CVE-2026-7300 Overview
CVE-2026-7300 is a classic buffer overflow [CWE-120] in the Web Integration Service component of RTI Connext Professional. The vulnerability stems from copying input data into a fixed-size buffer without checking its length. An unauthenticated attacker can reach the affected code path over the network and trigger a filter failure, leading to availability impact on the service.
The issue affects Connext Professional versions from 7.4.0 before 7., from 7.0.0 before 7.3.1.3, and from 6.1.2 before 6.1.. RTI has published an advisory describing the impacted releases and remediation guidance.
Critical Impact
Network-reachable buffer overflow in the Web Integration Service that an unauthenticated attacker can trigger to disrupt the service and corrupt processed data.
Affected Products
- RTI Connext Professional 7.4.0 up to (but not including) the 7.* fix release
- RTI Connext Professional 7.0.0 up to (but not including) 7.3.1.3
- RTI Connext Professional 6.1.2 up to (but not including) the 6.1.* fix release
Discovery Timeline
- 2026-06-17 - CVE-2026-7300 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2026-7300
Vulnerability Analysis
The Web Integration Service in RTI Connext Professional exposes Data Distribution Service (DDS) data over HTTP and WebSocket interfaces. The component copies attacker-controlled input into a fixed-size buffer without validating the input length. When the supplied data exceeds the destination buffer, memory adjacent to the buffer is overwritten.
The immediate observable outcome is a filter failure within the service, which the advisory categorizes as Filter Failure through Buffer Overflow. The attack vector is network-based, requires no authentication, and requires no user interaction. The primary impact is on availability, with limited impact to confidentiality and integrity of data the service processes.
Root Cause
The root cause is a missing length check before a memory copy operation, the canonical pattern described by CWE-120 (Buffer Copy without Checking Size of Input). The destination buffer has a fixed compile-time size while the source data is taken from an untrusted network input field. Without an explicit bounds check or use of a length-aware copy primitive, oversized input writes past the buffer boundary.
Attack Vector
An attacker sends a crafted request to a Web Integration Service endpoint reachable on the network. The request contains an input field whose length exceeds the fixed buffer in the parsing routine. Processing the field overruns the buffer, causing the filter to fail and the service to behave incorrectly or terminate.
No authentication or user interaction is required. Verified proof-of-concept code is not currently published. Refer to the RTI Vulnerability Overview for technical details.
Detection Methods for CVE-2026-7300
Indicators of Compromise
- Unexpected crashes, restarts, or filter-failure error messages logged by the RTI Web Integration Service process.
- Inbound HTTP or WebSocket requests to the Web Integration Service containing abnormally long header values or payload fields.
- Network traffic to Web Integration Service endpoints from sources outside the expected DDS client population.
Detection Strategies
- Monitor Web Integration Service logs for repeated parsing or filter errors that correlate with external requests.
- Inspect HTTP and WebSocket traffic for oversized request fields targeting Connext endpoints using an IDS or web application firewall.
- Correlate process termination events on hosts running Connext with preceding network requests to the service port.
Monitoring Recommendations
- Forward Connext service logs and host process events to a centralized log platform for retention and correlation.
- Alert on service restart loops or repeated abnormal exits of the Web Integration Service binary.
- Track inventory of hosts running affected Connext Professional versions and validate patch status on each cycle.
How to Mitigate CVE-2026-7300
Immediate Actions Required
- Identify all systems running RTI Connext Professional in the affected version ranges and prioritize them for patching.
- Restrict network access to the Web Integration Service to trusted management networks using firewall rules or network segmentation.
- Disable the Web Integration Service on deployments that do not require HTTP or WebSocket access to DDS data.
Patch Information
Upgrade to a fixed release as listed in the RTI Vulnerability Overview. For the 7.0.x branch, update to 7.3.1.3 or later. For the 7.4.x and 6.1.x branches, apply the corresponding fix release identified in the RTI advisory. Validate patched versions in a staging environment before production rollout.
Workarounds
- Place the Web Integration Service behind a reverse proxy or WAF that enforces strict size limits on request headers and body fields.
- Apply ACLs at the network layer to allow only known DDS client addresses to reach the service.
- Stop and disable the Web Integration Service on hosts where the feature is not in active use until a patched release is deployed.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
