CVE-2026-77936 Letta through 0.16.8 Insecure Default Configuration Unauthenticated API and PostgreSQL Access
Critical 9.3
Published
Updated
Check this codebase for CVE-2026-77936 and fix it if it is affected.
What it is: CVE-2026-77936 is a critical vulnerability in letta-ai letta, published on 20 Oct 2026.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77936 exists.
Affected product: letta-ai letta. 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-2026-77936/ (Markdown: https://insights.sbomify.com/CVE-2026-77936/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-77936?
CVE-2026-77936 is a critical vulnerability in letta-ai letta, published on 20 Oct 2026.
Official description
Letta through 0.16.8 ships a compose.yaml that does not enable LETTA_SERVER_SECURE, so the password middleware is never added and all API routes are unauthenticated, and it exposes a superuser PostgreSQL port with default credentials. Remote attackers can execute arbitrary Python via POST /v1/tools/run, manage /v1/admin users, or run OS commands via COPY PROGRAM.
Weakness: CWE-1188
Which versions are affected by CVE-2026-77936?
How do I fix CVE-2026-77936?
No fix has been published for CVE-2026-77936 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-77936 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77936 exists.
Sources
Also known as GHSA-g524-hhf9-5x95.