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CVE

CVE-2025-65570

A type confusion in jsish 2.0 allows incorrect control flow during execution of the OP_NEXT opcode.
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CVE

CVE-2025-65570

A type confusion in jsish 2.0 allows incorrect control flow during execution of the OP_NEXT opcode.

A type confusion in jsish 2.0 allows incorrect control flow during execution of the OPNEXT 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 OPINSTANCEOF. 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.

Package Versions Affected

Package Version
patch Availability
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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://blog.mcsky.ro/writeups/2025/11/15/inline8-writeup.html

Severity

9.8

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
9.8
EPSS Probability
0.00086%
EPSS Percentile
0.25327%
Introduced Version
0
Fix Available

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