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Jupyter Server has a CORS Origin Validation Bypass via `re.match()` in `allow_origin_pat`
Jupyter Server has a CORS Origin Validation Bypass via `re.match()` in `allow_origin_pat`
Affected packages
- jupyter-server— before 2.18.0
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- 0.34%
- EPSS percentile
- 26.7%
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs. This advisory is in the top 27%.
Sources
- https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-24qx-w28j-9m6p
- https://nvd.nist.gov/vuln/detail/CVE-2026-40110
- https://github.com/jupyter-server/jupyter_server/pull/603
- https://github.com/jupyter-server/jupyter_server/commit/057869a327c46730afede3eab0ca2d2e3e74acea
- https://github.com/jupyter-server/jupyter_server/commit/49b34392feaa97735b3b777e3baf8f22f2a14ed8
- https://access.redhat.com/errata/RHSA-2026:43038
- https://access.redhat.com/security/cve/CVE-2026-40110
- https://bugzilla.redhat.com/show_bug.cgi?id=2466912
- https://github.com/jupyter-server/jupyter_server
- https://github.com/pypa/advisory-database/tree/main/vulns/jupyter-server/PYSEC-2026-2187.yaml
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40110.json
Structured record: https://osv.dev/vulnerability/GHSA-24qx-w28j-9m6p
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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