# CVE-2026-121954: FreeRDP before 3.32.2 Heap Out-of-Bounds Write in Planar Codec

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

FreeRDP before 3.32.2 has a heap out-of-bounds write in the planar codec because freerdp_bitmap_planar_context_reset commits new dimensions before buffer reallocation succeeds, and a failed ResetGraphics is only logged. A malicious RDP server can send an oversized ResetGraphics PDU, then a GFX PLANAR command, to corrupt client heap memory and crash 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: 7.1 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N; source: CNA: VulnCheck

- CVSS 4.0: 7.1 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-787

## Exploit evidence

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

## References

- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fg78-v8j5-8697 (CNA: VulnCheck; vendor-advisory)

- https://www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-out-of-bounds-write-in-planar-codec (CNA: VulnCheck; third-party-advisory)

- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fg78-v8j5-8697 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-out-of-bounds-write-in-planar-codec (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121954; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-121954; retrieved 2026-11-04; source updated 2026-11-04

Revision: ff9861770248ef329ad74a378a08905a063ab9caecb0a5dd68597982059f19ee

Canonical: https://y2.dev/cve/CVE-2026-121954

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