# CVE-2026-75110

## Summary

- **CVE ID:** CVE-2026-75110
- **Severity:** CRITICAL
- **CVSS Score:** 9.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-697
- **Published:** Aug 17, 2026
- **Last Modified:** Aug 18, 2026

## Description

MemOS is a memory operating system for LLMs and AI agents. In deployments where authentication is enabled (AUTH_ENABLED=true) but the undocumented, defaultless INTERNAL_SERVICE_SECRET environment variable is unset, the is_internal_request() check in src/memos/api/middleware/auth.py fails open: os.getenv("INTERNAL_SERVICE_SECRET") returns None and a request omitting the X-Internal-Service header also yields None, so the comparison None == None evaluates true. The request is then treated as a trusted internal principal and granted scopes: ["all"]. As a result, an unauthenticated remote attacker can reach the admin API-key management endpoints to mint API keys for any user, enumerate keys, revoke keys, and generate a master key for persistent privileged access, as well as all data endpoints.

## Affected Products

- MemTensor — MemOS (0)

## References

- [CNA](https://github.com/MemTensor/MemOS/issues/2259)
- [CNA](https://github.com/MemTensor/MemOS)
- [CNA](https://github.com/MemTensor/MemOS/blob/main/src/memos/api/middleware/auth.py)
- [CNA](https://www.vulncheck.com/advisories/memos-authentication-bypass-via-unset-internal-service-secret)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.52%
- **EPSS Percentile:** 42.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._