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Vulnerability record · CVE-2025-65570 · published 29 December 2025

CVE-2025-65570: Jsish type confusion vulnerability

Jsish · Jsish

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.

9.8 CVSS 3.1 Critical EPSS 0.53% · top 57.6% CWE-843 · Type confusion
9.8CVSS 3.1 base score
0.53%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://blog.mcsky.ro/writeups/2025/11/15/inline8-writeup.html ExploitThird Party Advisory
https://blog.mcsky.ro/writeups/2025/11/15/inline8-writeup.html ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-24186Jsish out-of-bounds write vulnerabilityJsish v3.5.0 (commit 42c694c) was discovered to contain a stack-overflow via the component IterGetKeysCallback at /jsish/src/jsiValue.c.EPSS 0.88%9.8CVE-2024-24188Jsish out-of-bounds write vulnerabilityJsish v3.5.0 was discovered to contain a heap-buffer-overflow in ./src/jsiUtils.c.EPSS 0.80%9.8CVE-2024-24189Jsish use after free vulnerabilityJsish v3.5.0 (commit 42c694c) was discovered to contain a use-after-free via the SplitChar at ./src/jsiUtils.c.EPSS 0.69%9.8CVE-2020-22873Jsish classic buffer overflow vulnerabilityBuffer overflow vulnerability in function NumberToPrecisionCmd in jsish before 3.0.7, allows remote attackers to execute arbitrary code.EPSS 2.3%9.8CVE-2020-22874Jsish integer overflow vulnerabilityInteger overflow vulnerability in function Jsi_ObjArraySizer in jsish before 3.0.8, allows remote attackers to execute arbitrary code.EPSS 3.3%9.8CVE-2020-22875Jsish integer overflow vulnerabilityInteger overflow vulnerability in function Jsi_ObjSetLength in jsish before 3.0.6, allows remote attackers to execute arbitrary code.EPSS 3.3%9.8CVE-2019-1010177Jsish use after free vulnerabilityJsish 2.4.70 2.047 is affected by: Use After Free. The impact is: denial of service and possibly arbitrary code execution. The component is: function…EPSS 2.1%7.8CVE-2021-46482Jsish out-of-bounds write vulnerabilityJsish v3.5.0 was discovered to contain a heap buffer overflow via NumberConstructor at src/jsiNumber.c.EPSS 0.84%

Source: NIST National Vulnerability Database (record CVE-2025-65570), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.