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CVE-2026-58203— NestedSecretsSettingsSource follows symlinks outside secrets_dir, enabling local file read and bypassing secrets_dir_max_size

Quick assessment

Affected
pydantic pydantic-settings
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Pydantic pydantic-settings是Pydantic组织的一个Python应用配置管理库。 pydantic-settings 2.12.0版本至2.14.2之前版本存在安全漏洞，该漏洞源于在配置的secrets_dir中读取文件时未正确验证符号链接，导致可读取secrets_dir之外的文件，并绕过secrets_dir_max_size保护。攻击者或低权限组件可能通过在可写或共享的secrets目录中放置条目来导致意外本地文件读取到设置中，并绕过加载大小限制。

CVSS 5.3 · Medium EPSS 0.18% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
pydantic pydantic-settings >= 2.12.0, < 2.14.2 affected
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I. Basic Information for CVE-2026-58203

Vulnerability Information
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Vulnerability Title
NestedSecretsSettingsSource follows symlinks outside secrets_dir, enabling local file read and bypassing secrets_dir_max_size
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
pydantic-settings 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pydantic pydantic-settings是Pydantic组织的一个Python应用配置管理库。 pydantic-settings 2.12.0版本至2.14.2之前版本存在安全漏洞，该漏洞源于在配置的secrets_dir中读取文件时未正确验证符号链接，导致可读取secrets_dir之外的文件，并绕过secrets_dir_max_size保护。攻击者或低权限组件可能通过在可写或共享的secrets目录中放置条目来导致意外本地文件读取到设置中，并绕过加载大小限制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pydantic pydantic-settings >= 2.12.0, < 2.14.2 -

II. Public POCs for CVE-2026-58203

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III. Intelligence Information for CVE-2026-58203

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Vendor Advisories for CVE-2026-58203 (1)

IV. Related Vulnerabilities

Same vendor: pydantic
Same weakness: CWE-22

V. Comments for CVE-2026-58203

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