openjs undici up to 7.30.1/8.12.3 Redirect Interceptor information disclosure

Summaryinfo

A vulnerability was found in openjs undici up to 7.30.1/8.12.3 and classified as problematic. Affected by this issue is some unknown functionality of the component Redirect Interceptor. Executing a manipulation can lead to information disclosure. This vulnerability is handled as CVE-2026-120415. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in openjs undici up to 7.30.1/8.12.3 and classified as problematic. This vulnerability affects an unknown code of the component Redirect Interceptor. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

undici is an HTTP client for Node.js. In versions 7.0.0 through 7.30.1 and 8.0.0 through 8.12.3, the redirect interceptor strips sensitive headers such as Authorization, Cookie, Proxy-Authorization, and Host when a request is redirected to a different origin, but when request headers are supplied as an array of name and value tuples (a valid documented input, for example from Object.entries), the redirect handler misreads them as a flat list so the header names never match and the sensitive headers are not removed. If a header-normalizing interceptor such as cache or deduplicate is composed outside the redirect interceptor, it then serializes the retained headers onto the cross-origin request, disclosing the caller's origin-bound credentials to the unrelated redirect destination. This is a representation-dependent bypass of the cross-origin header stripping added in CVE-2024-30260. The issue is fixed in undici 7.30.2 and 8.12.4, and users should upgrade to one of those versions or later. As a workaround, supply request headers as a plain object or a flat name and value array rather than an array of tuples, or compose the redirect interceptor outside the normalizing interceptor.

The advisory is available at github.com. This vulnerability was named CVE-2026-120415 since 11/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 7.30.2 or 8.12.4 eliminates this vulnerability.

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Productinfo

Vendor

• openjs

Name

• undici

Version

• 7.30.0
• 7.30.1
• 8.12.0
• 8.12.1
• 8.12.2
• 8.12.3

CPE 2.3info

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CPE 2.2info

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