Improper Certificate Validation in undici - CVE-2026-9697

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Main Vulnerability Database Vulnerabilities #VU134754

Improper Certificate Validation in undici - CVE-2026-9697

Published: June 17, 2026


Vulnerability identifier: #VU134754
CSH Severity: Medium
CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-9697
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to intercept and modify HTTPS traffic.

The vulnerability exists due to improper certificate validation in ProxyAgent and Socks5ProxyAgent when establishing HTTPS connections through a SOCKS5 proxy. A remote attacker can present a certificate signed by a publicly trusted CA for the target hostname to intercept and modify HTTPS traffic.

Only applications that rely on requestTls settings for TLS scope restriction when using a SOCKS5 proxy are affected.


Affected software

undici
Netezza Appliance
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Fedora
Red Hat OpenShift Container Platform
nodejs24

How to mitigate CVE-2026-9697

Install security update from vendor's website.

undici - addressed in versions 7.28.0, 8.5.0
Netezza Appliance - update to 1.0.2.0
Red Hat OpenShift Container Platform - update to 4.16.66
nodejs24 - update to 24.18.0-1.fc44

External References

Related Security Bulletins