SB20261109103 - Integer underflow in Fast DDS

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Main Vulnerability Database SB20261109103

SB20261109103 - Integer underflow in Fast DDS

Published: November 9, 2026

Security Bulletin ID SB20261109103
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Integer underflow (CVE-ID: N/A)

CWE-ID: CWE-191 - Integer underflow

CVSSv4: 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]


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.


Remediation

Install update from vendor's website.

References