CVE catalog
CVE-2026-55830
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() reject
- Severity
- High · CVSS 8.3
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:L - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.40% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | restrictedpython | sid | 8.4-1 | fixed |
| Debian | restrictedpython | forky | 8.4-1 | fixed |
| Debian | restrictedpython | trixie | 8.0-1 | vulnerable |
| Debian | restrictedpython | bookworm | 4.0~b3-3 | vulnerable |
| Pip | RestrictedPython | Not reported | 8.3 | fixed |
| Ubuntu | restrictedpython | 16.04 | 3.6.0-0ubuntu4 | vulnerable |
| Ubuntu | restrictedpython | 18.04 | 3.6.0-0ubuntu4 | vulnerable |
| Ubuntu | restrictedpython | pro | 4.0~b3-3 | vulnerable |
| Ubuntu | restrictedpython | pro | 6.2-1 | vulnerable |
| Ubuntu | restrictedpython | pro | 6.2-1ubuntu0.24.04.1~esm1 | vulnerable |
| Ubuntu | restrictedpython | 26.04 | 8.0-1 | vulnerable |
| Ubuntu | restrictedpython | 26.04 | 8.1-1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | restrictedpython | source | sid | 8.4-1 | not yet assigned | Not reported | Not reported |
| Debian | restrictedpython | source | forky | 8.4-1 | not yet assigned | Not reported | Not reported |
| Debian | restrictedpython | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | restrictedpython | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Pip | RestrictedPython | pip | Not reported | 8.3 | Not reported | GHSA-FFG3-P8FM-MJX2 | Not reported |
Notes
[trixie] restrictedpython: Minor issue [bookworm] restrictedpython: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-restrictedpython]Affected
Source package: [restrictedpython]
Details (2)
4.0~b3-3· all · bookwormAffected
nvd · restrictedpython · debian · bookworm; nvd · restrictedpython · debian · 12
4.0~b3-3· all · bookwormAffected
nvd · restrictedpython · debian · bookworm; nvd · restrictedpython · debian · 12
[Debian 13 (Trixie)]
- [python3-restrictedpython]Affected
Source package: [restrictedpython]
Details (2)
8.0-1· all · trixieAffected
nvd · restrictedpython · debian · 13
8.0-1· all · trixieAffected
nvd · restrictedpython · debian · 13
Observed:
References
- [https://github.com/advisories/GHSA-ffg3-p8fm-mjx2]
- [https://github.com/zopefoundation/RestrictedPython/commit/3737596ec9f28c34a073cc845bd2f4c0a80cb671]
- [https://github.com/zopefoundation/RestrictedPython/security/advisories/GHSA-ffg3-p8fm-mjx2]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-55830]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-55830]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-55830]
- [https://security-tracker.debian.org/tracker/CVE-2026-55830]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]