CVE-2026-121957

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{"bugzilla": {"description": "freerdp: freerdp: Memory corruption via race condition in planar bitmap decoding", "id": "2567521", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567521"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["FreeRDP before 3.32.2 contains a use-after-free vulnerability that allows malicious RDP servers to corrupt client memory by racing the RDPGFX ResetGraphics handler against the planar bitmap decoder. Attackers can send ResetGraphics while concurrently sending compressed bitmaps of 32 bpp or more to trigger heap use-after-free or out-of-bounds read/write on shared planar buffers.", "A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can trigger a race condition in the client by concurrently transmitting graphics reset commands alongside compressed bitmap data. This flaw leads to a use-after-free condition or out-of-bounds memory access on shared graphics decoding buffers. Consequently, an attacker can corrupt client memory, potentially causing the client application to crash resulting in a Denial of Service (DoS) or exposing sensitive memory contents."], "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-2026-121957", "public_date": "2026-11-04T15:33:21Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121957\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121957\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-xjhw-2r55-m95g\nhttps://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-rdpgfx-resetgraphics-race"], "statement": "This flaw is rated as an Important severity because an untrusted endpoint can compromise client memory integrity and potentially execute arbitrary code with the privileges of the user running the session. A client system is vulnerable only when initiating a connection to an attacker-controlled remote desktop server that transmits conflicting display pipeline instructions. Although triggering this synchronization defect requires specific timing and client-initiated interaction, successful exploitation directly compromises the security boundaries of the client system.", "threat_severity": "Important"}

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