CVE-2026-9697

A flaw was found in undici. When undici's ProxyAgent is configured with a SOCKS5 proxy Uniform Resource Identifier (URI), it silently ignores Transport Layer Security (TLS) options, such as custom Certificate Authorities (CAs). This allows a remote attacker to perform a Man-in-the-Middle (MITM) attack, intercepting and tampering with HTTPS communications. The connection falls back to Node.js's default trust store, bypassing intended security configurations and potentially leading to information disclosure or arbitrary code execution.

This is an Important vulnerability. Applications using undici's ProxyAgent with a SOCKS5 proxy URI will silently ignore user-configured TLS options, including custom Certificate Authorities. This bypasses intended security controls for HTTPS communication, enabling a remote attacker to perform Man-in-the-Middle attacks, potentially leading to information disclosure or arbitrary code execution in affected Red Hat products.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.