# CVE-2026-22590

## Summary

- **CVE ID:** CVE-2026-22590
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H)
- **CWE:** CWE-125, CWE-131
- **Published:** Sep 9, 2026
- **Last Modified:** Sep 9, 2026

## Description

eprosima Fast DDS is a C++ implementation of the DDS (Data Distribution Service) standard of the OMG (Object Management Group). Versions prior to 2.6.12, 2.14.6, 3.2.4, 3.3.1, and 3.4.2 have a remotely triggerable Out-of-Bounds Read while processing RTPS `DATA_FRAG` submessages. An attacker can craft a `DATA_FRAG` with a large `sampleSize` but a small actual payload, and set `fragmentsInSubmessage` such that the receiver treats the packet as the LAST fragment**. In this LAST-fragment path, Fast-DDS computes `incoming_length` based on `sampleSize` and calls `memcpy()` without validating `incoming_data.length >= incoming_length`. As a result, `CacheChange_t::add_fragments()` reads past the received UDP datagram buffer and into adjacent heap memory, copying those bytes into the reassembly buffer. In a Discovery Server deployment, the resulting `CacheChange_t` can be relayed to other participants, meaning that a newly joining participant may receive leaked heap memory (e.g., pointer values that could aid ASLR bypass). Versions 2.6.12, 2.14.6, 3.2.4, 3.3.1, and 3.4.2 fix the issue.

## Affected Products

- eProsima — Fast-DDS (< 2.6.12)
- eProsima — Fast-DDS (>= 2.7.0, < 2.14.6)
- eProsima — Fast-DDS (>= 3.0.0, < 3.2.4)
- eProsima — Fast-DDS (>= 3.3.0, < 3.3.1)
- eProsima — Fast-DDS (>= 3.4.0, < 3.4.2)

## References

- [CNA](https://github.com/eProsima/Fast-DDS/security/advisories/GHSA-7r7h-hwfj-q626)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.38%
- **EPSS Percentile:** 31.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._