CVE-2026-114135High· 8.8▾ TwilightA flaw was found in jupyter-server. When configured with a gateway connection, the server validates user authentication but fails to verify whether the user has permission to run actions on computational kernels. A remote authenticated use…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 23.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
Last analysed / modified upstream
0.4%
0.4% → 0.5%
A flaw was found in jupyter-server. When configured with a gateway connection, the server validates user authentication but fails to verify whether the user has permission to run actions on computational kernels. A remote authenticated user with restricted privileges can exploit this flaw to open an unauthorized communication channel to an active kernel. This issue allows an attacker to execute arbitrary code, access sensitive credentials and data, or disrupt server environments.
jupyter-server: jupyter-server: Unauthorized code execution via missing authorization check in gateway handler — rated Important by Red Hat. Released 2026-10-21, updated 2026-10-23.
Affected:
No fix planned:
Not affected:
Affected
Affected packages:
jupyter-server >= 2.0.0, < 2.6.0Patched in:
jupyter-server 2.6.0Connected by shared product, vendor, weakness, or advisory.
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