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high advisory

CVE-2026-4926: Regular Expression Denial of Service

CVE-2026-4926 describes a denial-of-service vulnerability due to an inefficient regular expression complexity issue when handling multiple sequential optional groups, leading to exponential growth and resource exhaustion.

denial-of-service regex cve
2r 2t
high advisory

Jupyter Server CORS Origin Validation Bypass via Regex

Jupyter Server versions 2.17.0 and earlier are vulnerable to a CORS origin validation bypass due to improper use of `re.match()` in validating the Origin header against the `allow_origin_pat` configuration, allowing attackers to bypass CORS restrictions.

jupyter-server cors origin-validation regex web-application
2r 1t