What’s Vulnerable › Vulnerabilities

CVE-2025-65570

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-29 · updated 2026-10-13
• Weakness: CWE-843

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.

Affected products

• Jsish Jsi: 2.0

References

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

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