CVE-2026-92781
5.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| BuilderIO | @builder.io/sdk-react | 0 <= 5.2.11 | affected |
| BuilderIO | @builder.io/sdk-vue | 0 <= 5.2.11 | affected |
| BuilderIO | @builder.io/sdk-svelte | 0 <= 5.2.11 | affected |
| BuilderIO | @builder.io/sdk-solid | 0 <= 5.2.11 | affected |
| BuilderIO | @builder.io/sdk-qwik | 0 <= 0.25.13 | affected |
| BuilderIO | @builder.io/sdk-angular | 0 <= 0.25.13 | affected |
| BuilderIO | @builder.io/sdk-react-nextjs | 0 <= 0.25.13 | affected |
Weaknesses
- CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
References
- https://github.com/BuilderIO/builder/issues/4824
- https://github.com/BuilderIO/builder
- https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-content/generate-content-url.ts
- https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/helpers/flatten.ts#L60-L76
- https://www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-prototype-pollution-via-builder-userattributes
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