Integer underflow in Fast DDS - #VU162814
Published: November 9, 2026
Vulnerability identifier: #VU162814
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to crash a Fast RTPS reader process, causing denial of service.
The vulnerability exists due to an unsigned integer underflow in DATA_FRAG handling when fragmentStartingNum is zero, bypassing bounds checks and enabling an out-of-bounds write. An unauthenticated remote attacker can send one crafted UDP packet to a reachable matched reader using observed reader and writer identifiers and a sequence number within the reader's receive window to trigger the crash.
Affected software
Fast DDS
Remediation
Install security update from vendor's website.
Fast DDS - update to 2.0.0