# CVE-2026-75110: MemOS Authentication Bypass via Unset INTERNAL_SERVICE_SECRET

> Unauthenticated attackers can bypass authentication and gain full admin access if the INTERNAL_SERVICE_SECRET environment variable is unset in enabled auth deployments.

- **Severity:** Critical 9.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Aug 2026
- **Updated:** 24 Sep 2026
- **Also known as:** GHSA-v9vw-ccqp-q298

## What is CVE-2026-75110?

CVE-2026-75110 is a critical authentication bypass vulnerability in MemTensor MemOS, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-697 (Incorrect Comparison)

## Which versions are affected by CVE-2026-75110?


## How do I fix CVE-2026-75110?

No fix has been published for CVE-2026-75110 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-75110 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75110 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-75110 and fix it if it is affected.

What it is: CVE-2026-75110 is a critical authentication bypass vulnerability in MemTensor MemOS, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75110 exists.

Affected product: MemTensor MemOS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-75110/ (Markdown: https://insights.sbomify.com/CVE-2026-75110/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-75110
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-75110
- OSV: https://osv.dev/vulnerability/CVE-2026-75110

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-75110/
Summaries are generated and may contain mistakes; the official description above is the record.