Improper Certificate Validation Affecting undici package, versions >=7.23.0 <7.28.0>=8.0.0 <8.5.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-UNDICI-17372609
- published18 Jun 2026
- disclosed17 Jun 2026
- credittonghuaroot (童话)
Introduced: 17 Jun 2026
CVE-2026-9697 (opens in a new tab)How to fix?
Upgrade undici to version 7.28.0, 8.5.0 or higher.
Overview
undici is an An HTTP/1.1 client, written from scratch for Node.js
Affected versions of this package are vulnerable to Improper Certificate Validation in the ProxyAgent when configured with a SOCKS5 proxy URI, which causes the requestTls option to be silently dropped. An attacker can intercept and tamper with HTTPS traffic by exploiting the fallback to the default trust store, thereby bypassing user-configured TLS restrictions.
Note: This is only exploitable if the application uses a SOCKS5 proxy and relies on requestTls for TLS scope restriction.
Workaround
This vulnerability can be mitigated by routing traffic through an HTTP-proxy ProxyAgent instead of SOCKS5, where requestTls is honored correctly.