{"schema":"threatline.record/2","record":{"id":"CVE-2026-115693","aliases":[],"summary":"Custom cacerts or cacertfile do not restrict trust to the pinned CA in hackney","details":"Improper Certificate Validation vulnerability in hackney_ssl in benoitc hackney allows an on-path attacker to impersonate a server pinned to a private certificate authority via a certificate chain that ends in a publicly trusted root. hackney adds {partial_chain, fun hackney_ssl:partial_chain/1} to every verify_peer configuration. The callback returns any certificate in the peer chain whose public key matches a root in the bundled certifi store as the trust anchor, and OTP honours that callback over the configured cacerts. hackney_ssl:merge_ssl_opts/3 kept the callback when the caller replaced the trust store with cacerts or cacertfile in ssl_options, so a connection pinned to a private CA still accepted any chain that carried a publicly trusted root.\n\nThe hostname check still applies, so the attacker needs a publicly trusted certificate for the pinned hostname.\n\nThis issue affects hackney: from 1.24.0 before 4.9.0.","categories":["Unclassified"],"product":"hackney","vendor":"benoitc","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115693","source_modified_at":"2026-10-26T13:49:29.374Z","fetched_at":"2026-10-26T19:10:57.178988Z","product":"hackney","vendor":"benoitc","versions":[{"lessThan":"4.9.0","status":"affected","version":"1.24.0","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115693","source_modified_at":"2026-10-26T13:49:29.374Z","fetched_at":"2026-10-26T19:10:57.178988Z","product":"hackney","vendor":"benoitc","versions":[{"lessThan":"915eb5737e9c489d8fc22eec8cdae30e9b027be4","status":"affected","version":"d8a9afcf5c3849904274e2eba1df56c63d1a1a0c","versionType":"git"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115693","source_modified_at":"2026-10-26T13:49:29.374Z","fetched_at":"2026-10-26T19:10:57.178988Z","package":{"name":"hackney","ecosystem":null},"version":"4.9.0","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115693","source_modified_at":"2026-10-26T13:49:29.374Z","fetched_at":"2026-10-26T19:10:57.178988Z","package":{"name":"hackney","ecosystem":null},"version":"915eb5737e9c489d8fc22eec8cdae30e9b027be4","basis":"first unaffected version stated in the CVE record"}],"cvss":9.1,"severity":"Critical","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-26T13:49:29.374Z","modified_at":"2026-10-26T13:49:29.374Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-115693","fetched_at":"2026-10-26T19:10:57.178988Z","source_modified_at":"2026-10-26T13:49:29.374Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/benoitc/hackney/pull/978","tags":["related"]},{"source":"CVE List","url":"https://cna.erlef.org/cves/CVE-2026-115693.html","tags":["related"]},{"source":"CVE List","url":"https://osv.dev/vulnerability/EEF-CVE-2026-115693","tags":["related"]},{"source":"CVE List","url":"https://github.com/benoitc/hackney/releases/tag/4.9.0","tags":["vendor-advisory","related"]},{"source":"CVE List","url":"https://github.com/benoitc/hackney/commit/d8a9afcf5c3849904274e2eba1df56c63d1a1a0c","tags":["related"]},{"source":"CVE List","url":"https://github.com/benoitc/hackney/commit/915eb5737e9c489d8fc22eec8cdae30e9b027be4","tags":["patch"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-26T13:49:29.374Z","content_hash":"26c3913d4eb4edfe96b4a0e6c24c0baddd7abcdc51fd841f493f78aa0f5884e9"}}