CVE-2026-30803
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedInteger Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro (Core Libraries) allows Overread Buffers.This issue affects Connext Micro: from 4.0.0 before 4.3.0.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceInteger underflow vulnerability in RTI Connext Micro core libraries allows buffer overread. The vulnerability stems from insufficient bounds checking during integer arithmetic operations, enabling an attacker to read memory beyond allocated buffers. This could lead to information disclosure or potentially facilitate further exploitation.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 4.0.0, < 4.3.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Locate RTI Connext Micro installationSearch for Connext Micro binaries or libraries on the system. Common locations include /opt/rti, /usr/local/rti, or installation directories specified during setup. Check for files named libnddsc.*, libnddscore.*, or the rticonnextmsg utility.Affected if RTI Connext Micro is installed on the system
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Identify installed versionRun the installed binary or check version files. Common methods: execute 'rtiddsgen -version' or check VERSION file in the installation directory, or inspect library version metadata using 'strings' or file properties on the core library files.Affected if Version cannot be determined or is ambiguous
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Compare version against vulnerable rangeCompare the identified version number to the affected range: versions 4.0.0 through 4.2.x are vulnerable. Version 4.3.0 and later are patched.Affected if Installed version is 4.0.0, 4.0.1, 4.1.0, 4.2.0, 4.2.1, or any 4.x version below 4.3.0
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Verify application uses vulnerable core librariesConfirm that applications or services linking against the Connext Micro libraries are actively running. Use 'ldd' on Linux or dependency walkers on Windows to verify linkage to the installed library version.Affected if Applications depend on the vulnerable library version and are actively processing network traffic
The environment is affected if RTI Connext Micro version 4.0.0 through 4.2.x is installed and actively running, with applications using the core libraries for DDS communications.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped4.3.0
Upgrade RTI Connext Micro to version 4.3.0 or later to resolve the integer underflow vulnerability. Given the critical CVSS score of 9.1, prioritize this upgrade in deployment cycles.
Connext Micro 4.3.0
- 1. Identify current RTI Connext Micro version by checking the installed libraries or product documentation
- 2. Obtain RTI Connext Micro version 4.3.0 or later from the official RTI download portal at www.rti.com
- 3. Review RTI Connext Micro 4.3.0 release notes for migration considerations
- 4. Test upgrade in a non-production/staging environment to verify compatibility with your application
- 5. Backup current configuration and deployment data
- 6. Deploy Connext Micro 4.3.0 to production environment
- 7. Verify the deployment and monitor for any issues
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation4.0 h
- Testing8.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-30803 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-30803 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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