HOMEVULNERABILITIESCVE-2026-42085
MEDIUM

CVE-2026-42085

CWE-23Published: May 4, 2026· Updated: May 8, 2026

4.3
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:11.8th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-42085 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected Vendors & Products

openc31 product
cosmos
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5
PATCHhttps://github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42
ADVISORYhttps://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h
ADVISORYhttps://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h

All References (6)

→
https://github.com/OpenC3/cosmos/commit/9957a9fa460c0c0cf5cdbf6a5931bbdd025246a5Patch
→
https://github.com/OpenC3/cosmos/commit/e6efccbd148ba0e3361c5891027f2373aa140d42Patch
→
https://github.com/OpenC3/cosmos/releases/tag/v6.10.5Release Notes
→
https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3Release Notes
→
https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45hExploit · Vendor Advisory
→
https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45hExploit · Vendor Advisory

Quick Facts

CVE IDCVE-2026-42085
CVSS Score4.3 / 10
SeverityMEDIUM
WeaknessCWE-23
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedMay 4, 2026

Related CVEs (CWE-23)

CVE-2026-8326
10.0
CVE-2026-33494
10.0
CVE-2025-62878
9.9
CVE-2026-21659
9.8
CVE-2026-22070
9.8
CVE-2026-41948
9.4

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-42085 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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