CVE-2025-65570 — CRITICAL (9.8)

Vulnerability 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.

CVSS Score

9.8

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Jsish	Jsish	2.0

Related Weaknesses (CWE)

CWE-843

References

https://blog.mcsky.ro/writeups/2025/11/15/inline8-writeup.htmlExploitThird Party Advisory
https://blog.mcsky.ro/writeups/2025/11/15/inline8-writeup.htmlExploitThird Party Advisory

FAQ

What is CVE-2025-65570?

CVE-2025-65570 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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-i...

How severe is CVE-2025-65570?

CVE-2025-65570 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2025-65570?

Check the references section above for vendor advisories and patch information. Affected products include: Jsish Jsish.