Allocation of Resources Without Limits or Throttling Affecting @a2ui/web_core package, versions <0.12.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published28 Oct 2026
- disclosed28 Oct 2026
- creditez-lbz
Introduced: 28 Oct 2026
NewCVE-2026-118273 (opens in a new tab)How to fix?
Upgrade @a2ui/web_core to version 0.12.0 or higher.
Overview
@a2ui/web_core is an A2UI Core Library
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via DataModel.set() in data-model.ts when a caller sets data at a large array index (e.g., /items/10000000). The target array expands without an upper bound, and when ancestor signals are notified, updateSignal spreads the array with [...val], iterating over millions of empty sparse slots. This freezes the main thread and causes an Out-Of-Memory crash.