Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L L N U H H N 8.1 .0044 36.6 —
AFFECTED Product Versions Fixed jupyter/jupyter unspecified – —
TIMELINE Apr 2 Reserved by @huntr_ai Jun 2 EXPLOIT PUBLISHED — CVE-2026-5422 (jupyter/jupyter). Public exploit reference added. Jun 2 Published (CNA: @huntr_ai)
A path traversal vulnerability exists in jupyter-server version 2.17.0 due to an incorrect root directory boundary check in the _get_os_path() function within jupyter_server/services/contents/fileio.py. The check uses startswith(root) without appending a trailing path separator, allowing sibling directories with names starting with the same prefix as root_dir to bypass the check. Additionally, the to_os_path() function in utils.py does not strip ".." from path parts, enabling traversal sequences to bypass the vulnerable check. This vulnerability can lead to unauthorized read/write access to files in sibling directories, potentially exposing sensitive data in shared hosting environments.
| Date | Event | Detail |
|---|---|---|
| April 2, 2026 | Reserved | Reserved by @huntr_ai |
| June 2, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-5422 (jupyter/jupyter). Public exploit reference added. |
| June 2, 2026 | Published | Published (CNA: @huntr_ai) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| jupyter | jupyter/jupyter | — | unspecified | — |
Authoritative record: CVE-2026-5422 at cve.org
Vendors: jupyter
Weaknesses: CWE-23
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-5422 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.