CVE-2026-34217: SandboxJS is a JavaScript sandboxing library

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HIGH 7.2REMOTEUPGRADE

CVE-2026-34217 is a high-severity flaw (CVSS 7.2) affecting sandboxjs. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, a scope modification vulnerability exists in @nyariv/sandboxjs. The vulnerability allows untrusted sandboxed code to leak internal interpreter objects through the new operator, exposing sandbox scope objects in the scope hierarchy to untrusted code; an unexpected and undesired exploit. While this could allow modifying scopes inside the sandbox, code evaluation remains sandboxed and pr

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-668
Published	2026-04-06
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: nyariv

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-06 16:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

nyariv sandboxjs UPGRADE

Affected: < 0.8.36

Fixed in: 0.8.36

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls sandboxjs

2. UPGRADE to 0.8.36

npm install sandboxjs@">=0.8.36"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34217?

sandboxjs: upgrade to 0.8.36. Exact commands for each OS are on this page.

Is CVE-2026-34217 being exploited?

CVE-2026-34217 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34217 affect?

CVE-2026-34217 affects sandboxjs. Severity is high (CVSS 7.2). SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, a scope modification vulnerability exists in @nyariv/sandboxjs. The vulnerability allows untrusted sandboxed code to leak internal interpreter objects through the new operator,

How urgent is CVE-2026-34217?

Priority 41/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-34208 CRITICAL 10.0 UPGRADE SandboxJS is a JavaScript sandboxing library
CVE-2026-34211 HIGH 7.5 UPGRADE SandboxJS is a JavaScript sandboxing library

References

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