CVE-2026-25142Public exploitNetwork attack vector

Host code execution via function-property prototype bypass

Published Feb 2, 2026 · Updated Feb 2, 2026

Code injection in nyariv SandboxJS before 0.8.27 allows remote attackers to escape the JavaScript sandbox and execute host code. The function-property access branch in executor.ts skips prototype-chain whitelist checks, exposing Object.prototype.lookupGetter to sandboxed code. Untrusted JavaScript execution is required; the exposed getter recovers host prototypes and the Function constructor, enabling arbitrary host commands.

CVSS severity10.0
Critical
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in nyariv SandboxJS before 0.8.27 allows remote attackers to escape the JavaScript sandbox and execute host code. The function-property access branch in executor.ts skips prototype-chain whitelist checks, exposing Object.prototype.lookupGetter to sandboxed code. Untrusted JavaScript execution is required; the exposed getter recovers host prototypes and the Function constructor, enabling arbitrary host commands.

The record

CVE
CVE-2026-25142
Published
Feb 2, 2026
Updated
Feb 2, 2026
Vendor
nyariv
Product
SandboxJS
Classifications
CWE-1321, CWE-94, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.8.27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

nyariv · SandboxJSversion=< 0.8.27

Published CVSS scores

10.0GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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