CVE-2026-30802: Out-of-bounds Read vulnerability in RTI Connext Micro (Core Libraries) allows Overread Buffers

Routine

HIGH 8.2REMOTEUPGRADE

CVE-2026-30802 is a high-severity flaw (CVSS 8.2) affecting connext micro. 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 Micro (Core Libraries) allows Overread Buffers. This issue affects Connext Micro: from 4.0.0 before 4.3.0, from 2.4.5 before 2.4.*.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-06-17
Last modified	2026-10-26

Publisher (CNA): RTI · Vendor: rti

Last updated 2026-10-26 · 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
2026-10-26 11:10 UTCUpdated Record last modified

rti connext micro UPGRADE

Affected: >= 2.4.5 and < 4.3.0

Fixed in: 4.3.0

Safe to downgrade to: a release before 2.4.5

1. Check installed version

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

2. UPGRADE to 4.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade connext-micro

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade connext-micro

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 2.4.5 (Debian / Ubuntu)

apt-cache madison connext-micro sudo apt install connext-micro=<VERSION_BEFORE_2.4.5> sudo apt-mark hold connext-micro

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

dnf --showduplicates list connext-micro sudo dnf downgrade connext-micro-<VERSION_BEFORE_2.4.5> sudo dnf versionlock add connext-micro

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-2026-30802?

connext micro: upgrade to 4.3.0. Exact commands for each OS are on this page.

Is CVE-2026-30802 being exploited?

CVE-2026-30802 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-2026-30802 affect?

CVE-2026-30802 affects connext micro. Severity is high (CVSS 8.2). Out-of-bounds Read vulnerability in RTI Connext Micro (Core Libraries) allows Overread Buffers. This issue affects Connext Micro: from 4.0.0 before 4.3.0, from 2.4.5 before 2.4.*.

How urgent is CVE-2026-30802?

Priority 38/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-30803 CRITICAL 9.1 UPGRADE Integer Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro (Core Libraries) allows Overread Buf

References

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