fix: add buffer-length check in unzip.cpp

[anupamme]

Summary

Fix critical severity security issue in TKLiveSync/unzip.cpp.

Vulnerability

Field	Value
ID	V-001
Severity	CRITICAL
Scanner	multi_agent_ai
Rule	V-001
File	TKLiveSync/unzip.cpp:49
Assessment	Likely exploitable
CWE	CWE-120

Description: A PATH_MAX-sized heap buffer (pathcopy) receives ZIP entry names via strcpy() without bounds checking. ZIP specification allows entry names up to 65535 bytes, far exceeding typical PATH_MAX values (4096 or 1024). This creates a classic buffer overflow where crafted long filenames overflow the heap buffer.

Evidence

Exploitation scenario: Attacker creates a ZIP archive with an entry name longer than PATH_MAX bytes.

Scanner confirmation: multi_agent_ai rule V-001 flagged this pattern.

Production code: This file is in the production codebase, not test-only code.

Threat Model Context

This is a Node.js library - vulnerabilities affect downstream consumers who use this package.

Changes

• TKLiveSync/unzip.cpp

Behavior Preservation

The change is scoped to 1 file on the vulnerable path; it only tightens handling of untrusted input and leaves valid inputs unaffected.

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Automated security fix by OrbisAI Security

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[NathanWalker]

Thank you, target main branch instead of dev on this PR.

[anupamme]

Thank you, target main branch instead of dev on this PR.

done.