CVE-2026-42087: OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded

This month

CRITICAL 9.6UPGRADE

CVE-2026-42087 is a critical-severity flaw (CVSS 9.6) affecting cosmos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From version 6.7.0 to before version 7.0.0-rc3, a SQL injection vulnerability exists in the Time-Series Database (TSDB) component of COSMOS. The tsdb_lookup function in the cvt_model.rb file directly places user-supplied input into a SQL query without sanitizing the input. As a result, a user can break out of the initial SQL sta

Why this priority

Critical severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 75%)
CISA exploited list	No
Weakness	CWE-89
Published	2026-05-04
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: openc3

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-04 18:16 UTCPublished CVE record published
2026-10-26 19:10 UTCUpdated Record last modified

openc3 cosmos UPGRADE

Affected: >= 6.7.0 and < 7.0.0 · 7.0.0 rc1 · 7.0.0 rc2

Fixed in: 7.0.0

Safe to downgrade to: a release before 6.7.0

1. Check installed version

apt-cache policy cosmos || rpm -q cosmos || cosmos --version

2. UPGRADE to 7.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cosmos

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cosmos

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 6.7.0 (Debian / Ubuntu)

apt-cache madison cosmos sudo apt install cosmos=<VERSION_BEFORE_6.7.0> sudo apt-mark hold cosmos

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

dnf --showduplicates list cosmos sudo dnf downgrade cosmos-<VERSION_BEFORE_6.7.0> sudo dnf versionlock add cosmos

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-2026-42087?

cosmos: upgrade to 7.0.0. Exact commands for each OS are on this page.

Is CVE-2026-42087 being exploited?

CVE-2026-42087 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-2026-42087 affect?

CVE-2026-42087 affects cosmos. Severity is critical (CVSS 9.6). OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. From version 6.7.0 to before version 7.0.0-rc3, a SQL injection vulnerability exists in the Time-Series Database (TSDB)

How urgent is CVE-2026-42087?

Priority 45/100. Critical severity; Public exploit reference

Related CVEs

CVE-2026-42088 CRITICAL 9.6 UPGRADE OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded
CVE-2026-42084 HIGH 8.1 UPGRADE OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded
CVE-2026-42085 MEDIUM 4.3 UPGRADE OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded
CVE-2026-42086 MEDIUM 4.6 UPGRADE OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded

References

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