GHSA-8MXQ-7XR7-2FXJ
Vulnerability from github – Published: 2026-04-03 21:42 – Updated: 2026-04-06 23:10Summary
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
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 1.6.2"
},
"package": {
"ecosystem": "PyPI",
"name": "jupyterhub-ltiauthenticator"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-34052"
],
"database_specific": {
"cwe_ids": [
"CWE-401",
"CWE-770"
],
"github_reviewed": true,
"github_reviewed_at": "2026-04-03T21:42:35Z",
"nvd_published_at": "2026-04-03T23:17:03Z",
"severity": "MODERATE"
},
"details": "## Summary\n\nThe 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.\n\n## Patches\n\n- upgrade jupyterhub-litauthenticator to 1.6.3",
"id": "GHSA-8mxq-7xr7-2fxj",
"modified": "2026-04-06T23:10:01Z",
"published": "2026-04-03T21:42:35Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/jupyterhub/ltiauthenticator/security/advisories/GHSA-8mxq-7xr7-2fxj"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34052"
},
{
"type": "PACKAGE",
"url": "https://github.com/jupyterhub/ltiauthenticator"
},
{
"type": "WEB",
"url": "https://github.com/jupyterhub/ltiauthenticator/releases/tag/1.6.3"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "LTI JupyterHub Authenticator: Unbounded Memory Growth via Nonce Storage (Denial of Service)"
}
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