Critical · CVSS 9.3CVE-2026-75110

MemOS Authentication Bypass via Unset INTERNAL_SERVICE_SECRET

Answer in brief

CVE-2026-75110 records a Critical severity (CVSS 9.3) vulnerability in MemOS Authentication Bypass via Unset INTERNAL_SERVICE_SECRET. The current sources do not mark it as known exploited. The current feed maps MemTensor/MemOS (generic), MemTensor/MemOS (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 17, 2026Updated Sep 24, 2026Source checked Oct 2, 2026First seen by HOL Aug 17, 2026Material review Sep 24, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.3
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Not reported

Why this deserves its current priority

CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps MemTensor/MemOS (generic), MemTensor/MemOS (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
MemTensor/MemOSgeneric	0	Not reported
MemTensor/MemOSgeneric	>=0 <=2.0.30	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for MemTensor/MemOS, MemTensor/MemOS.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 17, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.