Vulnerability · Published Feb 3, 2026 · Assigned by GitHub_M
CVE-2025-64438Fast-DDS: Unbounded GAP range triggers OOM DoS under RELIABLE QoS
Low 1.7
In plain English
A low-severity infinite loop in Fast-DDS from eProsima. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).
Official description
Fast DDS is a C++ implementation of the DDS (Data Distribution Service) standard of the OMG (Object Management Group ). Prior to versions 3.4.1, 3.3.1, and 2.6.11, a remotely triggerable Out-of-Memory (OOM) denial-of-service exists in Fast -DDS when processing RTPS GAP submessages under RELIABLE QoS. By sending a tiny GAP packet with a huge gap range (`gapList .base - gapStart`), an attacker drives `StatefulReader::processGapMsg()` into an unbounded loop that inserts millions of s equence numbers into `WriterProxy::changes_received_` (`std::set`), causing multi-GB heap growth and process termination. No authentication is required beyond network reachability to the reader on the DDS domain. In environments without an RSS limit (non-ASan / unlimited), memory consumption was observed to rise to ~64 GB. Versions 3.4.1, 3.3.1, and 2.6.11 patch t he issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | fastdds | no fix listed | DEBIAN-CVE-2025-64438 |
| Debian:13 | fastdds | no fix listed | DEBIAN-CVE-2025-64438 |
| Ubuntu:24.04:LTS | fastdds | no fix listed | UBUNTU-CVE-2025-64438 |
| Ubuntu:25.10 | fastdds | no fix listed | UBUNTU-CVE-2025-64438 |
| Ubuntu:26.04:LTS | fastdds | no fix listed | UBUNTU-CVE-2025-64438 |
| Ubuntu:26.10 | fastdds | no fix listed | UBUNTU-CVE-2025-64438 |
Affected products (as reported)
Weakness: CWE-835 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
References
- https://security-tracker.debian.org/tracker/CVE-2025-64438
- https://github.com/eProsima/Fast-DDS/commit/0b0cb308eaeeb2175694aa0a0a723106824ce9a7
- https://github.com/eProsima/Fast-DDS/commit/71da01b4aea4d937558984f2cf0089f5ba3c871f
- https://github.com/eProsima/Fast-DDS/commit/8ca016134dac20b6e30e42b7b73466ef7cdbc213