CyberSecBulletin
CVE-2026-92779NVD status: Deferred

@builder.io/sdk-react: Improperly Controlled Modification of Object Prototype Attributes

Published Updated By the CyberSecBulletin desk

CVE-2026-92779 is a high-severity improperly controlled modification of object prototype attributes vulnerability in @builder.io/sdk-react from BuilderIO, with a CVSS 3.1 base score of 7.6 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected @builder.io/sdk-react versions: 5.2.11 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.49% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Check which version of @builder.io/sdk-react you run against the affected versions below, and install the vendor's latest release.

Affected products and versions

VendorProductAffected versionsFixed in
BuilderIO@builder.io/sdk-react5.2.11 and earlierNot stated
BuilderIO@builder.io/sdk-vue5.2.11 and earlierNot stated
BuilderIO@builder.io/sdk-svelte5.2.11 and earlierNot stated
BuilderIO@builder.io/sdk-solid5.2.11 and earlierNot stated
BuilderIO@builder.io/sdk-qwik0.25.13 and earlierNot stated
BuilderIO@builder.io/sdk-angular0.25.13 and earlierNot stated
BuilderIO@builder.io/sdk-react-nextjs0.25.13 and earlierNot stated

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
LowSome restricted data can be read.
Integrity
HighData or code can be modified at will.
Availability
LowPerformance or availability is reduced.

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L. Scored by CNA (vulncheck.com).

Scoring systemScoreSeverityScored by
CVSS 4.07.2HighCNA (vulncheck.com)
CVSS 3.17.6HighCNA (vulncheck.com)

Official description

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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improperly Controlled Modification of Object Prototype Attributes

The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype.

How developers prevent this class of flaw

  • By freezing the object prototype first (for example, Object.freeze(Object.prototype)), modification of the prototype becomes impossible.
  • By blocking modifications of attributes that resolve to object prototype, such as proto or prototype, this weakness can be mitigated.
  • When handling untrusted objects, validating using a schema can be used.

More Improperly Controlled Modification of Object Prototype Attributes vulnerabilities (CWE-1321)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Improperly Controlled Modification of Object Prototype Attributes vulnerabilities

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