PYSEC-2026-2533
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/jupyterhub-ltiauthenticator/PYSEC-2026-2533.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-2533
- Aliases
- Published
- 2026-07-13T14:36:47.380994Z
- Modified
- 2026-07-13T16:31:58.992014411Z
- Severity
-
- 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)
- Details
-
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
-
- https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-8mxq-7xr7-2fxj
- https://nvd.nist.gov/vuln/detail/CVE-2026-34052
- https://github.com/jupyterhub/ltiauthenticator
- https://github.com/jupyterhub/ltiauthenticator/releases/tag/1.6.3
- https://pypi.org/project/jupyterhub-ltiauthenticator
- https://github.com/advisories/GHSA-8mxq-7xr7-2fxj
Affected packages
PyPI / jupyterhub-ltiauthenticator
Package
- Name
- jupyterhub-ltiauthenticator
- View open source insights on deps.dev
- Purl
- pkg:pypi/jupyterhub-ltiauthenticator
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed1.6.3