CVE-2026-19931 (GCVE-0-2026-19931)
Vulnerability from cvelistv5
Published
2026-09-06 17:47
Modified
2026-09-15 06:02
Severity ?
CWE
  • CWE-488 - Exposure of Data Element to Wrong Session
Summary
A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection.
Impacted products
Vendor Product Version
curl curl Version: 7.64.1   
Version: 8.15.0   
Version: 8.17.0   
Version: 8.21.0   
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   curl curl Version: 6c6035532383e300c712e4c1cd9fdd749ed5cf59
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   curl curl Version: 8.21.0
Version: 8.20.0
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
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Show details on NVD website


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{\"vendor\": \"curl\", \"product\": \"curl\", \"versions\": [{\"status\": \"affected\", \"version\": \"8.21.0\"}, {\"status\": \"affected\", \"version\": \"8.20.0\"}, {\"status\": \"affected\", \"version\": \"8.19.0\"}, {\"status\": \"affected\", \"version\": \"8.18.0\"}, {\"status\": \"affected\", \"version\": \"8.17.0\"}, {\"status\": \"affected\", \"version\": \"8.16.0\"}, {\"status\": \"affected\", \"version\": \"8.15.0\"}, {\"status\": \"affected\", \"version\": \"8.14.1\"}, {\"status\": \"affected\", \"version\": \"8.14.0\"}, {\"status\": \"affected\", \"version\": \"8.13.0\"}, {\"status\": \"affected\", \"version\": \"8.12.1\"}, {\"status\": \"affected\", \"version\": \"8.12.0\"}, {\"status\": \"affected\", \"version\": \"8.11.1\"}, {\"status\": \"affected\", \"version\": \"8.11.0\"}, {\"status\": \"affected\", \"version\": \"8.10.1\"}, {\"status\": \"affected\", \"version\": \"8.10.0\"}, {\"status\": \"affected\", \"version\": \"8.9.1\"}, {\"status\": \"affected\", \"version\": \"8.9.0\"}, {\"status\": \"affected\", \"version\": \"8.8.0\"}, {\"status\": \"affected\", \"version\": \"8.7.1\"}, {\"status\": \"affected\", \"version\": \"8.7.0\"}, {\"status\": \"affected\", \"version\": \"8.6.0\"}, {\"status\": \"affected\", \"version\": \"8.5.0\"}, {\"status\": \"affected\", \"version\": \"8.4.0\"}, {\"status\": \"affected\", \"version\": \"8.3.0\"}, {\"status\": \"affected\", \"version\": \"8.2.1\"}, {\"status\": \"affected\", \"version\": \"8.2.0\"}, {\"status\": \"affected\", \"version\": \"8.1.2\"}, {\"status\": \"affected\", \"version\": \"8.1.1\"}, {\"status\": \"affected\", \"version\": \"8.1.0\"}, {\"status\": \"affected\", \"version\": \"8.0.1\"}, {\"status\": \"affected\", \"version\": \"8.0.0\"}, {\"status\": \"affected\", \"version\": \"7.88.1\"}, {\"status\": \"affected\", \"version\": \"7.88.0\"}, {\"status\": \"affected\", \"version\": \"7.87.0\"}, {\"status\": \"affected\", \"version\": \"7.86.0\"}, {\"status\": \"affected\", \"version\": \"7.85.0\"}, {\"status\": \"affected\", \"version\": \"7.84.0\"}, {\"status\": \"affected\", \"version\": \"7.83.1\"}, {\"status\": \"affected\", \"version\": \"7.83.0\"}, {\"status\": \"affected\", \"version\": \"7.82.0\"}, {\"status\": \"affected\", \"version\": \"7.81.0\"}, {\"status\": \"affected\", \"version\": \"7.80.0\"}, {\"status\": \"affected\", \"version\": \"7.79.1\"}, {\"status\": \"affected\", \"version\": \"7.79.0\"}, {\"status\": \"affected\", \"version\": \"7.78.0\"}, {\"status\": \"affected\", \"version\": \"7.77.0\"}, {\"status\": \"affected\", \"version\": \"7.76.1\"}, {\"status\": \"affected\", \"version\": \"7.76.0\"}, {\"status\": \"affected\", \"version\": \"7.75.0\"}, {\"status\": \"affected\", \"version\": \"7.74.0\"}, {\"status\": \"affected\", \"version\": \"7.73.0\"}, {\"status\": \"affected\", \"version\": \"7.72.0\"}, {\"status\": \"affected\", \"version\": \"7.71.1\"}, {\"status\": \"affected\", \"version\": \"7.71.0\"}, {\"status\": \"affected\", \"version\": \"7.70.0\"}, {\"status\": \"affected\", \"version\": \"7.69.1\"}, {\"status\": \"affected\", \"version\": \"7.69.0\"}, {\"status\": \"affected\", \"version\": \"7.68.0\"}, {\"status\": \"affected\", \"version\": \"7.67.0\"}, {\"status\": \"affected\", \"version\": \"7.66.0\"}, {\"status\": \"affected\", \"version\": \"7.65.3\"}, {\"status\": \"affected\", \"version\": \"7.65.2\"}, {\"status\": \"affected\", \"version\": \"7.65.1\"}, {\"status\": \"affected\", \"version\": \"7.65.0\"}, {\"status\": \"affected\", \"version\": \"7.64.1\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://curl.se/docs/CVE-2026-19931.json\"}, {\"url\": \"https://curl.se/docs/CVE-2026-19931.html\"}, {\"url\": \"https://hackerone.com/reports/3923520\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given\\nhostname using Negotiate authentication, when the initial request is done\\nusing empty credentials. This can make user B\u0027s request get sent over user A\u0027s\\npreviously authenticated connection.\"}], \"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\": \"2026-09-15T06:02:51.009Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-19931\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T06:02:51.009Z\", \"dateReserved\": \"2026-08-15T10:35:02.789Z\", \"assignerOrgId\": \"2499f714-1537-4658-8207-48ae4bb9eae9\", \"datePublished\": \"2026-09-06T17:47:43.523Z\", \"assignerShortName\": \"curl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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