Vulnerability in Memtensor Memos
CVE-2026-75110
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (49.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.001
Affected products
- Memtensor Memos — versions 0
Weakness classification (CWE)
References
- github.com/MemTensor/MemOS/issues/2259 (issue-tracking)
- github.com/MemTensor/MemOS (product)
- github.com/MemTensor/MemOS/blob/main/src/memos/api/middleware/auth.py (technical-description)
- www.vulncheck.com/advisories/memos-authentication-bypass-via-unset-internal-ser… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-75110?
- CVE-2026-75110 is a critical-severity vulnerability in Memtensor Memos, classified under Incorrect Comparison. CVSS score: 9.8/10. Published 2026-08-17.
- How severe is CVE-2026-75110?
- Critical severity. CVSS v3 base score is 9.8 out of 10.