{"id":"CVE-2026-87866","aliases":[],"cve":{"records":[{"id":"CVE-2026-87866","source":"curl","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-09T13:17:42.764Z","published":"2026-10-20T20:16:30.866Z","modified":"2026-10-29T18:59:00.981Z"}],"publishers":[{"name":"curl","role":"CNA","organizationId":"2499f714-1537-4658-8207-48ae4bb9eae9","modified":"2026-10-20T20:16:30.866Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T18:59:00.981Z"}],"references":[{"url":"https://curl.se/docs/CVE-2026-87866.json","tags":[],"source":"curl"},{"url":"https://curl.se/docs/CVE-2026-87866.html","tags":[],"source":"curl"},{"url":"https://hackerone.com/reports/3989514","tags":[],"source":"curl"},{"url":"https://hackerone.com/reports/3989514","tags":["exploit"],"source":"CISA-ADP"}],"weaknesses":[{"id":"CWE-295","description":"CWE-295 Improper Certificate Validation","source":"CISA-ADP"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T18:58:30.759022Z","decisions":[{"name":"Exploitation","value":"poc"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"total"}]}]},"title":"wolfSSL public-key pinning bypass","titleSource":"curl","descriptionSource":"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.","score":9.1,"severity":"critical","published":"2026-10-20T20:16:30.866Z","modified":"2026-10-29T18:59:00.981Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"curl","name":"curl","platforms":[],"versions":[{"version":"8.22.0","status":"affected","lessThanOrEqual":"8.22.0","versionType":"semver"},{"version":"8.21.0","status":"affected","lessThanOrEqual":"8.21.0","versionType":"semver"},{"version":"8.20.0","status":"affected","lessThanOrEqual":"8.20.0","versionType":"semver"},{"version":"8.19.0","status":"affected","lessThanOrEqual":"8.19.0","versionType":"semver"},{"version":"8.18.0","status":"affected","lessThanOrEqual":"8.18.0","versionType":"semver"},{"version":"8.17.0","status":"affected","lessThanOrEqual":"8.17.0","versionType":"semver"},{"version":"8.16.0","status":"affected","lessThanOrEqual":"8.16.0","versionType":"semver"},{"version":"8.15.0","status":"affected","lessThanOrEqual":"8.15.0","versionType":"semver"},{"version":"8.14.1","status":"affected","lessThanOrEqual":"8.14.1","versionType":"semver"},{"version":"8.14.0","status":"affected","lessThanOrEqual":"8.14.0","versionType":"semver"},{"version":"8.13.0","status":"affected","lessThanOrEqual":"8.13.0","versionType":"semver"},{"version":"8.12.1","status":"affected","lessThanOrEqual":"8.12.1","versionType":"semver"},{"version":"8.12.0","status":"affected","lessThanOrEqual":"8.12.0","versionType":"semver"},{"version":"8.11.1","status":"affected","lessThanOrEqual":"8.11.1","versionType":"semver"},{"version":"8.11.0","status":"affected","lessThanOrEqual":"8.11.0","versionType":"semver"},{"version":"8.10.1","status":"affected","lessThanOrEqual":"8.10.1","versionType":"semver"},{"version":"8.10.0","status":"affected","lessThanOrEqual":"8.10.0","versionType":"semver"},{"version":"8.9.1","status":"affected","lessThanOrEqual":"8.9.1","versionType":"semver"},{"version":"8.9.0","status":"affected","lessThanOrEqual":"8.9.0","versionType":"semver"},{"version":"8.8.0","status":"affected","lessThanOrEqual":"8.8.0","versionType":"semver"},{"version":"8.7.1","status":"affected","lessThanOrEqual":"8.7.1","versionType":"semver"},{"version":"8.7.0","status":"affected","lessThanOrEqual":"8.7.0","versionType":"semver"},{"version":"8.6.0","status":"affected","lessThanOrEqual":"8.6.0","versionType":"semver"},{"version":"8.5.0","status":"affected","lessThanOrEqual":"8.5.0","versionType":"semver"},{"version":"8.4.0","status":"affected","lessThanOrEqual":"8.4.0","versionType":"semver"},{"version":"8.3.0","status":"affected","lessThanOrEqual":"8.3.0","versionType":"semver"},{"version":"8.2.1","status":"affected","lessThanOrEqual":"8.2.1","versionType":"semver"},{"version":"8.2.0","status":"affected","lessThanOrEqual":"8.2.0","versionType":"semver"},{"version":"8.1.2","status":"affected","lessThanOrEqual":"8.1.2","versionType":"semver"},{"version":"8.1.1","status":"affected","lessThanOrEqual":"8.1.1","versionType":"semver"},{"version":"8.1.0","status":"affected","lessThanOrEqual":"8.1.0","versionType":"semver"},{"version":"8.0.1","status":"affected","lessThanOrEqual":"8.0.1","versionType":"semver"},{"version":"8.0.0","status":"affected","lessThanOrEqual":"8.0.0","versionType":"semver"},{"version":"7.88.1","status":"affected","lessThanOrEqual":"7.88.1","versionType":"semver"},{"version":"7.88.0","status":"affected","lessThanOrEqual":"7.88.0","versionType":"semver"},{"version":"7.87.0","status":"affected","lessThanOrEqual":"7.87.0","versionType":"semver"},{"version":"7.86.0","status":"affected","lessThanOrEqual":"7.86.0","versionType":"semver"},{"version":"7.85.0","status":"affected","lessThanOrEqual":"7.85.0","versionType":"semver"},{"version":"7.84.0","status":"affected","lessThanOrEqual":"7.84.0","versionType":"semver"},{"version":"7.83.1","status":"affected","lessThanOrEqual":"7.83.1","versionType":"semver"},{"version":"7.83.0","status":"affected","lessThanOrEqual":"7.83.0","versionType":"semver"},{"version":"7.82.0","status":"affected","lessThanOrEqual":"7.82.0","versionType":"semver"},{"version":"7.81.0","status":"affected","lessThanOrEqual":"7.81.0","versionType":"semver"},{"version":"7.80.0","status":"affected","lessThanOrEqual":"7.80.0","versionType":"semver"},{"version":"7.79.1","status":"affected","lessThanOrEqual":"7.79.1","versionType":"semver"},{"version":"7.79.0","status":"affected","lessThanOrEqual":"7.79.0","versionType":"semver"},{"version":"7.78.0","status":"affected","lessThanOrEqual":"7.78.0","versionType":"semver"},{"version":"7.77.0","status":"affected","lessThanOrEqual":"7.77.0","versionType":"semver"},{"version":"7.76.1","status":"affected","lessThanOrEqual":"7.76.1","versionType":"semver"},{"version":"7.76.0","status":"affected","lessThanOrEqual":"7.76.0","versionType":"semver"},{"version":"7.75.0","status":"affected","lessThanOrEqual":"7.75.0","versionType":"semver"},{"version":"7.74.0","status":"affected","lessThanOrEqual":"7.74.0","versionType":"semver"},{"version":"7.73.0","status":"affected","lessThanOrEqual":"7.73.0","versionType":"semver"},{"version":"7.72.0","status":"affected","lessThanOrEqual":"7.72.0","versionType":"semver"},{"version":"7.71.1","status":"affected","lessThanOrEqual":"7.71.1","versionType":"semver"},{"version":"7.71.0","status":"affected","lessThanOrEqual":"7.71.0","versionType":"semver"},{"version":"7.70.0","status":"affected","lessThanOrEqual":"7.70.0","versionType":"semver"},{"version":"7.69.1","status":"affected","lessThanOrEqual":"7.69.1","versionType":"semver"},{"version":"7.69.0","status":"affected","lessThanOrEqual":"7.69.0","versionType":"semver"},{"version":"7.68.0","status":"affected","lessThanOrEqual":"7.68.0","versionType":"semver"},{"version":"7.67.0","status":"affected","lessThanOrEqual":"7.67.0","versionType":"semver"},{"version":"7.66.0","status":"affected","lessThanOrEqual":"7.66.0","versionType":"semver"},{"version":"7.65.3","status":"affected","lessThanOrEqual":"7.65.3","versionType":"semver"},{"version":"7.65.2","status":"affected","lessThanOrEqual":"7.65.2","versionType":"semver"},{"version":"7.65.1","status":"affected","lessThanOrEqual":"7.65.1","versionType":"semver"},{"version":"7.65.0","status":"affected","lessThanOrEqual":"7.65.0","versionType":"semver"},{"version":"7.64.1","status":"affected","lessThanOrEqual":"7.64.1","versionType":"semver"},{"version":"7.64.0","status":"affected","lessThanOrEqual":"7.64.0","versionType":"semver"},{"version":"7.63.0","status":"affected","lessThanOrEqual":"7.63.0","versionType":"semver"},{"version":"7.62.0","status":"affected","lessThanOrEqual":"7.62.0","versionType":"semver"},{"version":"7.61.1","status":"affected","lessThanOrEqual":"7.61.1","versionType":"semver"},{"version":"7.61.0","status":"affected","lessThanOrEqual":"7.61.0","versionType":"semver"},{"version":"7.60.0","status":"affected","lessThanOrEqual":"7.60.0","versionType":"semver"},{"version":"7.59.0","status":"affected","lessThanOrEqual":"7.59.0","versionType":"semver"},{"version":"7.58.0","status":"affected","lessThanOrEqual":"7.58.0","versionType":"semver"},{"version":"7.57.0","status":"affected","lessThanOrEqual":"7.57.0","versionType":"semver"},{"version":"7.56.1","status":"affected","lessThanOrEqual":"7.56.1","versionType":"semver"},{"version":"7.56.0","status":"affected","lessThanOrEqual":"7.56.0","versionType":"semver"},{"version":"7.55.1","status":"affected","lessThanOrEqual":"7.55.1","versionType":"semver"},{"version":"7.55.0","status":"affected","lessThanOrEqual":"7.55.0","versionType":"semver"},{"version":"7.54.1","status":"affected","lessThanOrEqual":"7.54.1","versionType":"semver"},{"version":"7.54.0","status":"affected","lessThanOrEqual":"7.54.0","versionType":"semver"},{"version":"7.53.1","status":"affected","lessThanOrEqual":"7.53.1","versionType":"semver"},{"version":"7.53.0","status":"affected","lessThanOrEqual":"7.53.0","versionType":"semver"},{"version":"7.52.1","status":"affected","lessThanOrEqual":"7.52.1","versionType":"semver"},{"version":"7.52.0","status":"affected","lessThanOrEqual":"7.52.0","versionType":"semver"},{"version":"7.51.0","status":"affected","lessThanOrEqual":"7.51.0","versionType":"semver"},{"version":"7.50.3","status":"affected","lessThanOrEqual":"7.50.3","versionType":"semver"},{"version":"7.50.2","status":"affected","lessThanOrEqual":"7.50.2","versionType":"semver"},{"version":"7.50.1","status":"affected","lessThanOrEqual":"7.50.1","versionType":"semver"},{"version":"7.50.0","status":"affected","lessThanOrEqual":"7.50.0","versionType":"semver"},{"version":"7.49.1","status":"affected","lessThanOrEqual":"7.49.1","versionType":"semver"},{"version":"7.49.0","status":"affected","lessThanOrEqual":"7.49.0","versionType":"semver"},{"version":"7.48.0","status":"affected","lessThanOrEqual":"7.48.0","versionType":"semver"},{"version":"7.47.1","status":"affected","lessThanOrEqual":"7.47.1","versionType":"semver"},{"version":"7.47.0","status":"affected","lessThanOrEqual":"7.47.0","versionType":"semver"},{"version":"7.46.0","status":"affected","lessThanOrEqual":"7.46.0","versionType":"semver"},{"version":"7.45.0","status":"affected","lessThanOrEqual":"7.45.0","versionType":"semver"},{"version":"7.44.0","status":"affected","lessThanOrEqual":"7.44.0","versionType":"semver"},{"version":"7.43.0","status":"affected","lessThanOrEqual":"7.43.0","versionType":"semver"}],"defaultStatus":"unaffected","cpes":[],"source":"curl","url":"https://www.cve.org/CVERecord?id=CVE-2026-87866"}],"remediation":[],"references":["https://curl.se/docs/CVE-2026-87866.json","https://curl.se/docs/CVE-2026-87866.html","https://hackerone.com/reports/3989514"],"sources":[{"name":"CVE","id":"CVE-2026-87866","modified":"2026-10-29T18:59:00.981Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-87866"}],"assessments":[{"source":"CISA-ADP","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1}],"sourceAffected":[],"observedAt":"2026-10-29T19:22:08.172Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T01:05:34.749Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-29T19:25:33.419Z","attemptedAt":"2026-10-29T19:25:33.419Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-29T19:25:32.578Z","attemptedAt":"2026-10-29T19:25:32.578Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-29T19:25:33.569Z","attemptedAt":"2026-10-29T19:25:33.569Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-29T19:25:33.286Z","attemptedAt":"2026-10-29T19:25:33.286Z"}],"evidence":[{"source":"GitHub Advisory Database","id":"GHSA-wq9f-qmpx-2cc8","url":"https://github.com/advisories/GHSA-wq9f-qmpx-2cc8","modified":"2026-10-20T21:31:16Z","checkedAt":"2026-10-29T19:25:32.578Z"},{"source":"FIRST EPSS","id":"CVE-2026-87866","url":"https://www.first.org/epss/","probability":0.00208,"percentile":0.10917,"date":"2026-10-29","checkedAt":"2026-10-29T19:25:33.286Z"},{"source":"NVD","id":"CVE-2026-87866","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-87866","modified":"2026-10-29T19:17:27.917","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","checkedAt":"2026-10-29T19:25:33.419Z"},{"source":"ENISA EUVD","id":"EUVD-2026-105314","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-105314","modified":"Oct 20, 2026, 8:16:30 PM","checkedAt":"2026-10-29T19:25:33.569Z"}],"aiSummary":null}