OpenJS Foundation Undici up to 8.10.1 Cache cross-domain policy

Summaryinfo

A vulnerability categorized as problematic has been discovered in OpenJS Foundation Undici up to 8.10.1. This impacts an unknown function of the component Cache. The manipulation results in cross-domain policy. This vulnerability was named CVE-2026-85152. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in OpenJS Foundation Undici up to 8.10.1. Affected is an unknown functionality of the component Cache. The manipulation with an unknown input leads to a cross-domain policy vulnerability. CWE is classifying the issue as CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. This is going to have an impact on confidentiality. CVE summarizes:

undici 8.10.0 omits the destination origin from the cache and request-deduplication keys when the cache or deduplicate interceptor is composed directly onto a Client or Pool. Because the internal cache key falls back to an empty origin string, a cacheable or in-flight response from one upstream origin is returned for a request to a different, trusted origin whenever the method, path, and relevant headers match, which permits cross-origin information disclosure and persistent cache poisoning. The reporter demonstrated a full authentication bypass in which a JWT signed with an attacker-controlled key was accepted as belonging to a trusted issuer, and the trusted origin was never contacted. This is a regression introduced in 8.10.0 and affects undici versions from 8.10.0 up to 8.10.2. Applications using an Agent, which carries the origin in its dispatch options, are not affected. Users should upgrade to undici 8.10.2.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-85152 since 09/03/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available.

Upgrading to version 8.10.2 eliminates this vulnerability.

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Productinfo

Vendor

• OpenJS Foundation

Name

• Undici

Version

• 8.10.0
• 8.10.1

CPE 2.3info

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CPE 2.2info

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