# CVE-2026-117558: ai-sdlc MCP Server through 0.31.2 Command Injection via check_issue and check_pr_status

Status: published. Published: 2026-10-27. Updated: 2026-11-02.

The ai-sdlc plugin MCP server through 0.31.2 contains an OS command injection vulnerability that allows attackers to execute commands by supplying shell metacharacters in the repo argument. The unvalidated repo value is interpolated into gh issue view or gh pr view commands run via execSync(), letting prompt-injected agents execute commands as the MCP server user.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/ai-sdlc-framework/ai-sdlc/commit/717d7ecf068b714f65955e50fcf5cb4f9a0b5070

## Affected products and versions

- ai-sdlc-framework / ai-sdlc (%40ai-sdlc/plugin-mcp-server): ≥ 0; ≤ 0.31.2 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.5 (high); CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CVSS 4.0: 8.5 (high); CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: 0.69% as of 2026-11-02; percentile 52.68%

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

- Weaknesses: CWE-78

## Exploit evidence

- exploit: https://github.com/ai-sdlc-framework/ai-sdlc/issues/1970 (ADP: CISA-ADP)

## References

- https://github.com/ai-sdlc-framework/ai-sdlc/issues/1970 (CNA: VulnCheck; issue-tracking)

- https://github.com/ai-sdlc-framework/ai-sdlc (CNA: VulnCheck; product)

- https://github.com/ai-sdlc-framework/ai-sdlc/commit/717d7ecf068b714f65955e50fcf5cb4f9a0b5070 (CNA: VulnCheck; patch)

- https://github.com/ai-sdlc-framework/ai-sdlc/blob/ai-sdlc-plugin-v0.31.2/ai-sdlc-plugin/mcp-server/src/tools/check-issue.ts#L15-L19 (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/ai-sdlc-mcp-server-through-0.31.2-command-injection-via-check-issue-and-check-pr-status (CNA: VulnCheck; third-party-advisory)

- https://github.com/ai-sdlc-framework/ai-sdlc/issues/1970 (ADP: CISA-ADP; exploit)

- https://github.com/ai-sdlc-framework/ai-sdlc (disclosure@vulncheck.com)

- https://github.com/ai-sdlc-framework/ai-sdlc/blob/ai-sdlc-plugin-v0.31.2/ai-sdlc-plugin/mcp-server/src/tools/check-issue.ts#L15-L19 (disclosure@vulncheck.com)

- https://github.com/ai-sdlc-framework/ai-sdlc/commit/717d7ecf068b714f65955e50fcf5cb4f9a0b5070 (disclosure@vulncheck.com)

- https://github.com/ai-sdlc-framework/ai-sdlc/issues/1970 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/ai-sdlc-mcp-server-through-0.31.2-command-injection-via-check-issue-and-check-pr-status (disclosure@vulncheck.com)

- https://github.com/ai-sdlc-framework/ai-sdlc/issues/1970 (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-117558; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-117558; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-117558; retrieved 2026-11-02; source updated Not reported

Revision: 13a64c6f31420b88babc063bbe3f098e6446f41db312b87e473706995c1439e3

Canonical: https://y2.dev/cve/CVE-2026-117558

## 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.