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  4. CVE 2026 120423 undici vulnerable to subresource integrity bypass
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Back to active CVEs
Medium · CVSS 5.9CVE-2026-120423

undici vulnerable to Subresource Integrity bypass via whitespace in integrity metadataCVE-2026-120423

Answer in brief

CVE-2026-120423 records a Medium severity (CVSS 5.9) vulnerability in undici vulnerable to Subresource Integrity bypass via whitespace in integrity metadata. 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>=7.15.0 <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 7.15.0 through 7.30.1 and 8.0.0 through 8.12.3, fetch verifies Subresource Integrity metadata by splitting the integrity string on a single space, but the SRI grammar separates metadata by ASCII whitespace, which also includes the horizontal tab. An integrity value whose digest is preceded by a tab or other ASCII whitespace is parsed as a single unrecognized token and skipped, and when no recognized algorithm remains undici treats the integrity list as empty and accepts the response, so a server returning a body different from the pinned digest passes the check. An application that pins a response with a valid but whitespace-surrounded SRI value receives attacker-controlled bytes with no integrity error, and the attacker needs only to control the response body, not the integrity metadata. 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, supply SRI integrity metadata without surrounding whitespace, using a single space to separate multiple digests.

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 Denial of Service via unhandled exception in cache-interceptor response replaySame undici/undici package
  • undici vulnerable to cross-origin credential disclosure via array-of-tuples headers bypassing redirect strippingSame undici/undici package
  • undici vulnerable to cross-user cache disclosure via same-origin redirectSame undici/undici package

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
CWE-354
Source
CVE List V5
Source checked
Nov 6, 2026
References
2 linked sources
Open source record