TI-2025-40399 Aliases CVE-2025-65570 GHSA-r6xg-3mr4-3226

A type confusion in jsish 2.0 allows incorrect control flow during execution of the…

HIGH 82CWE-843Published 2025-12-29 · Updated 2025-12-31

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-843 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00528 44th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:jsish:jsish:2.0:::::::*	2.0	Vulnerable	Jsish

cpe:2.3:a:jsish:jsish:2.0:*:*:*:*:*:*:* Versions 2.0 Vulnerable ·Jsish

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-65570
2026-10-03 Alias added: GHSA-r6xg-3mr4-3226

References

Exploit 1

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

TI-2024-16031 Jsish v3.5.0 (commit 42c694c) was discovered to contain a stack-overflow via the… CVSS 3.1CRITICAL 9.8
TI-2024-16033 Jsish v3.5.0 (commit 42c694c) was discovered to contain a use-after-free via the SplitChar at ./src/jsiUtils.c. CVSS 3.1CRITICAL 9.8
TI-2020-14504 An issue found in Jsish v.3.0.11 and before allows an attacker to cause a denial of… CVSS 3.1HIGH 7.5
TI-2024-16032 Jsish v3.5.0 was discovered to contain a heap-buffer-overflow in ./src/jsiUtils.c. CVSS 3.1CRITICAL 9.8
TI-2020-14415 Integer overflow vulnerability in function Jsi_ObjSetLength in jsish before 3.0.6, allows… CVSS 3.1CRITICAL 9.8
TI-2020-14414 Integer overflow vulnerability in function Jsi_ObjArraySizer in jsish before 3.0.8… CVSS 3.1CRITICAL 9.8

See all 52 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences