14.1\", \"versionType\": \"semver\"}, {\"version\": \"8.14.0\", \"status\": \"affected\", \"lessThanOrEqual\": \"8.14.0\", \"versionType\": \"semver\"}, {\"version\": \"8.13.0\", \"status\": \"affected\", \"lessThanOrEqual\": \"8.13.0\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://curl.se/docs/CVE-2026-3805.json\", \"name\": \"json\"}, {\"url\": \"https://curl.se/docs/CVE-2026-3805.html\", \"name\": \"www\"}, {\"url\": \"https://hackerone.com/reports/3591944\", \"name\": \"issue\"}], \"credits\": [{\"lang\": \"en\", \"value\": \"Daniel Wade\", \"type\": \"finder\"}, {\"lang\": \"en\", \"value\": \"Stefan Eissing\", \"type\": \"remediation developer\"}]}, \"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2026/03/11/4\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2026-03-11T10:16:34.391Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-3805\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-11T15:45:10.217077Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-11T15:45:22.292Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-3805\", \"assignerOrgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"curl\", \"dateReserved\": \"2026-03-08T16:07:39.817Z\", \"datePublished\": \"2026-03-11T10:09:37.729Z\", \"dateUpdated\": \"2026-03-11T15:45:38.820Z\"}",
      "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.