Prototype Pollution in Builderio @Builder.io/sdk-Angular
CVE-2026-92779
Builder.io Gen2 SDKs through versions 5.2.11 and 0.25.13 contain a prototype pollution vulnerability in the deep-set helper function that processes content block bindings without validation. Attackers can craft content blocks with binding keys containing __proto__, prototype, or constructor paths to pollute Object.prototype during rendering, affecting all subsequent objects created in the process including other tenants' renders.
Vulnerability class: Prototype Pollution
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L.
EPSS exploit prediction
EPSS: 0.005 (42.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/BuilderIO/builder/issues/4823 (issue-tracking)
- github.com/BuilderIO/builder (product)
- github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-processe… (technical-description)
- github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/set.ts (technical-description)
- www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-prototype-poll… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92779?
- CVE-2026-92779 is a high-severity vulnerability in Builderio @Builder.io/sdk-Angular, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.6/10. Published 2026-09-16.
- How severe is CVE-2026-92779?
- High severity. CVSS v3 base score is 7.6 out of 10.