HOMEVULNERABILITIESCVE-2026-34211
HIGH

CVE-2026-34211

CWE-674Published: April 6, 2026· Updated: Apr 9, 2026

7.5
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:12.8th

Official Description

SandboxJS is a JavaScript sandboxing library. Prior to 0.8.36, the @nyariv/sandboxjs parser contains unbounded recursion in the restOfExp function and the lispify/lispifyExpr call chain. An attacker can crash any Node.js process that parses untrusted input by supplying deeply nested expressions (e.g., ~2000 nested parentheses), causing a RangeError: Maximum call stack size exceeded that terminates the process. This vulnerability is fixed in 0.8.36.

NVD Source

Technical Analysis

CVE-2026-34211 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

nyariv1 product
sandboxjs
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://github.com/nyariv/SandboxJS/security/advisories/GHSA-8pfc-jjgw-6g26

All References (1)

→
https://github.com/nyariv/SandboxJS/security/advisories/GHSA-8pfc-jjgw-6g26Exploit · Mitigation · Vendor Advisory

Quick Facts

CVE IDCVE-2026-34211
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-674
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedApr 6, 2026

Related CVEs (CWE-674)

CVE-2026-25971
9.8
CVE-2026-40324
9.1
CVE-2026-41673
8.7
CVE-2026-25048
8.7
CVE-2026-8936
8.2
CVE-2026-40879
7.5

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-34211 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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