CVE-2026-3894: Out-of-bounds Read vulnerability in RTI Connext Professional (Core Libraries) allows Overread Buffers

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-3894 is a critical-severity flaw (CVSS 9.1) affecting connext professional. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Out-of-bounds 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 7.3.1.3, from 6.1.0 before 6.1.*, from 6.0.0 before 6.0.*, from 5.3.0 before 5.3.*, from 5.2.0 before 5.2.*, from 5.0.0 before 5.1.*.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-06-17
Last modified	2026-10-25

Publisher (CNA): RTI · Vendor: rti

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-17 18:17 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

rti connext professional UPGRADE

Affected: >= 5.0.0 and < 7.7.0

Fixed in: 7.7.0

Safe to downgrade to: a release before 5.0.0

1. Check installed version

apt-cache policy connext-professional || rpm -q connext-professional || connext-professional --version

2. UPGRADE to 7.7.0 (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 5.0.0 (Debian / Ubuntu)

apt-cache madison connext-professional sudo apt install connext-professional=<VERSION_BEFORE_5.0.0> 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_5.0.0> 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-2026-3894?

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

Is CVE-2026-3894 being exploited?

CVE-2026-3894 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-2026-3894 affect?

CVE-2026-3894 affects connext professional. Severity is critical (CVSS 9.1). Out-of-bounds 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 7.3.1.3, from 6.1.0 before 6.1.*, from 6.0.0 before 6

How urgent is CVE-2026-3894?

Priority 39/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-7300 MEDIUM 6.5 UPGRADE Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in RTI Connext Profession

References

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