{"cve":"CVE-2026-55830","nvd":{"published":"2026-07-08T22:17:15.653","modified":"2026-10-25T17:10:00.197","status":"Deferred","description":"RestrictedPython is a tool that helps to define a subset of the Python language which allows to provide a program input into a trusted environment. Prior to 8.3, check_function_argument_names() rejected protected guard hook names for regular, variadic, and keyword-only arguments but omitted positional-only arguments, allowing __getattr__, _getitem_, _write_, or _print_ to be shadowed by a local parameter and bypass the embedding application's access policy. This issue is fixed in version 8.3.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L","score":8.3},"cwes":["CWE-184"],"references":["https://github.com/zopefoundation/RestrictedPython/commit/3737596ec9f28c34a073cc845bd2f4c0a80cb671","https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-ffg3-p8fm-mjx2","https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-ffg3-p8fm-mjx2"],"products":[],"source":"nvd","synced_at":"2026-10-25T17:50:06.907763985+00:00"},"epss":{"cve":"CVE-2026-55830","score":0.00401,"percentile":0.34038,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-ffg3-p8fm-mjx2","url":"https://osv.dev/vulnerability/GHSA-ffg3-p8fm-mjx2","summary":"RestrictedPython guard hooks can be shadowed via positional-only arguments","modified":"2026-09-10T12:25:49.189069232Z","packages":[{"ecosystem":"PyPI","name":"restrictedpython","purl":"pkg:pypi/restrictedpython","ranges":["<8.3"],"fixed":["8.3"]}]},{"id":"PYSEC-2026-3917","url":"https://osv.dev/vulnerability/PYSEC-2026-3917","summary":"RestrictedPython guard hooks can be shadowed via positional-only arguments","modified":"2026-09-10T12:15:11.823892521Z","packages":[{"ecosystem":"PyPI","name":"restrictedpython","purl":"pkg:pypi/restrictedpython","ranges":["<8.3"],"fixed":["8.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}