CVE-2026-40110 (GCVE-0-2026-40110)
Vulnerability from cvelistv5
Published
2026-05-05 21:29
Modified
2026-07-22 12:08
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-777 - Regular Expression without Anchors
Summary
Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, the Origin header validation uses Python's re.match() to check incoming origins against the allow_origin_pat configuration value. Because re.match() only anchors at the start of the string and does not require a full match, a pattern intended to match only a trusted domain (e.g., trusted.example.com) will also match any origin that begins with that domain followed by additional characters (e.g., trusted.example.com.evil.com). An attacker who controls such a domain can bypass the CORS origin restriction and make cross-origin requests to the Jupyter Server API from an untrusted site. This issue has been fixed in version 2.18.0.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| jupyter-server | jupyter_server |
Version: <= 2.17.0 |
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This issue has been fixed in version 2.18.0.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-777\", \"description\": \"CWE-777: Regular Expression without Anchors\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-05-05T21:29:31.323Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-40110\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-22T12:08:40.428Z\", \"dateReserved\": \"2026-04-09T01:41:38.536Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-05-05T21:29:31.323Z\", \"assignerShortName\": \"GitHub_M\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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