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.
References
blog.mcsky.ro/writeups/2025/11/15/inline8-writeup.html
blog.mcsky.ro/writeups/2025/11/15/inline8-writeup.html
Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.
