# CVE-2026-120415: undici cross-origin credential disclosure via array-of-tuples headers

Source: https://junglewise.ai/threats/cve-2026-120415-undici-is-an-http-client-for-node-js-in-versions-7-0-0-through-7  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-06. Updated: 2026-11-06  
License: CC BY 4.0 with a link back

CVE-2026-120415 · Severity: medium · CVSS 5.9 · Published 2026-11-06

undici is an HTTP client library for Node.js that handles web requests and redirects. A vulnerability in versions 7.0.0 through 7.30.1 and 8.0.0 through 8.12.3 allows sensitive credentials like authentication tokens and cookies to leak to unrelated websites when a redirect occurs, if request headers are formatted in a specific way. An attacker controlling a redirect destination could capture credentials intended only for the original server.

Vendors: [Nodejs](https://junglewise.ai/threats/vendors/nodejs).

## Quick answers

**Is CVE-2026-120415 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-120415 being exploited in the wild.

**How severe is CVE-2026-120415?** Medium severity, with a CVSS score of 5.9, published 6 November 2026.

**Which products and versions are affected?** Nodejs Undici 7.0.0 through 7.30.1, 8.0.0 through 8.12.3.

**Is there a fix for CVE-2026-120415?** Yes: fixed in undici 7.30.2, 8.12.4. Until then: Supply request headers as a plain object or flat [name, value, name, value] array rather than an array of [name, value] tuples, or compose the redirect() interceptor outside normalizing interceptors (cache() or deduplicate()). Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-120415 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-120415?** Check whether you run Nodejs Undici at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in undici 7.30.2, 8.12.4

Supply request headers as a plain object or flat [name, value, name, value] array rather than an array of [name, value] tuples, or compose the redirect() interceptor outside normalizing interceptors (cache() or deduplicate()).

## Technical details

The redirect interceptor fails to strip sensitive headers (Authorization, Cookie, Proxy-Authorization, Host) when headers are supplied as an array of [name, value] tuples instead of a flat array or object. The interceptor misinterprets tuple format as a flat list, causing header name comparisons to fail and sensitive headers to be retained. When a normalizing interceptor (cache or deduplicate) composes outside the redirect interceptor, it serializes these retained headers onto cross-origin requests, disclosing origin-bound credentials.

## Affected products

- nodejs undici 7.0.0 through 7.30.1, 8.0.0 through 8.12.3

## Timeline

- 2026-11-06: disclosed

## References

- [https://cna.openjsf.org/security-advisories.html](https://cna.openjsf.org/security-advisories.html)
- [https://github.com/nodejs/undici/security/advisories/GHSA-9v6h-8rgp-m69f](https://github.com/nodejs/undici/security/advisories/GHSA-9v6h-8rgp-m69f)

## Related threats

- [undici WebSocket client denial of service via failed HTTP/2 handshake](https://junglewise.ai/threats/cve-2026-109855-undici-is-an-http-client-library-for-node-js-in-versions-8-11-0)