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CVE-2026-5773 (GCVE-0-2026-5773)

Vulnerability from cvelistv5 – Published: 2026-05-13 08:27 – Updated: 2026-09-15 06:03
VLAI
Title
wrong reuse of SMB connection
Summary
libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a network transfer operation that was requested by an application could wrongfully reuse an existing SMB connection to the same server that was using a different "share" than the new subsequent transfer should. This could in unlucky situations lead to the download of the wrong file or the upload of a file to the wrong place. When this happens, the same credentials are used and the server name is the same.
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 17:45 UTC
CWE
  • CWE-488 - Exposure of Data Element to Wrong Session
Impacted products
Vendor Product Version CPE status
curl curl Affected: 7.40.0 , < 8.14.2 (semver)
Affected: 8.15.0 , < 8.16.1 (semver)
Affected: 8.17.0 , < 8.20.0 (semver)
guessed Create a notification for this product.
curl curl Affected: aec2e865f06669b9cb5d26cc1148d70bc418b163 , < 74a169575d6412dc0ff532acdf94de35a6c2a571 (git)
guessed Create a notification for this product.
curl curl Affected: 8.19.0
Affected: 8.18.0
Affected: 8.17.0
Affected: 8.16.0
Affected: 8.15.0
Affected: 8.14.1
Affected: 8.14.0
Affected: 8.13.0
Affected: 8.12.1
Affected: 8.12.0
Affected: 8.11.1
Affected: 8.11.0
Affected: 8.10.1
Affected: 8.10.0
Affected: 8.9.1
Affected: 8.9.0
Affected: 8.8.0
Affected: 8.7.1
Affected: 8.7.0
Affected: 8.6.0
Affected: 8.5.0
Affected: 8.4.0
Affected: 8.3.0
Affected: 8.2.1
Affected: 8.2.0
Affected: 8.1.2
Affected: 8.1.1
Affected: 8.1.0
Affected: 8.0.1
Affected: 8.0.0
Affected: 7.88.1
Affected: 7.88.0
Affected: 7.87.0
Affected: 7.86.0
Affected: 7.85.0
Affected: 7.84.0
Affected: 7.83.1
Affected: 7.83.0
Affected: 7.82.0
Affected: 7.81.0
Affected: 7.80.0
Affected: 7.79.1
Affected: 7.79.0
Affected: 7.78.0
Affected: 7.77.0
Affected: 7.76.1
Affected: 7.76.0
Affected: 7.75.0
Affected: 7.74.0
Affected: 7.73.0
Affected: 7.72.0
Affected: 7.71.1
Affected: 7.71.0
Affected: 7.70.0
Affected: 7.69.1
Affected: 7.69.0
Affected: 7.68.0
Affected: 7.67.0
Affected: 7.66.0
Affected: 7.65.3
Affected: 7.65.2
Affected: 7.65.1
Affected: 7.65.0
Affected: 7.64.1
Affected: 7.64.0
Affected: 7.63.0
Affected: 7.62.0
Affected: 7.61.1
Affected: 7.61.0
Affected: 7.60.0
Affected: 7.59.0
Affected: 7.58.0
Affected: 7.57.0
Affected: 7.56.1
Affected: 7.56.0
Affected: 7.55.1
Affected: 7.55.0
Affected: 7.54.1
Affected: 7.54.0
Affected: 7.53.1
Affected: 7.53.0
Affected: 7.52.1
Affected: 7.52.0
Affected: 7.51.0
Affected: 7.50.3
Affected: 7.50.2
Affected: 7.50.1
Affected: 7.50.0
Affected: 7.49.1
Affected: 7.49.0
Affected: 7.48.0
Affected: 7.47.1
Affected: 7.47.0
Affected: 7.46.0
Affected: 7.45.0
Affected: 7.44.0
Affected: 7.43.0
Affected: 7.42.1
Affected: 7.42.0
Affected: 7.41.0
Affected: 7.40.0
guessed Create a notification for this product.
Show details on NVD website

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          "value": "Daniel Stenberg"
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      ],
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          "value": "libcurl might in some circumstances reuse the wrong connection for SMB(S)\ntransfers.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a network transfer operation that was requested by an\napplication could wrongfully reuse an existing SMB connection to the same\nserver that was using a different \"share\" than the new subsequent transfer\nshould.\n\nThis could in unlucky situations lead to the download of the wrong file or the\nupload of a file to the wrong place. When this happens, the same credentials\nare used and the server name is the same."
        }
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      "title": "wrong reuse of SMB connection",
      "x_generator": {
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          {
            "ranges": [
              {
                "events": [
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        ],
        "aliases": [
          "CVE-2026-5773"
        ],
        "credits": [
          {
            "name": "Osama Hamad",
            "type": "finder"
          },
          {
            "name": "Daniel Stenberg",
            "type": "remediation developer"
          }
        ],
        "database_specific": {
          "CWE": {
            "desc": "Exposure of Data Element to Wrong Session",
            "id": "CWE-488"
          },
          "URL": "https://curl.se/docs/CVE-2026-5773.json",
          "affects": "both",
          "issue": "https://hackerone.com/reports/3650689",
          "last_affected": "8.19.0",
          "package": "curl",
          "severity": "Low",
          "www": "https://curl.se/docs/CVE-2026-5773.html"
        },
        "details": "libcurl might in some circumstances reuse the wrong connection for SMB(S)\ntransfers.\n\nlibcurl features a pool of recent connections so that subsequent requests can\nreuse an existing connection to avoid overhead.\n\nWhen reusing a connection a range of criteria must be met. Due to a logical\nerror in the code, a network transfer operation that was requested by an\napplication could wrongfully reuse an existing SMB connection to the same\nserver that was using a different \"share\" than the new subsequent transfer\nshould.\n\nThis could in unlucky situations lead to the download of the wrong file or the\nupload of a file to the wrong place. When this happens, the same credentials\nare used and the server name is the same.",
        "id": "CURL-CVE-2026-5773",
        "modified": "2026-09-07T10:34:51.00Z",
        "published": "2026-04-29T08:00:00.00Z",
        "schema_version": "1.5.0",
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\"7.60.0\"}, {\"status\": \"affected\", \"version\": \"7.59.0\"}, {\"status\": \"affected\", \"version\": \"7.58.0\"}, {\"status\": \"affected\", \"version\": \"7.57.0\"}, {\"status\": \"affected\", \"version\": \"7.56.1\"}, {\"status\": \"affected\", \"version\": \"7.56.0\"}, {\"status\": \"affected\", \"version\": \"7.55.1\"}, {\"status\": \"affected\", \"version\": \"7.55.0\"}, {\"status\": \"affected\", \"version\": \"7.54.1\"}, {\"status\": \"affected\", \"version\": \"7.54.0\"}, {\"status\": \"affected\", \"version\": \"7.53.1\"}, {\"status\": \"affected\", \"version\": \"7.53.0\"}, {\"status\": \"affected\", \"version\": \"7.52.1\"}, {\"status\": \"affected\", \"version\": \"7.52.0\"}, {\"status\": \"affected\", \"version\": \"7.51.0\"}, {\"status\": \"affected\", \"version\": \"7.50.3\"}, {\"status\": \"affected\", \"version\": \"7.50.2\"}, {\"status\": \"affected\", \"version\": \"7.50.1\"}, {\"status\": \"affected\", \"version\": \"7.50.0\"}, {\"status\": \"affected\", \"version\": \"7.49.1\"}, {\"status\": \"affected\", \"version\": \"7.49.0\"}, {\"status\": \"affected\", \"version\": \"7.48.0\"}, {\"status\": \"affected\", \"version\": \"7.47.1\"}, {\"status\": \"affected\", \"version\": \"7.47.0\"}, {\"status\": \"affected\", \"version\": \"7.46.0\"}, {\"status\": \"affected\", \"version\": \"7.45.0\"}, {\"status\": \"affected\", \"version\": \"7.44.0\"}, {\"status\": \"affected\", \"version\": \"7.43.0\"}, {\"status\": \"affected\", \"version\": \"7.42.1\"}, {\"status\": \"affected\", \"version\": \"7.42.0\"}, {\"status\": \"affected\", \"version\": \"7.41.0\"}, {\"status\": \"affected\", \"version\": \"7.40.0\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://curl.se/docs/CVE-2026-5773.json\"}, {\"url\": \"https://curl.se/docs/CVE-2026-5773.html\"}, {\"url\": \"https://hackerone.com/reports/3650689\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"libcurl might in some circumstances reuse the wrong connection for SMB(S)\\ntransfers.\\n\\nlibcurl features a pool of recent connections so that subsequent requests can\\nreuse an existing connection to avoid overhead.\\n\\nWhen reusing a connection a range of criteria must be met. Due to a logical\\nerror in the code, a network transfer operation that was requested by an\\napplication could wrongfully reuse an existing SMB connection to the same\\nserver that was using a different \\\"share\\\" than the new subsequent transfer\\nshould.\\n\\nThis could in unlucky situations lead to the download of the wrong file or the\\nupload of a file to the wrong place. When this happens, the same credentials\\nare used and the server name is the same.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-488\", \"description\": \"Exposure of Data Element to Wrong Session\"}]}], \"providerMetadata\": {\"orgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"shortName\": \"curl\", \"dateUpdated\": \"2026-09-15T06:03:00.894Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-5773\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T06:03:00.894Z\", \"dateReserved\": \"2026-04-08T06:51:05.356Z\", \"assignerOrgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"datePublished\": \"2026-05-13T08:27:42.342Z\", \"assignerShortName\": \"curl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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