Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
undici's cache interceptor does not handle the Set-Cookie response header anywhere in its cache path, so it neither refuses to store nor strips that header. In shared cache mode, which is the default, an otherwise cacheable response that carries a Set-Cookie header, for example one marked with a public and max-age directive, is stored and then re-served to a later caller that matches the same cache key. As a result one caller's cookie is disclosed to a different caller, and an untrusted server can inject cookies into cached responses served to all subsequent callers. This violates the requirement that a shared cache must not store cookies. This affects undici versions from 7.0.0 up to 7.29.1 and from 8.0.0 up to 8.10.2. Users should upgrade to undici 7.29.1 or 8.10.2.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
🚨 Moderate-severity security fix in undici (7.29.1, 8.10.2) just released! Patches CVE-2026-84933: undici vulnerable to cross-user cookie disclosure via Set-Cookie caching in shared caches https://github.com/nodejs/undici/security/advisories/GHSA-2jfj-6hjv-fm6j
Post summary
A patch for undici versions 7.29.1 and 8.10.2 has been released to address the cross‑user cookie disclosure vulnerability identified as CVE-2026‑84933.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | nodejs | undici | - | node.js | - |