UBUNTU-CVE-2026-92388 (CVE-2026-92388)

Vulnerability from osv_ubuntu – Published: 2026-10-14 06:00 – Updated: 2026-10-20 20:23 – Source website
VLAI
Details

When an FTP wildcard LIST operation fails, libcurl omits the restoration path meant for successful listings, leaving the write callback set to the internal listing parser and the write callback data pointing directly to the easy handle. Subsequent reuse of this handle triggers an immediate crash, and cloning it via curl_easy_duphandle() copies this corrupted state into the duplicate. If the original handle is subsequently freed, executing a transfer on the cloned handle causes a heap use-after-free read against the dangling handle reference; alternatively, reusing the original or cloned handle while reconfiguring only CURLOPT_WRITEDATA (and omitting CURLOPT_WRITEFUNCTION) results in type confusion, forcing the internal parser to interpret incoming server response bytes into memory at the application-supplied write data pointer.

Severity
N/A (UNKNOWN)
low
References
To clipboard 

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        "binaries": [
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          },
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          }
        ],
        "priority_reason": "Upstream defined this as low severity"
      },
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      },
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            "binary_name": "libcurl3-nss",
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          },
          {
            "binary_name": "libcurl4",
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        ],
        "priority_reason": "Upstream defined this as low severity"
      },
      "package": {
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        "7.58.0-2ubuntu3.24+esm2",
        "7.58.0-2ubuntu3.24+esm3",
        "7.58.0-2ubuntu3.24+esm4",
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    {
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            "binary_name": "libcurl3-gnutls",
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          {
            "binary_name": "libcurl3-nss",
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          },
          {
            "binary_name": "libcurl4",
            "binary_version": "7.68.0-1ubuntu2.25+esm10"
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        ],
        "priority_reason": "Upstream defined this as low severity"
      },
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      ]
    },
    {
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          {
            "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"
          }
        ],
        "priority_reason": "Upstream defined this as low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "curl",
        "purl": "pkg:deb/ubuntu/curl@7.81.0-1ubuntu1.30?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
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              "introduced": "0"
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            {
              "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"
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    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "curl",
            "binary_version": "8.5.0-2ubuntu10.16"
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          {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.5.0-2ubuntu10.16"
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          {
            "binary_name": "libcurl4t64",
            "binary_version": "8.5.0-2ubuntu10.16"
          }
        ],
        "priority_reason": "Upstream defined this as low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "curl",
        "purl": "pkg:deb/ubuntu/curl@8.5.0-2ubuntu10.16?arch=source\u0026distro=noble"
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    },
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        "availability": "No subscription required",
        "binaries": [
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            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.20.0-2ubuntu11.1"
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            "binary_name": "libcurl4t64",
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        ],
        "priority_reason": "Upstream defined this as low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
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      "versions": [
        "8.18.0-1ubuntu2",
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        "8.20.0-2ubuntu11"
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    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "curl",
            "binary_version": "8.18.0-1ubuntu2.8"
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          {
            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.18.0-1ubuntu2.8"
          },
          {
            "binary_name": "libcurl4t64",
            "binary_version": "8.18.0-1ubuntu2.8"
          }
        ],
        "priority_reason": "Upstream defined this as low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "curl",
        "purl": "pkg:deb/ubuntu/curl@8.18.0-1ubuntu2.8?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
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            {
              "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": "When an FTP wildcard `LIST` operation fails, libcurl omits the restoration path meant for successful listings, leaving the write callback set to the internal listing parser and the write callback data pointing directly to the easy handle. Subsequent reuse of this handle triggers an immediate crash, and cloning it via `curl_easy_duphandle()` copies this corrupted state into the duplicate. If the original handle is subsequently freed, executing a transfer on the cloned handle causes a heap use-after-free read against the dangling handle reference; alternatively, reusing the original or cloned handle while reconfiguring only `CURLOPT_WRITEDATA` (and omitting `CURLOPT_WRITEFUNCTION`) results in type confusion, forcing the internal parser to interpret incoming server response bytes into memory at the application-supplied write data pointer.",
  "id": "UBUNTU-CVE-2026-92388",
  "modified": "2026-10-20T20:23:52Z",
  "published": "2026-10-14T06:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-92388"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-92388"
    },
    {
      "type": "REPORT",
      "url": "https://curl.se/docs/CVE-2026-92388.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8927-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8927-2"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8932-1"
    }
  ],
  "related": [
    "USN-8927-1",
    "USN-8927-2",
    "USN-8932-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-92388"
  ]
}



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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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

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