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CVE-2026-42085

MEDIUM · CVSS 4.3 · Analyzed

Published: 2026-05-04 · Updated: 2026-10-26 · Source: NVD

Stored catalog record

Source record retrieved 2026-10-28T10:19:58.154344+00:00. Scheduled imports handle updates; this page does not assert that the provider was queried just now.

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Vulnerability overview

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to versions 6.10.5 and 7.0.0-rc3, OpenC3 COSMOS contains a design flaw in the save_tool_config() function that allows saving tool configuration files at arbitrary locations inside the shared /plugins directory tree by supplying crafted configuration filenames. Although the implementation sufficiently mitigates standard path traversal attacks, by canonicalizing filename to an absolute path, all plugins share this same root directory. That enables users to create arbitrary file structures and overwrite existing configuration files within the shared /plugins directory. This issue has been patched in versions 6.10.5 and 7.0.0-rc3.

Patch review priority

Assess exposure and vendor guidance

  • No higher-priority signal is available in the current stored evidence.

FIRST EPSS: 0.31% · percentile 24.2 · score date 2026-10-28.

EPSS estimates probability of exploitation in the next 30 days. It does not measure your exposure or prove exploitation. The elevated threshold is 10%; CISA KEV takes precedence. About FIRST EPSS ↗

Severity and scoring

CVSS score
4.3 · MEDIUM
CVSS version
3.1
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Weaknesses
CWE-23

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Not listed in the CISA catalog retrieved for this record. This does not establish that exploitation has not occurred.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:a:openc3:cosmos:*:*:*:*:open_source:*:*:*

    Before (exclusive): 6.10.5

  • cpe:2.3:a:openc3:cosmos:7.0.0:rc1:*:*:open_source:*:*:*

  • cpe:2.3:a:openc3:cosmos:7.0.0:rc2:*:*:open_source:*:*:*

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

Explore official sources

Read the official NVD record ↗

Explore the CISA catalog ↗

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