HSTS cache import drops longer-lived child

{
  "id": "5dbd7d030a69b875ce1bfae9996f99d34f811472cb08b11bc86d34463695051c",
  "url": "https://osv.dev/vulnerability/CURL-CVE-2026-87862",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HSTS cache import drops longer-lived child",
    "summary": "Importing a `includeSubDomains` parent HSTS entry before a longer-lived child entry, silently drops the child. Consequently, when the parent expires, the child's valid HSTS policy is lost, causing curl to issue unencrypted HTTP requests rather than upgrading to HTTPS.",
    "evidence": "osv:CURL-CVE-2026-87862",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CURL-CVE-2026-87862",
      "aliases": [
        "CURL-CVE-2026-87862",
        "CVE-2026-87862"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "8.11.0"
                },
                {
                  "fixed": "8.14.3"
                },
                {
                  "introduced": "8.15.0"
                },
                {
                  "fixed": "8.16.2"
                },
                {
                  "introduced": "8.17.0"
                },
                {
                  "fixed": "8.20.2"
                },
                {
                  "introduced": "8.21.0"
                },
                {
                  "fixed": "8.23.0"
                }
              ]
            },
            {
              "repo": "https://github.com/curl/curl.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a94973805df96269bf3f3bf0a20ccb9887313316"
                },
                {
                  "fixed": "a1614c3bcf1593eb524b37792124357d97a5429c"
                }
              ]
            }
          ],
          "versions": [
            "8.22.0",
            "8.21.0",
            "8.20.0",
            "8.19.0",
            "8.18.0",
            "8.17.0",
            "8.16.0",
            "8.15.0",
            "8.14.1",
            "8.14.0",
            "8.13.0",
            "8.12.1",
            "8.12.0",
            "8.11.1",
            "8.11.0",
            "curl-8_22_0",
            "rc-8_22_0-3",
            "rc-8_22_0-2",
            "rc-8_22_0-1",
            "curl-8_21_0",
            "rc-8_21_0-3",
            "rc-8_21_0-2",
            "rc-8_21_0-1",
            "curl-8_20_0",
            "rc-8_20_0-3",
            "rc-8_20_0-2",
            "rc-8_20_0-1",
            "curl-8_19_0",
            "rc-8_19_0-3",
            "rc-8_19_0-2",
            "rc-8_19_0-1",
            "curl-8_18_0",
            "rc-8_18_0-3",
            "rc-8_18_0-2",
            "rc-8_18_0-1",
            "curl-8_17_0",
            "curl-8_16_0",
            "curl-8_15_0",
            "curl-8_14_1",
            "curl-8_14_0",
            "curl-8_13_0",
            "curl-8_12_1",
            "curl-8_12_0",
            "curl-8_11_1",
            "curl-8_11_0"
          ],
          "database_specific": {
            "source": "https://curl.se/docs/CURL-CVE-2026-87862.json",
            "vanir_signatures": [
              {
                "id": "CURL-CVE-2026-87862-9ffd2bf3",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "224427400684326249590822012963350597075",
                    "2737065825097435213544451821822622621",
                    "214650631889071362966467564430717118548",
                    "116082283867178258548291069737951800414"
                  ]
                },
                "source": "https://github.com/curl/curl.git/commit/a1614c3bcf1593eb524b37792124357d97a5429c",
                "target": {
                  "file": "lib/hsts.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CURL-CVE-2026-87862-c6e9f2fa",
                "digest": {
                  "length": 966,
                  "function_hash": "256221136634413402692360369980878541334"
                },
                "source": "https://github.com/curl/curl.git/commit/a1614c3bcf1593eb524b37792124357d97a5429c",
                "target": {
                  "file": "lib/hsts.c",
                  "function": "hsts_add_host_expire"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-25T01:05:08Z"
          }
        }
      ],
      "modified": "2026-10-25T01:05:08.625456143Z",
      "provider": "osv",
      "references": [],
      "provider_metadata": {
        "CWE": {
          "id": "CWE-201",
          "desc": "Information Exposure Through Sent Data"
        },
        "URL": "https://curl.se/docs/CVE-2026-87862.json",
        "www": "https://curl.se/docs/CVE-2026-87862.html",
        "issue": "https://hackerone.com/reports/3972357",
        "affects": "both",
        "package": "curl",
        "severity": "Low",
        "last_affected": "8.22.0"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-87862",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 444337,
  "published_at": "2026-10-14T08:00:00+00:00"
}