CVE-2025-65570

CRITICAL

9.8

Description

A type confusion in jsish 2.0 allows incorrect control flow during execution of the OP_NEXT opcode. When an “instanceof” expression uses an array element access as the left-hand operand inside a for-in loop, the instructions implementation leaves an additional array reference on the stack rather than consuming it during OP_INSTANCEOF. As a result, OP_NEXT interprets the array as an iterator object and reads the iterCmd function pointer from an invalid structure, potentially causing a crash or enabling code execution depending on heap layout.

CVE Details

CVSS v3.1 Score9.8

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published12/29/2025

Last Modified12/31/2025

Sourcenvd

Honeypot Sightings0

Affected Products

jsish:jsish

Weaknesses (CWE)

CWE-843

References

https://blog.mcsky.ro/writeups/2025/11/15/inline8-writeup.html(cve@mitre.org)

https://blog.mcsky.ro/writeups/2025/11/15/inline8-writeup.html(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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