{"schema_version":"1.7.5","id":"GHSA-vmh5-mc38-953g","published":"2026-06-18T14:28:21Z","modified":"2026-06-19T19:59:15.993814150Z","aliases":["CVE-2026-9697"],"related":["CGA-6fr8-38f7-7rw8"],"summary":"undici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 ProxyAgent","details":"## Impact\n\nundici's `ProxyAgent` silently drops the `requestTls` option when configured with a SOCKS5 proxy URI (`socks5://` or `socks://`). The target HTTPS connection through the SOCKS5 tunnel falls back to Node's default trust store, ignoring user-configured `ca`, `cert`, `key`, `rejectUnauthorized`, and `servername` settings.\n\nApplications that pin to an internal or corporate CA via `requestTls.ca` will, when their proxy URI is SOCKS5, get the default Mozilla CA bundle as the trust anchor instead. Any cert signed by any publicly-trusted CA for the target hostname is accepted, breaking the intended pin and enabling MITM read and tamper of the HTTPS exchange.\n\nAffected applications are those that use undici's `ProxyAgent` (or `Socks5ProxyAgent` directly) with SOCKS5 AND rely on `requestTls` for TLS scope restriction. The bug was introduced in undici 7.23.0 when SOCKS5 support was added.\n\n## Patches\n\nUpgrade to undici v7.28.0 or v8.5.0.\n\n## Workarounds\n\nNo workaround is available within the SOCKS5 path. If a SOCKS5 proxy with TLS scope restriction is required and an upgrade is not yet possible, route the traffic through an HTTP-proxy `ProxyAgent` instead, where `requestTls` is honored correctly.","affected":[{"package":{"name":"undici","ecosystem":"npm","purl":"pkg:npm/undici"},"ranges":[{"type":"SEMVER","events":[{"introduced":"7.23.0"},{"fixed":"7.28.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-vmh5-mc38-953g/GHSA-vmh5-mc38-953g.json"}},{"package":{"name":"undici","ecosystem":"npm","purl":"pkg:npm/undici"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.5.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-vmh5-mc38-953g/GHSA-vmh5-mc38-953g.json"}}],"references":[{"type":"WEB","url":"https://github.com/nodejs/undici/security/advisories/GHSA-vmh5-mc38-953g"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9697"},{"type":"WEB","url":"https://cna.openjsf.org/security-advisories.html"},{"type":"PACKAGE","url":"https://github.com/nodejs/undici"}],"database_specific":{"cwe_ids":["CWE-295"],"github_reviewed":true,"github_reviewed_at":"2026-06-18T14:28:21Z","nvd_published_at":"2026-06-17T18:18:06Z","severity":"HIGH"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}