Is CVE-2026-112947 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-112947 being exploited in the wild.

How severe is CVE-2026-112947?

Medium severity, with a CVSS score of 4, published 20 October 2026.

Which products and versions are affected?

vite-plus (npm) >= 0.2.8, = 8.3.0, <= 8.3.2, SEMVER:introduced=8.3.0,fixed=8.3.3.

Is there a fix for CVE-2026-112947?

Yes. vite-plus (npm): upgrade to 1.1.0 or later; Vite: upgrade to 8.3.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-112947 attacked?

It is attacked over the network.

Am I affected by CVE-2026-112947?

Check whether you run vite-plus (npm), Vite or Vite at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-112947: Vite information disclosure via WebAssembly query parameter

Q: Is there a fix for CVE-2026-112947?

Yes. vite-plus (npm): upgrade to 1.1.0 or later; Vite: upgrade to 8.3.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-112947 attacked?

It is attacked over the network.

Q: Am I affected by CVE-2026-112947?

Check whether you run vite-plus (npm), Vite or Vite at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-112947 · Severity: medium · CVSS 4 · Published 2026-10-20

Vite is a frontend build tool for JavaScript applications. A flaw in its WebAssembly handling allows attackers to read the first 4 bytes of files outside the configured server directory by crafting specially formed requests. While the exposure is limited to just 4 bytes, this could reveal file signatures and headers that aid further attacks.

Technologies: vite-plus (npm), Vite, Vite. Vendors: npm, Vite.

Quick answers

Is CVE-2026-112947 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-112947 being exploited in the wild.
How severe is CVE-2026-112947?: Medium severity, with a CVSS score of 4, published 20 October 2026.
Which products and versions are affected?: vite-plus (npm) >= 0.2.8, <= 1.0.0, SEMVER:introduced=0.2.8,fixed=1.1.0; Vite 8.2.0 to 8.2.3, 8.3.0 to 8.3.2; Vite >= 8.3.0, <= 8.3.2, SEMVER:introduced=8.3.0,fixed=8.3.3.
Is there a fix for CVE-2026-112947?: Yes. vite-plus (npm): upgrade to 1.1.0 or later; Vite: upgrade to 8.3.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-112947 attacked?: It is attacked over the network.
Am I affected by CVE-2026-112947?: Check whether you run vite-plus (npm), Vite or Vite at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

vite-plus (npm): upgrade to 1.1.0 or later
```
npm install vite-plus@1.1.0
```
Vite: upgrade to 8.3.3 or later

Technical details

The Vite server's WebAssembly plugin load hook processes ?vite-wasm-instance query parameters without applying the fs.serve access controls. After reading the file from disk, failed WebAssembly parsing triggers an error message containing the first 4 bytes of the file. This affects versions 8.2.0–8.2.3 and 8.3.0–8.3.2, and is exploitable via network requests with no authentication required.

Affected products

Vite Vite 8.2.0 to 8.2.3, 8.3.0 to 8.3.2

Identifiers

CVE-2026-112947
GHSA-vfpm-58rq-9qcg

Timeline

2026-10-20: disclosed
2026-10-20: patched

References

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