CVSS 3.1
5.9 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-34052
Medium (5.9) in jupyter lti jupyterhub authenticator. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in jupyterhub-ltiauthenticator 1.6.3.
LTI JupyterHub Authenticator is a JupyterHub authenticator for LTI. Prior to version 1.6.3, 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. This issue has been patched in version 1.6.3.
Severity
- EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 27% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-401, CWE-770
- Published
- Modified
- Record from
- the NVD, synced
Affected
- jupyter:lti_jupyterhub_authenticator
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-8mxq-7xr7-2fxj | PyPI | jupyterhub-ltiauthenticator | <1.6.3 | 1.6.3 |
| PYSEC-2026-2533 | PyPI | jupyterhub-ltiauthenticator | <1.6.3 | 1.6.3 |