CVE-2026-5773 (GCVE-0-2026-5773)
Vulnerability from cvelistv5
Published
2026-05-13 08:27
Modified
2026-09-15 06:03
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-488 - Exposure of Data Element to Wrong Session
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.
References
Impacted products
Vendor Product Version
curl curl Version: 7.40.0   ≤
Version: 8.15.0   ≤
Version: 8.17.0   ≤
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   curl curl Version: aec2e865f06669b9cb5d26cc1148d70bc418b163
 Create a notification for this product.
   curl curl Version: 8.19.0
Version: 8.18.0
Version: 8.17.0
Version: 8.16.0
Version: 8.15.0
Version: 8.14.1
Version: 8.14.0
Version: 8.13.0
Version: 8.12.1
Version: 8.12.0
Version: 8.11.1
Version: 8.11.0
Version: 8.10.1
Version: 8.10.0
Version: 8.9.1
Version: 8.9.0
Version: 8.8.0
Version: 8.7.1
Version: 8.7.0
Version: 8.6.0
Version: 8.5.0
Version: 8.4.0
Version: 8.3.0
Version: 8.2.1
Version: 8.2.0
Version: 8.1.2
Version: 8.1.1
Version: 8.1.0
Version: 8.0.1
Version: 8.0.0
Version: 7.88.1
Version: 7.88.0
Version: 7.87.0
Version: 7.86.0
Version: 7.85.0
Version: 7.84.0
Version: 7.83.1
Version: 7.83.0
Version: 7.82.0
Version: 7.81.0
Version: 7.80.0
Version: 7.79.1
Version: 7.79.0
Version: 7.78.0
Version: 7.77.0
Version: 7.76.1
Version: 7.76.0
Version: 7.75.0
Version: 7.74.0
Version: 7.73.0
Version: 7.72.0
Version: 7.71.1
Version: 7.71.0
Version: 7.70.0
Version: 7.69.1
Version: 7.69.0
Version: 7.68.0
Version: 7.67.0
Version: 7.66.0
Version: 7.65.3
Version: 7.65.2
Version: 7.65.1
Version: 7.65.0
Version: 7.64.1
Version: 7.64.0
Version: 7.63.0
Version: 7.62.0
Version: 7.61.1
Version: 7.61.0
Version: 7.60.0
Version: 7.59.0
Version: 7.58.0
Version: 7.57.0
Version: 7.56.1
Version: 7.56.0
Version: 7.55.1
Version: 7.55.0
Version: 7.54.1
Version: 7.54.0
Version: 7.53.1
Version: 7.53.0
Version: 7.52.1
Version: 7.52.0
Version: 7.51.0
Version: 7.50.3
Version: 7.50.2
Version: 7.50.1
Version: 7.50.0
Version: 7.49.1
Version: 7.49.0
Version: 7.48.0
Version: 7.47.1
Version: 7.47.0
Version: 7.46.0
Version: 7.45.0
Version: 7.44.0
Version: 7.43.0
Version: 7.42.1
Version: 7.42.0
Version: 7.41.0
Version: 7.40.0
 Create a notification for this product.
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          "value": "Osama Hamad"
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          "value": "Daniel Stenberg"
        }
      ],
      "descriptions": [
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          "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."
        }
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      "title": "wrong reuse of SMB connection",
      "x_generator": {
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        "affected": [
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            "ranges": [
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        "aliases": [
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        "credits": [
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            "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",
        "summary": "wrong reuse of SMB connection"
      }
    }
  },
  "cveMetadata": {
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    "cveId": "CVE-2026-5773",
    "datePublished": "2026-05-13T08:27:42.342Z",
    "dateReserved": "2026-04-08T06:51:05.356Z",
    "dateUpdated": "2026-09-15T06:03:00.894Z",
    "state": "PUBLISHED"
  },
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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. 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}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
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