CVE-2026-9697

Aliases:GHSA-vmh5-mc38-953g
Advisory lineage Upstream: 0 Downstream: 9
PUBLISHED
Published: 17 Jun 2026, 16:46
Last modified:21 Jul 2026, 12:05

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.4 HIGH
v3.1 (cve.org)
EPSS Score
0.43% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

17 Jun 2026, 16:46
Published
Vulnerability first disclosed
21 Jul 2026, 12:05
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Trends

Current EPSS score: 0.43%• Percentile: 35%

Techniques & Countermeasures

  • CWE-295•Improper Certificate Validation

    The product does not validate, or incorrectly validates, a certificate.

Affected Systems

  • Npm•undici

    ≥ 7.23.0, < 7.28.0 | ≥ 8.0.0, < 8.5.0

  • undici•undici

    ≥ 7.23.0, < 7.28.0 | ≥ 8.0.0, < 8.5.0

References (19)