GHSA-8mxq-7xr7-2fxj

Suggest an improvement
Source
https://github.com/advisories/GHSA-8mxq-7xr7-2fxj
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-8mxq-7xr7-2fxj/GHSA-8mxq-7xr7-2fxj.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-8mxq-7xr7-2fxj
Aliases
  • CVE-2026-34052
Related
Published
2026-04-03T21:42:35Z
Modified
2026-04-06T23:18:49.760805Z
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
Database specific 
{
    "github_reviewed_at": "2026-04-03T21:42:35Z",
    "nvd_published_at": "2026-04-03T23:17:03Z",
    "cwe_ids": [
        "CWE-401",
        "CWE-770"
    ],
    "severity": "MODERATE",
    "github_reviewed": true
}
References

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
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.6.3

Affected versions

0.*
0.1
0.2
0.3
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

Database specific

last_known_affected_version_range 
"<= 1.6.2"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-8mxq-7xr7-2fxj/GHSA-8mxq-7xr7-2fxj.json"