CVE-2026-70388: SOEM version 2.0.0 and earlier contains vulnerabilities where a malicious device on the network can send speci

Q: How do I fix CVE-2026-70388?

soem: upgrade to 2.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-70388 being exploited?

CVE-2026-70388 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-70388 affect?

CVE-2026-70388 affects soem. Severity is high (CVSS 8.3). SOEM version 2.0.0 and earlier contains vulnerabilities where a malicious device on the network can send specially crafted messages that cause the master to write data outside allocated memory boundaries. The software performs arithmetic on

Routine

HIGH 8.3UPGRADE

CVE-2026-70388 is a high-severity flaw (CVSS 8.3) affecting soem. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SOEM version 2.0.0 and earlier contains vulnerabilities where a malicious device on the network can send specially crafted messages that cause the master to write data outside allocated memory boundaries. The software performs arithmetic on message length values without proper validation, allowing negative or extremely large values to bypass safety checks. This can corrupt memory and potentially allow an attacker to execute arbitrary code on the

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.3 (High)
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-191, CWE-195, CWE-787
Published	2026-10-26
Last modified	2026-10-26

Publisher (CNA): ENISA · Vendor: rt-labs ab · Source: CVE Program record (NVD analysis pending)

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

Am I affected?

Timeline

2026-10-26 08:34 UTCPublished CVE record published
2026-10-26 08:34 UTCUpdated Record last modified

rt-labs ab soem UPGRADE

Affected: < 2.0.1

Fixed in: 2.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.0.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade soem

Note

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

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-2026-70388?

soem: upgrade to 2.0.1. Exact commands for each OS are on this page.

Is CVE-2026-70388 being exploited?

CVE-2026-70388 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-2026-70388 affect?

CVE-2026-70388 affects soem. Severity is high (CVSS 8.3). SOEM version 2.0.0 and earlier contains vulnerabilities where a malicious device on the network can send specially crafted messages that cause the master to write data outside allocated memory boundaries. The software performs arithmetic on

How urgent is CVE-2026-70388?

Priority 29/100. High severity

References

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