{"cve":"CVE-2026-34052","nvd":{"published":"2026-04-03T23:17:03.777","modified":"2026-07-24T22:10:00.140","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9},"cwes":["CWE-401","CWE-770"],"references":["https://github.com/jupyterhub/ltiauthenticator/releases/tag/1.6.3","https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-8mxq-7xr7-2fxj"],"products":["jupyter:lti_jupyterhub_authenticator"],"source":"nvd","synced_at":"2026-10-19T22:28:59.047572785+00:00"},"epss":{"cve":"CVE-2026-34052","score":0.00342,"percentile":0.27694,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-8mxq-7xr7-2fxj","url":"https://osv.dev/vulnerability/GHSA-8mxq-7xr7-2fxj","summary":"LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)","modified":"2026-09-10T03:51:01.296535015Z","packages":[{"ecosystem":"PyPI","name":"jupyterhub-ltiauthenticator","purl":"pkg:pypi/jupyterhub-ltiauthenticator","ranges":["<1.6.3"],"fixed":["1.6.3"]}]},{"id":"PYSEC-2026-2533","url":"https://osv.dev/vulnerability/PYSEC-2026-2533","summary":"LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)","modified":"2026-07-13T16:31:58.992014411Z","packages":[{"ecosystem":"PyPI","name":"jupyterhub-ltiauthenticator","purl":"pkg:pypi/jupyterhub-ltiauthenticator","ranges":["<1.6.3"],"fixed":["1.6.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}