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OpenAdvisories
Medium · 5.9 CVE-2026-120222 EUVD-2026-118179

undici vulnerable to Denial of Service via unhandled exception in cache-interceptor response replay

Published Nov 6, 2026 · Updated Nov 10, 2026 · Assigned by openjs

Description

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, when the cache interceptor is composed with a downstream handler that throws during response processing (such as the built-in dump interceptor exceeding its maxSize, or the decompress interceptor rejecting more than five Content-Encoding values), a throw raised asynchronously while a cached response is replayed escapes as an uncaught exception or unhandled promise rejection and terminates the Node.js process. A malicious or compromised HTTP server can crash any such client by serving a cacheable response that triggers the throw on replay, including on a 304 revalidation of a stale entry, so the impact is availability only. 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, avoid composing the cache interceptor with a response handler that throws during response processing until upgrading.

Affected products

VendorProductAffectedFixed
undici undici 7.0.0 – < 7.30.2, 8.0.0 – < 8.12.4 7.30.2

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 node-undici 8.12.4+dfsg+~cs3.2.5-1 —
Debian 13 node-undici No fix yet —
Debian 12 node-undici No fix yet —
ReleasePackageFixed inAdvisory
Ubuntu 26.10 node-undici No fix yet —
Ubuntu 26.04 LTS node-undici No fix yet —
Ubuntu 24.04 LTS node-undici No fix yet —

Azure Linux

ReleasePackageFixed inAdvisory
Azure Linux 3 nodejs 24.22.3-1 —

References