GHSA-vp8m-p9jh-q5pm: undici (CVE-2026-85152)

Package	Ecosystem	Affected	Fixed in
undici	npm	>=8.10.0, <8.10.2	8.10.2

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The undici npm package, versions 8.10.0 up to but not including 8.10.2, builds cache and deduplication keys without the destination origin when interceptors.cache() or interceptors.deduplicate() is used with a shared store or instance across origins. An attacker who controls the response from one origin can have it returned for a matching request to a different, trusted origin, enabling cross-origin information disclosure and cache poisoning, such as JWKS poisoning. Upgrade to undici 8.10.2; until then, use a separate cache store and interceptor instance for each origin.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.4	High	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N	CNA (openjs)

CISA KEV Not listed.
EPSS 0.0016, the 5th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 13:34 UTC First seen by agentprime
31 Oct 2026, 13:34 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.