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CVE-2026-2394: Buffer Over-read vulnerability in RTI Connext Professional (Core Libraries) allows Overread Buffers

29
Routine
MEDIUM 6.5REMOTEUPGRADE

CVE-2026-2394 is a medium-severity flaw (CVSS 6.5) affecting connext professional. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer Over-read vulnerability in RTI Connext Professional (Core Libraries) allows Overread Buffers. This issue affects Connext Professional: from 7.4.0 before 7.7.0, from 7.0.0 before 7.3.1.1, from 6.1.0 before 6.1.2.34, from 6.0.0 before 6.0.*, from 5.3.0 before 5.3.*, from 5.2.0 before 5.2.*, from 4.3x before 5.1.*.

Why this priority

  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score6.5 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance0.2% (top 95%)
CISA exploited listNo
WeaknessCWE-126, CWE-125
Published2026-04-01
Last modified2026-09-22
Publisher (CNA): RTI · Vendor: rti

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Last updated 2026-09-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

rti connext professional UPGRADE
Affected: >= 4.3.0 and <= 5.2.3 · >= 5.3.0 and <= 5.3.1.45 · >= 6.0.0 and <= 6.0.1.40 · >= 6.1.0 and <= 6.1.2.27 · >= 7.0.0 and < 7.3.1.1 · >= 7.4.0 and < 7.7.0
Fixed in: 7.3.1.1, 7.7.0
Safe to downgrade to: a release before 4.3.0
1. Check installed version
apt-cache policy connext-professional || rpm -q connext-professional || connext-professional --version
2. UPGRADE to 7.3.1.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade connext-professional
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade connext-professional
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 4.3.0 (Debian / Ubuntu)
apt-cache madison connext-professional sudo apt install connext-professional=<VERSION_BEFORE_4.3.0> sudo apt-mark hold connext-professional
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list connext-professional sudo dnf downgrade connext-professional-<VERSION_BEFORE_4.3.0> sudo dnf versionlock add connext-professional
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-2026-2394?

connext professional: upgrade to 7.3.1.1, 7.7.0. Exact commands for each OS are on this page.

Is CVE-2026-2394 being exploited?

CVE-2026-2394 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-2026-2394 affect?

CVE-2026-2394 affects connext professional. Severity is medium (CVSS 6.5). Buffer Over-read vulnerability in RTI Connext Professional (Core Libraries) allows Overread Buffers. This issue affects Connext Professional: from 7.4.0 before 7.7.0, from 7.0.0 before 7.3.1.1, from 6.1.0 before 6.1.2.34, from 6.0.0 before

How urgent is CVE-2026-2394?

Priority 29/100. Remotely exploitable, no login, no user action

Related CVEs

References

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