CVE-2026-23830Public exploitNetwork attack vectorHinoki check available

Host code execution via exposed AsyncFunction constructor

Published Jan 27, 2026 · Updated Jan 27, 2026

Code injection in nyariv SandboxJS before 0.8.26 allows attackers to execute arbitrary host JavaScript through sandboxed async functions. The executor returns the native AsyncFunction constructor because the safe-replacement map omits it, so constructed functions run in the host global scope. Exploitation requires an application to pass attacker-controlled code into SandboxJS; a successful escape grants that code the host process's privileges.

CVSS severity10.0
Critical
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Code injection in nyariv SandboxJS before 0.8.26 allows attackers to execute arbitrary host JavaScript through sandboxed async functions. The executor returns the native AsyncFunction constructor because the safe-replacement map omits it, so constructed functions run in the host global scope. Exploitation requires an application to pass attacker-controlled code into SandboxJS; a successful escape grants that code the host process's privileges.

The record

CVE
CVE-2026-23830
Published
Jan 27, 2026
Updated
Jan 27, 2026
Vendor
nyariv
Product
SandboxJS
Classifications
CWE-913, CWE-94, CWE-693, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 0.8.26

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

nyariv · SandboxJSversion=< 0.8.26

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-913Improper Control of Dynamically-Managed Code Resources
CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-693Protection Mechanism Failure
T1059.007JavaScript/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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