{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "incident": { "id": "cve-2026-87866", "url": "https://cveboard.org/i/cve-2026-87866", "urlPt": "https://cveboard.org/pt/i/cve-2026-87866", "json": "https://cveboard.org/i/cve-2026-87866.json", "kind": "vuln", "live": true, "knownExploited": false, "severity": "critical", "title": "curl curl", "summary": "When built with wolfSSL, curl can successfully validate a pinned public key hash against a key the TLS peer does not possess.", "titlePt": "curl curl", "summaryPt": "Quando construído com wolfSSL, o curl pode validar com sucesso um hash de chave pública fixa contra uma chave que o par TLS não possui.", "affected": [ { "vendor": "curl", "product": "curl", "defaultStatus": "unaffected", "versions": [ { "version": "8.22.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.22.0" }, { "version": "8.21.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.21.0" }, { "version": "8.20.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.20.0" }, { "version": "8.19.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.19.0" }, { "version": "8.18.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.18.0" }, { "version": "8.17.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.17.0" }, { "version": "8.16.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.16.0" }, { "version": "8.15.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.15.0" }, { "version": "8.14.1", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.14.1" }, { "version": "8.14.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.14.0" }, { "version": "8.13.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.13.0" }, { "version": "8.12.1", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.12.1" }, { "version": "8.12.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.12.0" }, { "version": "8.11.1", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.11.1" }, { "version": "8.11.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.11.0" }, { "version": "8.10.1", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.10.1" }, { "version": "8.10.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.10.0" }, { "version": "8.9.1", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.9.1" }, { "version": "8.9.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.9.0" }, { "version": "8.8.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.8.0" }, { "version": "8.7.1", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.7.1" }, { "version": "8.7.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.7.0" }, { "version": "8.6.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.6.0" }, { "version": "8.5.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.5.0" }, { "version": "8.4.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.4.0" }, { "version": "8.3.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.3.0" }, { "version": "8.2.1", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.2.1" }, { "version": "8.2.0", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.2.0" }, { "version": "8.1.2", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.1.2" }, { "version": "8.1.1", "status": "affected", "lessThan": null, "lessThanOrEqual": "8.1.1" } ], "omitted": 70, "fixed": [] } ], "omitted": 70, "references": [ { "url": "https://hackerone.com/reports/3989514", "tag": "exploit" } ], "cwes": [ { "id": "CWE-295", "name": "Improper Certificate Validation" } ], "ssvc": { "exploitation": "poc", "automatable": "yes", "impact": "total", "at": "2026-10-29T18:58:30.759Z" }, "fix": "none", "tags": [ "curl" ], "description": "When built with wolfSSL, curl can successfully validate a pinned public key\nhash against a key the TLS peer does not possess. During the TLS handshake,\nwolfSSL validates the connection, but curl's subsequent re-parsing of the same\ncertificate - tricked by a manipulated validity length field - extracts and\nmatches a different embedded key, incorrectly authorizing the pinned public\nkey.", "descriptionFrom": "cve", "descriptionAt": null, "summaryFrom": "cve", "cves": [ "CVE-2026-87866" ], "ghsa": null, "cvss": { "score": 9.1, "version": "3.1", "by": "CISA-ADP" }, "epss": { "percentage": 0.00208, "percentile": 0.10917, "asOf": "2026-10-29", "by": "FIRST" }, "packages": [], "vendor": "curl", "product": "curl", "kev": null, "breach": null, "retracted": false, "sources": [ { "label": "cve.now", "url": "https://cve.now/CVE-2026-87866" } ], "cveVersion": 1, "cvePending": false, "publishedAt": "2026-10-20T20:16:30.866Z", "updatedAt": "2026-10-20T20:16:30.866Z" }, "live": true, "events": [ { "id": "cvenow:CVE-2026-87866:cvenow_discovered:first", "incidentId": "cve-2026-87866", "type": "cvenow_discovered", "at": "2026-10-20T20:16:30.866Z", "detail": {} } ] }