VULNERABILITY INTELLIGENCE

CVE-2025-65570

CVSS score9.8 CRITICAL
EPSS probability0.53%
CISA KEVNot currently listed
Published2025-12-29
Last modified2026-10-13
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-843

Primary references