CVE-2026-85152 undici vulnerable to cross-origin cache poisoning via missing origin isolation in interceptors
Attackers can poison the cache to serve responses from one origin to another, causing information disclosure and authentication bypass in undici.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-85152?
CVE-2026-85152 is a high-severity vulnerability in Nodejs Undici, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-346
Which versions are affected by CVE-2026-85152?
2 open source packages ship an affected version, including undici. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
undici npm | From 8.10.0 | 8.10.2 |
undici npm | From 8.10.0 | 8.10.2 |
Products include Nodejs Undici.
How do I fix CVE-2026-85152?
Upgrade undici to 8.10.2 or later.
Is CVE-2026-85152 being exploited?
There is no known exploitation of CVE-2026-85152 in the wild and no public exploit code.
Other vulnerabilities in Nodejs Undici
- CVE-2026-109855 undici WebSocket client vulnerable to Denial of Service via failed HTTP/2 handshake
- CVE-2026-109869 undici vulnerable to Denial of Service via unhandled error on excessive content-encodings
- CVE-2026-87018 undici vulnerable to Denial of Service via TLS 1.2 certificate-changing renegotiation
- CVE-2026-19534 undici vulnerable to Denial of Service via unrequested WebSocket subprotocol
- CVE-2026-12151 undici WebSocket client vulnerable to denial of service via fragment count bypass
Sources
Also known as DEBIAN-CVE-2026-85152, ECHO-60b6-e448-56a4, GHSA-vp8m-p9jh-q5pm, MINI-3c4r-7wv4-wqvg, MINI-76rm-qph7-r2v6, MINI-prjv-h5fh-8xjq and 4 more.