GHSA-vmh5-mc38-953g

Source

https://github.com/advisories/GHSA-vmh5-mc38-953g

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-vmh5-mc38-953g/GHSA-vmh5-mc38-953g.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-vmh5-mc38-953g

Aliases

CVE-2026-9697

Related

CGA-6fr8-38f7-7rw8

Published

2026-06-18T14:28:21Z

Modified

2026-06-19T19:59:15.993814150Z

Severity

7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator

Summary

undici vulnerable to TLS certificate validation bypass via dropped requestTls in SOCKS5 ProxyAgent

Details

Impact

undici'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.

Applications 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.

Affected 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.

Patches

Upgrade to undici v7.28.0 or v8.5.0.

Workarounds

No 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.

Database specific

{
    "nvd_published_at": "2026-06-17T18:18:06Z",
    "github_reviewed_at": "2026-06-18T14:28:21Z",
    "github_reviewed": true,
    "severity": "HIGH",
    "cwe_ids": [
        "CWE-295"
    ]
}

References

Affected packages

npm / undici

Package

Name: undici; View open source insights on deps.dev
Purl: pkg:npm/undici

Affected 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"

npm / undici

Package

Name: undici; View open source insights on deps.dev
Purl: pkg:npm/undici

Affected 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"