CVE-2026-92781Builder.io Gen2 SDKs through 5.2.11 Prototype Pollution via builder.userAttributes
Updated under an hour ago ()
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It affects BuilderIO @builder.io/sdk-react and 6 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
- Weakness (CWE)
- CWE-1321
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
BuilderIO @builder.io/sdk-react builderio:builder.io_sdk_react (from the name) | through 5.2.11 | CNA record |
BuilderIO @builder.io/sdk-vue builderio:builder.io_sdk_vue (from the name) | through 5.2.11 | CNA record |
BuilderIO @builder.io/sdk-svelte builderio:builder.io_sdk_svelte (from the name) | through 5.2.11 | CNA record |
BuilderIO @builder.io/sdk-solid builderio:builder.io_sdk_solid (from the name) | through 5.2.11 | CNA record |
BuilderIO @builder.io/sdk-qwik builderio:builder.io_sdk_qwik (from the name) | through 0.25.13 | CNA record |
BuilderIO @builder.io/sdk-angular builderio:builder.io_sdk_angular (from the name) | through 0.25.13 | CNA record |
BuilderIO @builder.io/sdk-react-nextjs builderio:builder.io_sdk_react_nextjs (from the name) | through 0.25.13 | CNA record |
References
- https://github.com/BuilderIO/builder/issues/4824issue-tracking
- https://github.com/BuilderIO/builderproduct
- https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/functions/get-content/generate-content-url.tstechnical-description
- https://github.com/BuilderIO/builder/blob/main/packages/sdks/src/helpers/flatten.ts#L60-L76technical-description
- https://www.vulncheck.com/advisories/builder-io-gen2-sdks-through-5.2.11-prototype-pollution-via-builder-userattributesthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.