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GHSA-8mxq-7xr7-2fxj

LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-34052

Packages

EcosystemPackageAffectedFixed in
PyPI jupyterhub-ltiauthenticator < 1.6.3 1.6.3

Details

As written in the advisory (Markdown source, shown as plain text).

## Summary The LTI 1.1 validator stores OAuth nonces in a class-level dictionary that grows without bounds. Nonces are added before signature validation, so an attacker with knowledge of a valid consumer key can send repeated requests with unique nonces to gradually exhaust server memory, causing a denial of service. ## Patches - upgrade jupyterhub-litauthenticator to 1.6.3

References

External links from the advisory. They lead to third-party sites.