How severe is CVE-2026-55830?

CVE-2026-55830 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2026-55830 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-55830?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-55830 published?

CVE-2026-55830 was published on 2026-07-08 and last updated on 2026-07-10.

CVE-2026-55830

CVE-2026-55830 is a high-severity vulnerability with a CVSS 3.x base score of 8.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-184.

Key facts

Severity: High (CVSS 3.x base score 8.3)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-184
Published: 2026-07-08
Last modified: 2026-07-10

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.

Frequently asked questions

What is 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() 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.
How severe is CVE-2026-55830?: CVE-2026-55830 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2026-55830 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-55830?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-55830 published?: CVE-2026-55830 was published on 2026-07-08 and last updated on 2026-07-10.

References

Other CWE-184 vulnerabilities

CVE-2026-47392 — Critical (CVSS 9.9): PraisonAI is a multi-agent teams system. Prior to version 4.6.40 of PraisonAI, corresponding to version 1.6.40 of…
CVE-2026-28363 — Critical (CVSS 9.9): In OpenClaw before 2026.2.23, tools.exec.safeBins validation for sort could be bypassed via GNU long-option…
CVE-2026-74886 — Critical (CVSS 9.8): openssl_encrypt versions before 1.4.0 contain a plugin sandbox bypass vulnerability where the PluginImportGuard blocks…
CVE-2026-56315 — Critical (CVSS 9.8): picklescan before 1.0.4 fails to block at least seven Python standard library modules (including uuid, _osx_support,…
CVE-2026-53873 — Critical (CVSS 9.8): picklescan before 1.0.4 contains an incomplete blocklist for the profile module that fails to block the module-level…
CVE-2025-71323 — Critical (CVSS 9.8): picklescan before 0.0.33 fails to block the ctypes module, allowing attackers to achieve remote code execution by…

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