🛡️ CVE-2025-65570
🔴 CVSS 9.8 — Critical ⚠️ Exploit Public CWE-843 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity CRITICAL
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-843
Public Exploit ⚠️ Yes
Source NVD
Published 2025-12-29
Updated 2026-06-02
Modified 2025-12-31
Fix URL N/A

Affected Packages

Software From version Fixed in
jsish — —

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