CVE-2026-58203: pydantic Path Traversal

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS — Exploit Prediction

0.0014

Probability of exploitation

0.04%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-22 Path Traversal

CWE-59 CWE-59

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
pydantic	pydantic	2.12.0 — 2.14.2

References

Advisories & Patches

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

Exploits

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

Frequently Asked Questions

What is CVE-2026-58203? +

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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-58203? +

CVE-2026-58203 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0014, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-58203? +

CVE-2026-58203 affects products from pydantic, specifically: pydantic. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-58203? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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