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CVE-2025-65570

9.8 critical SSVC exploitation: poc Analyzed
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 1

  1. First seenCVSS 9.8 · jsishNVD modified 2026-10-13 09:10

Affected (CPE criteria) 1

  • cpe:2.3:a:jsish:jsish:2.0:*:*:*:*:*:*:*

References 2