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CVE-2026-22590— Fast-DDS Discovery Server: Out-of-Bounds Read & Heap Memory Disclosure via DATA_FRAG  sampleSize / fragmentsInSubmessage

Quick assessment

Affected
eProsima Fast-DDS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

eProsima Fast DDS 是 OMG（对象管理组）DDS（数据分发服务）标准的 C++ 实现。2.6.12、2.14.6、3.2.4、3.3.1 和 3.4.2 之前的版本在处理 RTPS 子消息时，存在可远程触发的越界读取（Out-of-Bounds Read）漏洞。 攻击者可以构造一个具有较大 但实际载荷较小的 消息，并设置 ，使接收方将该数据包视为最后一个分片（LAST fragment）。在“最后分片”的处理路径中，Fast-DDS 基于 计算 ，并在未验证 的情况下调用 。因此， 会读取已接收

CVSS 9.1 · Critical
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I. Basic Information for CVE-2026-22590

Vulnerability Information
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Vulnerability Title
Fast-DDS Discovery Server: Out-of-Bounds Read & Heap Memory Disclosure via DATA_FRAG  sampleSize / fragmentsInSubmessage
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
eProsima Fast-DDS < 2.6.12 -

II. Public POCs for CVE-2026-22590

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III. Intelligence Information for CVE-2026-22590

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Other References for CVE-2026-22590 (1)

IV. Related Vulnerabilities

Same product: Fast-DDS
Same vendor: eProsima
Same weakness: CWE-125

V. Comments for CVE-2026-22590

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