USN-8932-1 (UBUNTU-CVE-2026-86409)

Vulnerability from osv_ubuntu – Published: 2026-10-14 19:26 – Updated: 2026-10-14 19:26 – Source website
VLAI
Summary
curl vulnerabilities
Details

Stanislav Fort discovered that curl did not properly clear AWS SigV4 authentication state when CURLOPT_AWS_SIGV4 was set to NULL. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-86409)

Stanislav Fort discovered that an HTTP proxy could trick libcurl into sending credentials to the proxy itself by responding to a CONNECT request with an unexpected authentication challenge. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-86414)

Stanislav Fort discovered that curl did not correctly handle HSTS entries when an includeSubDomains parent entry was imported before a longer-lived child entry. An attacker could possibly use this issue to cause curl to use unencrypted HTTP connections. This issue only affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-87862)

Stanislav Fort discovered that curl did not properly handle HSTS max-age values that exceeded calendar time structure bounds. An attacker could possibly use this issue to cause a denial of service or data loss. This issue only affected Ubuntu 24.04 LTS. (CVE-2026-87863)

Stanislav Fort discovered that curl did not properly handle IMAP APPEND commands when CURLOPT_CRLF was enabled, allowing overflow bytes to be interpreted as pipelined commands. An authenticated attacker could possibly use this issue to inject arbitrary IMAP commands. (CVE-2026-87864)

Joshua Rogers discovered that libcurl had a use-after-free vulnerability in the FTP wildcard matching code. An attacker could possibly use this issue to cause curl to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-92388)

Joshua Rogers discovered that libcurl's TFTP state machine did not properly validate transfer directions, allowing a malicious server to force the client into transmit mode. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-92389)

Joshua Rogers discovered that curl had a stack overflow vulnerability when processing deeply nested MIME structures. An attacker could possibly use this issue to cause curl to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-92391)

Joshua Rogers discovered that libcurl could expose credentials in the URL returned by CURLINFO_EFFECTIVE_URL when credentials were retrieved from a .netrc file. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-94266)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
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            "binary_version": "7.35.0-1ubuntu2.20+esm24"
          },
          {
            "binary_name": "libcurl3",
            "binary_version": "7.35.0-1ubuntu2.20+esm24"
          },
          {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.35.0-1ubuntu2.20+esm24"
          },
          {
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            "binary_version": "7.35.0-1ubuntu2.20+esm24"
          }
        ]
      },
      "package": {
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      },
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            },
            {
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            }
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          "type": "ECOSYSTEM"
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        "7.33.0-1ubuntu1",
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        "7.35.0-1ubuntu2.6",
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        "7.35.0-1ubuntu2.20+esm11",
        "7.35.0-1ubuntu2.20+esm12",
        "7.35.0-1ubuntu2.20+esm13",
        "7.35.0-1ubuntu2.20+esm14",
        "7.35.0-1ubuntu2.20+esm15",
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    },
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          "cves": [],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
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          {
            "binary_name": "libcurl3-gnutls",
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          {
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        ]
      },
      "package": {
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        "7.45.0-1ubuntu1",
        "7.46.0-1ubuntu1",
        "7.47.0-1ubuntu1",
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        "7.47.0-1ubuntu2.1",
        "7.47.0-1ubuntu2.2",
        "7.47.0-1ubuntu2.3",
        "7.47.0-1ubuntu2.4",
        "7.47.0-1ubuntu2.5",
        "7.47.0-1ubuntu2.6",
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        "7.47.0-1ubuntu2.9",
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        "7.47.0-1ubuntu2.12",
        "7.47.0-1ubuntu2.13",
        "7.47.0-1ubuntu2.14",
        "7.47.0-1ubuntu2.15",
        "7.47.0-1ubuntu2.16",
        "7.47.0-1ubuntu2.18",
        "7.47.0-1ubuntu2.19",
        "7.47.0-1ubuntu2.19+esm1",
        "7.47.0-1ubuntu2.19+esm2",
        "7.47.0-1ubuntu2.19+esm3",
        "7.47.0-1ubuntu2.19+esm4",
        "7.47.0-1ubuntu2.19+esm5",
        "7.47.0-1ubuntu2.19+esm6",
        "7.47.0-1ubuntu2.19+esm7",
        "7.47.0-1ubuntu2.19+esm8",
        "7.47.0-1ubuntu2.19+esm9",
        "7.47.0-1ubuntu2.19+esm10",
        "7.47.0-1ubuntu2.19+esm11",
        "7.47.0-1ubuntu2.19+esm12",
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    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
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          {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.58.0-2ubuntu3.24+esm15"
          },
          {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.58.0-2ubuntu3.24+esm15"
          },
          {
            "binary_name": "libcurl4",
            "binary_version": "7.58.0-2ubuntu3.24+esm15"
          }
        ]
      },
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        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "curl",
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      },
      "ranges": [
        {
          "events": [
            {
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            },
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        "7.58.0-2ubuntu3.6",
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        "7.58.0-2ubuntu3.8",
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        "7.58.0-2ubuntu3.10",
        "7.58.0-2ubuntu3.12",
        "7.58.0-2ubuntu3.13",
        "7.58.0-2ubuntu3.14",
        "7.58.0-2ubuntu3.15",
        "7.58.0-2ubuntu3.16",
        "7.58.0-2ubuntu3.17",
        "7.58.0-2ubuntu3.18",
        "7.58.0-2ubuntu3.19",
        "7.58.0-2ubuntu3.20",
        "7.58.0-2ubuntu3.21",
        "7.58.0-2ubuntu3.22",
        "7.58.0-2ubuntu3.23",
        "7.58.0-2ubuntu3.24",
        "7.58.0-2ubuntu3.24+esm1",
        "7.58.0-2ubuntu3.24+esm2",
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    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "curl",
            "binary_version": "7.68.0-1ubuntu2.25+esm10"
          },
          {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.68.0-1ubuntu2.25+esm10"
          },
          {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.68.0-1ubuntu2.25+esm10"
          },
          {
            "binary_name": "libcurl4",
            "binary_version": "7.68.0-1ubuntu2.25+esm10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "curl",
        "purl": "pkg:deb/ubuntu/curl@7.68.0-1ubuntu2.25+esm10?arch=source\u0026distro=esm-infra/focal"
      },
      "ranges": [
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            {
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          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.65.3-1ubuntu3",
        "7.65.3-1ubuntu4",
        "7.66.0-1ubuntu1",
        "7.67.0-2ubuntu1",
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        "7.68.0-1ubuntu2",
        "7.68.0-1ubuntu2.1",
        "7.68.0-1ubuntu2.2",
        "7.68.0-1ubuntu2.4",
        "7.68.0-1ubuntu2.5",
        "7.68.0-1ubuntu2.6",
        "7.68.0-1ubuntu2.7",
        "7.68.0-1ubuntu2.10",
        "7.68.0-1ubuntu2.11",
        "7.68.0-1ubuntu2.12",
        "7.68.0-1ubuntu2.13",
        "7.68.0-1ubuntu2.14",
        "7.68.0-1ubuntu2.15",
        "7.68.0-1ubuntu2.16",
        "7.68.0-1ubuntu2.18",
        "7.68.0-1ubuntu2.19",
        "7.68.0-1ubuntu2.20",
        "7.68.0-1ubuntu2.21",
        "7.68.0-1ubuntu2.22",
        "7.68.0-1ubuntu2.23",
        "7.68.0-1ubuntu2.24",
        "7.68.0-1ubuntu2.25",
        "7.68.0-1ubuntu2.25+esm2",
        "7.68.0-1ubuntu2.25+esm3",
        "7.68.0-1ubuntu2.25+esm4",
        "7.68.0-1ubuntu2.25+esm5",
        "7.68.0-1ubuntu2.25+esm6",
        "7.68.0-1ubuntu2.25+esm7",
        "7.68.0-1ubuntu2.25+esm9"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "curl",
            "binary_version": "7.81.0-1ubuntu1.30"
          },
          {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.81.0-1ubuntu1.30"
          },
          {
            "binary_name": "libcurl3-nss",
            "binary_version": "7.81.0-1ubuntu1.30"
          },
          {
            "binary_name": "libcurl4",
            "binary_version": "7.81.0-1ubuntu1.30"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "curl",
        "purl": "pkg:deb/ubuntu/curl@7.81.0-1ubuntu1.30?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.81.0-1ubuntu1.30"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.74.0-1.3ubuntu2",
        "7.74.0-1.3ubuntu3",
        "7.80.0-3",
        "7.81.0-1",
        "7.81.0-1ubuntu1.1",
        "7.81.0-1ubuntu1.2",
        "7.81.0-1ubuntu1.3",
        "7.81.0-1ubuntu1.4",
        "7.81.0-1ubuntu1.6",
        "7.81.0-1ubuntu1.7",
        "7.81.0-1ubuntu1.8",
        "7.81.0-1ubuntu1.10",
        "7.81.0-1ubuntu1.11",
        "7.81.0-1ubuntu1.13",
        "7.81.0-1ubuntu1.14",
        "7.81.0-1ubuntu1.15",
        "7.81.0-1ubuntu1.16",
        "7.81.0-1ubuntu1.17",
        "7.81.0-1ubuntu1.18",
        "7.81.0-1ubuntu1.19",
        "7.81.0-1ubuntu1.20",
        "7.81.0-1ubuntu1.21",
        "7.81.0-1ubuntu1.22",
        "7.81.0-1ubuntu1.23",
        "7.81.0-1ubuntu1.24",
        "7.81.0-1ubuntu1.25",
        "7.81.0-1ubuntu1.26",
        "7.81.0-1ubuntu1.27",
        "7.81.0-1ubuntu1.29"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "curl",
            "binary_version": "8.5.0-2ubuntu10.16"
          },
          {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.5.0-2ubuntu10.16"
          },
          {
            "binary_name": "libcurl4t64",
            "binary_version": "8.5.0-2ubuntu10.16"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "curl",
        "purl": "pkg:deb/ubuntu/curl@8.5.0-2ubuntu10.16?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.5.0-2ubuntu10.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.2.1-1ubuntu3",
        "8.2.1-1ubuntu3.1",
        "8.4.0-2ubuntu1",
        "8.5.0-2ubuntu1",
        "8.5.0-2ubuntu2",
        "8.5.0-2ubuntu8",
        "8.5.0-2ubuntu9",
        "8.5.0-2ubuntu10",
        "8.5.0-2ubuntu10.1",
        "8.5.0-2ubuntu10.2",
        "8.5.0-2ubuntu10.3",
        "8.5.0-2ubuntu10.4",
        "8.5.0-2ubuntu10.5",
        "8.5.0-2ubuntu10.6",
        "8.5.0-2ubuntu10.7",
        "8.5.0-2ubuntu10.8",
        "8.5.0-2ubuntu10.9",
        "8.5.0-2ubuntu10.10",
        "8.5.0-2ubuntu10.11",
        "8.5.0-2ubuntu10.12",
        "8.5.0-2ubuntu10.13",
        "8.5.0-2ubuntu10.15"
      ]
    }
  ],
  "aliases": [],
  "details": "Stanislav Fort discovered that curl did not properly clear AWS SigV4\nauthentication state when CURLOPT_AWS_SIGV4 was set to NULL. An attacker\ncould possibly use this issue to obtain sensitive information. This\nissue only affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS.\n(CVE-2026-86409)\n\nStanislav Fort discovered that an HTTP proxy could trick libcurl into\nsending credentials to the proxy itself by responding to a CONNECT\nrequest with an unexpected authentication challenge. An attacker could\npossibly use this issue to obtain sensitive information.\n(CVE-2026-86414)\n\nStanislav Fort discovered that curl did not correctly handle HSTS\nentries when an includeSubDomains parent entry was imported before a\nlonger-lived child entry. An attacker could possibly use this issue to\ncause curl to use unencrypted HTTP connections. This issue only affected\nUbuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-87862)\n\nStanislav Fort discovered that curl did not properly handle HSTS max-age\nvalues that exceeded calendar time structure bounds. An attacker could\npossibly use this issue to cause a denial of service or data loss. This\nissue only affected Ubuntu 24.04 LTS. (CVE-2026-87863)\n\nStanislav Fort discovered that curl did not properly handle IMAP APPEND\ncommands when CURLOPT_CRLF was enabled, allowing overflow bytes to be\ninterpreted as pipelined commands. An authenticated attacker could\npossibly use this issue to inject arbitrary IMAP commands.\n(CVE-2026-87864)\n\nJoshua Rogers discovered that libcurl had a use-after-free vulnerability\nin the FTP wildcard matching code. An attacker could possibly use this\nissue to cause curl to crash, resulting in a denial of service, or\nexecute arbitrary code. (CVE-2026-92388)\n\nJoshua Rogers discovered that libcurl\u0027s TFTP state machine did not\nproperly validate transfer directions, allowing a malicious server to\nforce the client into transmit mode. An attacker could possibly use this\nissue to obtain sensitive information. (CVE-2026-92389)\n\nJoshua Rogers discovered that curl had a stack overflow vulnerability\nwhen processing deeply nested MIME structures. An attacker could\npossibly use this issue to cause curl to crash, resulting in a denial of\nservice. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS,\nUbuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-92391)\n\nJoshua Rogers discovered that libcurl could expose credentials in the\nURL returned by CURLINFO_EFFECTIVE_URL when credentials were retrieved\nfrom a .netrc file. An attacker could possibly use this issue to obtain\nsensitive information. This issue only affected Ubuntu 20.04 LTS, Ubuntu\n22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-94266)",
  "id": "USN-8932-1",
  "modified": "2026-10-14T19:26:26Z",
  "published": "2026-10-14T19:26:26Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8932-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-86409"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-86414"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-87862"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-87863"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-87864"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-92388"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-92389"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-92391"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-94266"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "curl vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-86409",
    "UBUNTU-CVE-2026-86414",
    "UBUNTU-CVE-2026-87862",
    "UBUNTU-CVE-2026-87863",
    "UBUNTU-CVE-2026-87864",
    "UBUNTU-CVE-2026-92388",
    "UBUNTU-CVE-2026-92389",
    "UBUNTU-CVE-2026-92391",
    "UBUNTU-CVE-2026-94266"
  ]
}



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Tags
Taxonomy of the tags.





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.



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.