CVE-2025-65570Public exploitNetwork attack vector

Code execution via iterator object type confusion

Published Dec 29, 2025 · Updated Dec 29, 2025

Type confusion in jsish 2.0 allows remote attackers to execute code by supplying crafted JavaScript to the interpreter. OP_INSTANCEOF leaves an array reference on the operand stack when an array element is its left operand, so OP_NEXT treats that array as an iterator and calls an invalid iterCmd function pointer. Exploitation requires the crafted expression inside a for-in loop; a controlled heap layout redirects execution to a system command, while an uncontrolled layout crashes the interpreter.

CVSS severity9.8
Critical
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in jsish 2.0 allows remote attackers to execute code by supplying crafted JavaScript to the interpreter. OP_INSTANCEOF leaves an array reference on the operand stack when an array element is its left operand, so OP_NEXT treats that array as an iterator and calls an invalid iterCmd function pointer. Exploitation requires the crafted expression inside a for-in loop; a controlled heap layout redirects execution to a system command, while an uncontrolled layout crashes the interpreter.

The record

CVE
CVE-2025-65570
Published
Dec 29, 2025
Updated
Dec 29, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-843, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 29, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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.

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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-843Access of Resource Using Incompatible Type ('Type Confusion')
T1203Exploitation for Client Execution

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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