CVE-2026-34052

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Source
https://cve.org/CVERecord?id=CVE-2026-34052
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-34052.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-34052
Aliases
Downstream
Related
Published
2026-04-03T22:04:10.519Z
Modified
2026-05-18T11:54:52.749033524Z
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

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.

Database specific 
{
    "cwe_ids": [
        "CWE-401",
        "CWE-770"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34052.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/jupyterhub/ltiauthenticator

Affected ranges

Type
GIT
Repo
https://github.com/jupyterhub/ltiauthenticator
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
4fb95e2b72ec87c2000c5b6ea1968479c1a82382

Affected versions

0.*
0.4.0
1.*
1.0.0
1.1.0
1.2.0
1.3.0
1.4.0
1.5.0
1.5.1
1.6.0
1.6.1
1.6.2
v0.*
v0.3

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-34052.json"