Is there a public exploit for CVE-2026-87008?

Yes. Proof-of-concept code for CVE-2026-87008 has been published publicly.

Is there a proof of concept for CVE-2026-87008?

Yes — 1 proof-of-concept entry is linked on this page, from public repositories and community submissions. They are listed for authorised testing only.

How severe is CVE-2026-87008?

CVE-2026-87008 scores CVSS 7.1 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.00264%.

What does CVE-2026-87008 affect?

CVE-2026-87008 affects code-graph-rag.

7.1 High

Code Graph RAG structural tools follow out-of-root symlinks

CVE-2026-87008

A remote/local attacker who can get a symbolic link included in a source-code repository that code-graph-rag analyzes can cause the structuralsearch and structuralreplace tools (backed by AstGrepService, exposed both as MCP tools and as agentic AI tools) to read and -- via structuralreplace with dryrun=False -- overwrite arbitrary files outside the configured project root, because the tool's path-containment check (shouldskippath/classifyfile) is performed lexically on the unresolved path and never checks Path.issymlink() or calls .resolve(), unlike the project's own (correct) validateprojectpath decorator used elsewhere. Tested at commit 90a3ed3cbdc7d3bb8036985b851cc7c9a3ba9c57 (pyproject version 0.0.550), current main at test time. Confirmed this commit already contains the fix for the prior advisory (GHSA-vvr2-h2jp-838m: paginated readfile path traversal) and the newer HTTP-MCP bearer-auth gate (validatehttpexposure in codebaserag/mcp/server.py) -- this is a distinct, still-open issue on top of those fixes, in a different component with a different root cause and a strictly worse impact (write, not just read). Details AstGrepService (codebaserag/tools/astgrepservice.py) backs…

Proof-of-concept code is published

Public PoC

Public PoCsqueeze440/code-graph-rag-PoC

Signals come from Exploit-DB, Metasploit, Nuclei and published proof-of-concept repositories. Their absence means nothing was found, not that nothing exists.

Assessment

CVSS: 7.1 (v3.1)
Severity: High
EPSS: 0.00264% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Public PoC
Published: 9 November 2026
Last updated: 9 November 2026
Affected: code-graph-rag
Weakness: CWE-22, CWE-59

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

At the source

GitHub Advisories

References

Community proofs of concept

No community proof of concept yet. If you have one for a published vulnerability and the right to share it, add it below — it will appear here once reviewed.

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