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  4. CVE 2026 120222 undici vulnerable to denial of service via
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Back to active CVEs
Medium · CVSS 5.9CVE-2026-120222

undici vulnerable to Denial of Service via unhandled exception in cache-interceptor response replayCVE-2026-120222

Answer in brief

CVE-2026-120222 records a Medium severity (CVSS 5.9) vulnerability in undici vulnerable to Denial of Service via unhandled exception in cache-interceptor response replay. The current sources do not mark it as known exploited. The current feed maps undici/undici (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 6, 2026Updated Nov 6, 2026Source checked Nov 6, 2026First seen by HOL Nov 6, 2026Material review Nov 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.9
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps undici/undici (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
undici/undicigeneric>=7.0.0 <7.30.2 || >=8.0.0 <8.12.47.30.2, 8.12.4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for undici/undici.
  2. 2Review the reported fix. Update undici/undici to 7.30.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 6, 2026

Sources and claim methodology

  • Source referencecna.openjsf.org
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • undici vulnerable to cache poisoning and cross-user disclosure via intermediate redirect hopsSame undici/undici package
  • undici vulnerable to cross-user information disclosure via cross-origin redirect revalidationSame undici/undici package
  • undici vulnerable to cross-origin credential disclosure via array-of-tuples headers bypassing redirect strippingSame undici/undici package
  • undici vulnerable to Subresource Integrity bypass via whitespace in integrity metadataSame undici/undici package
  • undici vulnerable to cross-user cache disclosure via same-origin redirectSame undici/undici package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-248, CWE-755
Source
CVE List V5
Source checked
Nov 6, 2026
References
2 linked sources
Open source record