CVE-2026-58203: pydantic-settings provides settings management using Pydantic

Routine

MEDIUM 5.3UPGRADE

CVE-2026-58203 is a medium-severity flaw (CVSS 5.3) affecting pydantic-settings. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-22, CWE-59, CWE-400
Published	2026-07-06
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: pydantic

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-06 16:16 UTCPublished CVE record published
2026-10-25 20:10 UTCUpdated Record last modified

pydantic pydantic-settings UPGRADE

Affected: >= 2.12.0 and < 2.14.2

Fixed in: 2.14.2

Safe to downgrade to: a release before 2.12.0

1. Check installed version

apt-cache policy pydantic-settings || rpm -q pydantic-settings || pydantic-settings --version

2. UPGRADE to 2.14.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pydantic-settings

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pydantic-settings

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.12.0 (Debian / Ubuntu)

apt-cache madison pydantic-settings sudo apt install pydantic-settings=<VERSION_BEFORE_2.12.0> sudo apt-mark hold pydantic-settings

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list pydantic-settings sudo dnf downgrade pydantic-settings-<VERSION_BEFORE_2.12.0> sudo dnf versionlock add pydantic-settings

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-58203?

pydantic-settings: upgrade to 2.14.2. Exact commands for each OS are on this page.

Is CVE-2026-58203 being exploited?

CVE-2026-58203 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-58203 affect?

CVE-2026-58203 affects pydantic-settings. Severity is medium (CVSS 5.3). 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 secre

How urgent is CVE-2026-58203?

Priority 26/100. Public exploit reference

References

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