Vulnerability Description
pydantic-settings provides settings management using Pydantic. From 2.12.0 until 2.14.2, NestedSecretsSettingsSource reads secret values from files in a configured secrets_dir. When secrets_nested_subdir=True, a directory entry inside secrets_dir that is a symbolic link pointing outside secrets_dir is followed, so files outside the configured directory are read into settings values. The same code path bypasses the documented secrets_dir_max_size protection. An attacker or lower-privileged component able to influence entries in the configured secrets directory (for example, a writable or shared secrets mount) can turn this into an unintended local file read into settings and can defeat the advertised loading-size cap. This vulnerability is fixed in 2.14.2.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pydantic | Pydantic-Settings | >= 2.12.0, < 2.14.2 |
Related Weaknesses (CWE)
References
- https://github.com/pydantic/pydantic-settings/security/advisories/GHSA-4xgf-cpjxExploitMitigationVendor Advisory
- https://github.com/pydantic/pydantic-settings/security/advisories/GHSA-4xgf-cpjxExploitMitigationVendor Advisory
FAQ
What is CVE-2026-58203?
CVE-2026-58203 is a vulnerability with a CVSS score of 5.3 (MEDIUM). pydantic-settings provides settings management using Pydantic. From 2.12.0 until 2.14.2, NestedSecretsSettingsSource reads secret values from files in a configured secrets_dir. When secrets_nested_sub...
How severe is CVE-2026-58203?
CVE-2026-58203 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-58203?
Check the references section above for vendor advisories and patch information. Affected products include: Pydantic Pydantic-Settings.