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CVE-2026-58203VulnerabilityPublished Updated

oterm · pydantic-settings: NestedSecretsSettingsSource follows symlinks outside secrets_dir, enabling local file read and

Affects otermSource GCVE Database

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Authoritative record:CVE-2026-58203· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium : upgrade to 0.19.0_2 when convenient.

Data as of 1 Nov 2026, 01:52 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 0.19.0_2
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

What to do

Upgrade oterm to 0.19.0_2.

Affected software

ProductAffectedFixed in
Homebrewotermpkg:brew/otermOther threatsAffected
  • >=0.14.6_2 <0.19.0_2
Fixed in
  • 0.19.0_2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to pydantic-settings version 0.19.0_2 or later, which fixes the issue by preventing traversal of symlinked directories outside the configured secrets_dir and using a consistent, cycle-safe directory traversal for both size checking and loading. If upgrading is not immediately possible, ensure the secrets_dir is fully controlled by the application with no writable or attacker-influenced entries, or disable secrets_nested_subdir.

Description

The pydantic-settings library's NestedSecretsSettingsSource component, when used with secrets_nested_subdir=True, improperly follows symbolic links inside the configured secrets_dir that point outside this directory. This allows reading files outside the intended secrets directory into application settings, bypassing the configured secrets_dir_max_size limit. The flaw arises from inconsistent directory traversal methods used for size checking and loading secrets, enabling local file read and resource exhaustion via cyclic symlinks. The vulnerability requires the ability to place symlinks inside the secrets directory and is not remotely exploitable by itself. A fix is available in pydantic-settings version 0.19.0_2.

References

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