USN-8927-1 (UBUNTU-CVE-2026-86409)

Vulnerability from osv_ubuntu – Published: 2026-10-14 11:58 – Updated: 2026-10-14 11:58 – Source website
VLAI
Summary
curl vulnerabilities
Details

It was discovered that curl, when built with GnuTLS support, had an out-of-bounds read in the WebSocket send path. An attacker could possibly use this issue to obtain sensitive information. (CVE-2026-107928)

Maksim discovered that curl did not correctly include the interface binding in connection reuse decisions when CURLOPT_INTERFACE was used. An attacker could possibly use this issue to cause connections to go out from an unintended source address. (CVE-2026-107929)

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. (CVE-2026-86409)

Stanislav Fort discovered that the curl command line tool did not set SSH host verification options when following redirects to SFTP or SCP URLs. An attacker could possibly use this issue to perform machine-in-the-middle attacks. (CVE-2026-86410)

Stanislav Fort discovered that curl did not properly handle cookie jar entries that could not be reloaded. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-86412)

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. (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. (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)

Bobbeh Rhino discovered that libcurl, when used with libssh2 and a hashed known_hosts file, could misreport a host key mismatch as a missing key. An attacker could possibly use this issue to perform machine-in-the-middle attacks. (CVE-2026-87865)

Joshua Rogers discovered that curl did not properly handle long cookie entries written to a Netscape cookie jar. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-92386)

Joshua Rogers discovered that a malicious FTP, IMAP, POP3, or SMTP server could cause libcurl to block indefinitely by omitting the final control-response line. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-92387)

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 did not properly enforce its file overwrite protection when using --remote-header-name in certain circumstances. An attacker could possibly use this issue to overwrite local files. (CVE-2026-92390)

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. (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. (CVE-2026-94266)

Joshua Rogers discovered that libcurl had a use-after-free vulnerability during HTTP/2 uploads when handling RST_STREAM responses from the server. An attacker could possibly use this issue to cause curl to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-92392)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-86409",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-86410",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-86412",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-86414",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-87862",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-87863",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-87864",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-87865",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-92386",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-92387",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-92388",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-92389",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-92390",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-92391",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-92392",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-94266",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-107928",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-107929",
              "severity": [
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "curl",
            "binary_version": "8.18.0-1ubuntu2.8"
          },
          {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.18.0-1ubuntu2.8"
          },
          {
            "binary_name": "libcurl4t64",
            "binary_version": "8.18.0-1ubuntu2.8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "curl",
        "purl": "pkg:deb/ubuntu/curl@8.18.0-1ubuntu2.8?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.18.0-1ubuntu2.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.14.1-2ubuntu1",
        "8.17.0-1ubuntu1",
        "8.18.0-1ubuntu1",
        "8.18.0-1ubuntu2",
        "8.18.0-1ubuntu2.1",
        "8.18.0-1ubuntu2.2",
        "8.18.0-1ubuntu2.3",
        "8.18.0-1ubuntu2.4",
        "8.18.0-1ubuntu2.5",
        "8.18.0-1ubuntu2.7"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that curl, when built with GnuTLS support, had an\nout-of-bounds read in the WebSocket send path. An attacker could\npossibly use this issue to obtain sensitive information.\n(CVE-2026-107928)\n\nMaksim discovered that curl did not correctly include the interface\nbinding in connection reuse decisions when CURLOPT_INTERFACE was used.\nAn attacker could possibly use this issue to cause connections to go\nout from an unintended source address. (CVE-2026-107929)\n\nStanislav Fort discovered that curl did not properly clear AWS SigV4\nauthentication state when CURLOPT_AWS_SIGV4 was set to NULL. An\nattacker could possibly use this issue to obtain sensitive information.\n(CVE-2026-86409)\n\nStanislav Fort discovered that the curl command line tool did not set\nSSH host verification options when following redirects to SFTP or SCP\nURLs. An attacker could possibly use this issue to perform\nmachine-in-the-middle attacks. (CVE-2026-86410)\n\nStanislav Fort discovered that curl did not properly handle cookie jar\nentries that could not be reloaded. An attacker could possibly use this\nissue to cause a denial of service. (CVE-2026-86412)\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. (CVE-2026-87862)\n\nStanislav Fort discovered that curl did not properly handle HSTS\nmax-age values that exceeded calendar time structure bounds. An\nattacker could possibly use this issue to cause a denial of service or\ndata loss. (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\nBobbeh Rhino discovered that libcurl, when used with libssh2 and a\nhashed known_hosts file, could misreport a host key mismatch as a\nmissing key. An attacker could possibly use this issue to perform\nmachine-in-the-middle attacks. (CVE-2026-87865)\n\nJoshua Rogers discovered that curl did not properly handle long cookie\nentries written to a Netscape cookie jar. An attacker could possibly\nuse this issue to cause a denial of service. (CVE-2026-92386)\n\nJoshua Rogers discovered that a malicious FTP, IMAP, POP3, or SMTP\nserver could cause libcurl to block indefinitely by omitting the final\ncontrol-response line. An attacker could possibly use this issue to\ncause a denial of service. (CVE-2026-92387)\n\nJoshua Rogers discovered that libcurl had a use-after-free\nvulnerability in the FTP wildcard matching code. An attacker could\npossibly use this issue to cause curl to crash, resulting in a denial\nof service, or execute 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\nthis issue to obtain sensitive information. (CVE-2026-92389)\n\nJoshua Rogers discovered that curl did not properly enforce its file\noverwrite protection when using --remote-header-name in certain\ncircumstances. An attacker could possibly use this issue to overwrite\nlocal files. (CVE-2026-92390)\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\nof service. (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. (CVE-2026-94266)\n\nJoshua Rogers discovered that libcurl had a use-after-free\nvulnerability during HTTP/2 uploads when handling RST_STREAM responses\nfrom the server. An attacker could possibly use this issue to cause\ncurl to crash, resulting in a denial of service, or execute arbitrary\ncode. (CVE-2026-92392)",
  "id": "USN-8927-1",
  "modified": "2026-10-14T11:58:06Z",
  "published": "2026-10-14T11:58:06Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8927-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-86409"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-86410"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-86412"
    },
    {
      "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-2026-87865"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-92386"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-92387"
    },
    {
      "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-2026-92390"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-92391"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-92392"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-94266"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-107928"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-107929"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "curl vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2026-86409",
    "UBUNTU-CVE-2026-86410",
    "UBUNTU-CVE-2026-86412",
    "UBUNTU-CVE-2026-86414",
    "UBUNTU-CVE-2026-87862",
    "UBUNTU-CVE-2026-87863",
    "UBUNTU-CVE-2026-87864",
    "UBUNTU-CVE-2026-87865",
    "UBUNTU-CVE-2026-92386",
    "UBUNTU-CVE-2026-92387",
    "UBUNTU-CVE-2026-92388",
    "UBUNTU-CVE-2026-92389",
    "UBUNTU-CVE-2026-92390",
    "UBUNTU-CVE-2026-92391",
    "UBUNTU-CVE-2026-92392",
    "UBUNTU-CVE-2026-94266",
    "UBUNTU-CVE-2026-107928",
    "UBUNTU-CVE-2026-107929"
  ]
}



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Sightings

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Nomenclature

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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