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Back to active CVEs
Medium · CVSS 5.3CVE-2026-92781

Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributesCVE-2026-92781

Answer in brief

CVE-2026-92781 records a Medium severity (CVSS 5.3) vulnerability in Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes. The current sources do not mark it as known exploited. The current feed maps BuilderIO/@builder.io/sdk-angular (generic), BuilderIO/@builder.io/sdk-angular (generic), BuilderIO/@builder.io/sdk-qwik (generic), BuilderIO/@builder.io/sdk-qwik (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Sep 16, 2026Updated Sep 24, 2026Source checked Nov 1, 2026First seen by HOL Sep 16, 2026Material review Sep 24, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.3
Exploitation
Not marked as known exploited
Affected software
14 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.3. 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 BuilderIO/@builder.io/sdk-angular (generic), BuilderIO/@builder.io/sdk-angular (generic), BuilderIO/@builder.io/sdk-qwik (generic), BuilderIO/@builder.io/sdk-qwik (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
BuilderIO/@builder.io/sdk-angulargeneric0Not reported
BuilderIO/@builder.io/sdk-angulargeneric>=0 <=0.25.13Not reported
BuilderIO/@builder.io/sdk-qwikgeneric0Not reported
BuilderIO/@builder.io/sdk-qwikgeneric>=0 <=0.25.13Not reported
BuilderIO/@builder.io/sdk-reactgeneric0Not reported
BuilderIO/@builder.io/sdk-reactgeneric>=0 <=5.2.11Not reported
BuilderIO/@builder.io/sdk-react-nextjsgeneric0Not reported
BuilderIO/@builder.io/sdk-react-nextjsgeneric>=0 <=0.25.13Not reported
BuilderIO/@builder.io/sdk-solidgeneric0Not reported
BuilderIO/@builder.io/sdk-solidgeneric>=0 <=5.2.11Not reported
BuilderIO/@builder.io/sdk-sveltegeneric0Not reported
BuilderIO/@builder.io/sdk-sveltegeneric>=0 <=5.2.11Not reported
BuilderIO/@builder.io/sdk-vuegeneric0Not reported
BuilderIO/@builder.io/sdk-vuegeneric>=0 <=5.2.11Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for BuilderIO/@builder.io/sdk-angular, BuilderIO/@builder.io/sdk-angular, BuilderIO/@builder.io/sdk-qwik.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Sep 16, 2026

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

  2. Source modified

    Sep 24, 2026

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

  3. First seen by HOL

    Sep 16, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

Builder.io Gen2 SDKs through versions 5.2.11 and 0.25.13 contain a prototype pollution vulnerability in the unflatten helper that processes builder.userAttributes query parameters without prototype guards. Attackers can craft preview links with __proto__ or prototype segments to pollute Object.prototype in a visitor's browser when the SDK processes the malicious URL.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-1321
Source
CVE List V5
Source checked
Nov 1, 2026
References
5 linked sources
Open source record