Medium severity6.3NVD Advisory· Published Sep 16, 2026
CVE-2026-92781
CVE-2026-92781
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.
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Affected products
2Patches
Vulnerability mechanics
References
4- github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-content/generate-content-url.tsnvd
- github.com/BuilderIO/builder/blob/main/packages/sdks/src/helpers/flatten.tsnvd
- github.com/BuilderIO/builder/issues/4824nvd
- www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-prototype-pollution-via-builder-userattributesnvd
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