Connext Professional: Out-of-bounds Read
CVE-2026-3894 is a critical-severity out-of-bounds read vulnerability in Connext Professional from RTI, with a CVSS 3.1 base score of 9.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 7.7.0, 7.3.1.3, 6.1.* as the first without the flaw, so updating Connext Professional to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.2% chance of exploitation within 30 days, which is low compared with other CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update Connext Professional to 7.7.0 or 7.3.1.3 or 6.1.* or 6.0.*, whichever matches your release line, or a later version.
- Read the advisory on rti.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| RTI | Connext Professional | 7.4.0 up to, but not including, 7.7.0; 7.0.0 up to, but not including, 7.3.1.3; 6.1.0 up to, but not including, 6.1.*; 6.0.0 up to, but not including, 6.0.*; 5.3.0 up to, but not including, 5.3.*; 5.2.0 up to, but not including, 5.2.*; 5.0.0 up to, but not including, 5.1.* | 7.7.0, 7.3.1.3, 6.1.*, 6.0.*, 5.3.*, 5.2.* |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 9.2 | Critical | CNA |
| CVSS 3.1 | 9.1 | Critical | NVD |
Official description
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.*.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
- rti.com/vulnerabilities/#cve-2026-3894Mitigation
Other vulnerabilities in Connext Professional
- 7.7 High severity
- 10.0 Critical severity
- 7.3 High severity
- 9.2 Critical severity
- 8.7 High severity
- 8.3 High severity
Recent Out-of-bounds Read vulnerabilities
- 8.2 High severity
- 7.8 High severity
- 7.3 High severity
- 9.1 Critical severity
- 7.1 High severity
- 7.1 High severity
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