# CVE-2026-121406: FreeRDP before 3.32.2 Client Denial of Service via Zero-Output ZGFX Payload

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

FreeRDP before 3.32.2 allows a client assertion abort because rdpgfx_on_data_received rejects only negative zgfx_decompress status and passes the resulting null output pointer to Stream_StaticConstInit. A malicious RDP server can send a zero-output ZGFX payload on the RDPGFX channel after session activation to terminate the client.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- FreeRDP / FreeRDP: ≥ 0; < 3.32.2 (affected, semver); 3.32.2 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 4.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-617

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2c9x-4gr7-hrwx (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/freerdp-before-3.32.2-client-denial-of-service-via-zero-output-zgfx-payload (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121406; retrieved 2026-11-03; source updated 2026-11-03

Revision: 223c7eacace7fb35ef989f6909996cb3a8331ab25aed0dfc1a8afc2c9fccb6ef

Canonical: https://y2.dev/cve/CVE-2026-121406

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