# CVE-2026-87008: Code Graph RAG structural tools follow out-of-root symlinks

Status: published. Published: 2026-11-05. Updated: 2026-11-05.

Code Graph RAG is an AI-powered knowledge graph and retrieval system for querying, understanding, and editing multi-language codebases. Prior to 0.0.589, AstGrepService in codebase_rag/tools/ast_grep_service.py enumerates files beneath project_root and relies on should_skip_path in codebase_rag/utils/path_utils.py to classify them, but the containment check operates on unresolved lexical paths. A symbolic link planted inside an analyzed repository can therefore reference a file outside the configured root while still appearing in scope. The structural_search tool follows the link and discloses readable content without an approval gate, while structural_replace with dry_run=False follows it and overwrites writable content; the MCP path invokes structural replacement without the agent-loop approval control. An attacker who causes a victim to analyze a repository containing such a link can read credentials, keys, environment files, or sibling source and can modify files accessible to the code-graph-rag process. This issue is fixed in version 0.0.589.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- vitali87 / code-graph-rag: < 0.0.589 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 7.1 (high); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation poc; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-22, CWE-59

## Exploit evidence

- exploit: https://github.com/vitali87/code-graph-rag/security/advisories/GHSA-85gg-2gfq-q95m (ADP: CISA-ADP)

## References

- https://github.com/vitali87/code-graph-rag/security/advisories/GHSA-85gg-2gfq-q95m (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/vitali87/code-graph-rag/commit/2648c95aa550ce2d9361a8e75ed669d5f4b451b8 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/vitali87/code-graph-rag/releases/tag/v0.0.589 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/vitali87/code-graph-rag/security/advisories/GHSA-85gg-2gfq-q95m (ADP: CISA-ADP; exploit)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-87008; retrieved 2026-11-05; source updated 2026-11-05

Revision: 3d5851edab8be050ef8b05bfc24d0c2f632c890f58a5cdace7e103bf55f895ed

Canonical: https://y2.dev/cve/CVE-2026-87008

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.