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Vulnerabilities

Vulnerability · CVE-2025-34146

A prototype pollution vulnerability exists in @nyariv/sandboxjs versions <= 0.8.23, allowing attackers to inject arbitrary properties into Object.prototype via crafted JavaScript c

Published Jul 31, 2025 · catalog updated Oct 8, 2026 · A prototype pollution vulnerability

Last checked Oct 24, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-34146. EPSS is 0.23%. Act only if a listed version of A prototype pollution vulnerability is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A prototype pollution vulnerability).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.23%
Remediation
Vendor / distro source
Affected products
vendor nyariv sandboxjs 0 ≤0.8.23

A prototype pollution vulnerability exists in @nyariv/sandboxjs versions <= 0.8.23, allowing attackers to inject arbitrary properties into Object.prototype via crafted JavaScript code. This can result in a denial-of-service (DoS) condition or, under certain conditions, escape the sandboxed environment intended to restrict code execution. The vulnerability stems from insufficient prototype access checks in the sandbox’s executor logic, particularly in the handling of JavaScript function objects returned.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor nyariv sandboxjs 0 ≤0.8.230 ≤0.8.23

How to fix CVE-2025-34146

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-34146. EPSS is 0.23%. Act only if a listed version of A prototype pollution vulnerability is installed.

Which versions are affected?

Compare what you have installed with nyariv sandboxjs 0 ≤0.8.23 0 ≤0.8.23. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.23%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 31, 2025 · EUVD

    Detected

    A prototype pollution vulnerability exists in @nyariv/sandboxjs versions <= 0.8.23, allowing attackers to inject arbitrary properties into Object.prototype via crafted JavaScript code. This can result in a denial-of-service (DoS) condition or, under certain conditions, escape the sandboxed environment intended to restrict code execution. The vulnerability stems from insufficient prototype access c

  2. Oct 8, 2026 · EUVD

    Updated

    A prototype pollution vulnerability exists in @nyariv/sandboxjs versions <= 0.8.23, allowing attackers to inject arbitrary properties into Object.prototype via crafted JavaScript code. This can result in a denial-of-service (DoS) condition or, under certain conditions, escape the sandboxed environment intended to restrict code execution. The vulnerability stems from insufficient prototype access c

Sources

  • CVE.orgVulnerability recordCVE-2025-34146

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-34146

    30-day exploitation probability 0.23%

    first.org
  • EUVDVulnerability recordEUVD-2025-23278

    A prototype pollution vulnerability exists in @nyariv/sandboxjs versions <= 0.8.23, allowing attackers to inject arbitrary properties into Object.prototype via crafted JavaScript code. This can result in a denial-of-service (DoS) condition or, under certain conditions, escape the

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 24, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 24, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 20, 2026