CVE-2026-121954

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{"bugzilla": {"description": "freerdp: freerdp: Denial of Service via heap out-of-bounds write in planar codec", "id": "2567613", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567613"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["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.", "A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can cause a Denial of Service (DoS) and heap memory corruption on the connecting client. This issue occurs in the planar graphics codec because new display dimensions are applied before memory buffer reallocation succeeds. When reallocation fails, the context is not rolled back, allowing subsequent planar drawing commands to write beyond the allocated buffer boundaries and crash the client."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-121954", "public_date": "2026-11-04T15:33:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121954\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121954\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fg78-v8j5-8697\nhttps://www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-out-of-bounds-write-in-planar-codec"], "statement": "Red Hat Product Security has rated this vulnerability as having a Moderate severity because successful exploitation requires user interaction to initiate a remote desktop session to an untrusted or compromised server, rather than targeting an exposed listening network service. While processing manipulated graphics display commands can lead to client-side memory corruption, the demonstrated impact is confined to terminating the client session via a crash. Server deployments of FreeRDP and sessions established solely with trusted remote hosts do not face exposure from arbitrary remote attackers.", "threat_severity": "Moderate"}

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