Is there a public exploit for CVE-2026-77604?

No public exploit for CVE-2026-77604 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-77604?

CVE-2026-77604 scores CVSS 7.5 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.38%.

What does CVE-2026-77604 affect?

CVE-2026-77604 affects vitali87 code-graph-rag.

7.5 High

Code Graph RAG: MCP paginated read_file path traversal / arbitrary file read

CVE-2026-77604

Summary The readfile MCP tool in codebaserag/mcp/tools.py contains a path traversal vulnerability in its paginated branch (when offset or limit is supplied). The handler constructs a file path using Path(self.projectroot) / filepath without subsequently validating that the resolved path remains within the configured project root. Python's pathlib silently discards the left-hand component when the right-hand argument is an absolute path, allowing an attacker to read any UTF-8-readable file on the server by passing an absolute path such as /etc/passwd. Details Vulnerable location: codebaserag/mcp/tools.py:556–565 (MCPToolsRegistry.readfile) The readfile MCP tool accepts three parameters: filepath, offset, and limit. When either offset or limit is present the handler takes a distinct code path: python codebaserag/mcp/tools.py:556-565 async def readfile( self, filepath: str, offset: int | None = None, limit: int | None = None ) -> str: logger.info(lg.MCPREADFILE.format(path=filepath, offset=offset, limit=limit)) try: if offset is not None or limit is not None: fullpath = Path(self.projectroot) / filepath # ← VULNERABLE LINE start = offset if offset is not None else 0 with…

Assessment

CVSS: 7.5 (v3.1)
Severity: High
EPSS: 0.38% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 9 November 2026
Last updated: 9 November 2026
Affected: vitali87 · code-graph-rag · code-graph-rag
Weakness: CWE-22
Assigner: GitHub_M

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

At the source

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