CVE-2026-121962

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{"bugzilla": {"description": "freerdp: freerdp: Denial of Service via heap buffer overflow during Early User Authorization", "id": "2567559", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567559"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["FreeRDP before 3.32.2 contains a heap buffer overflow in transport_default_read_pdu when handling partial Early User Authorization reads during PROTOCOL_HYBRID_EX CredSSP. A malicious RDP server can split the four-byte EUA result into short reads that advance the stream pointer beyond the 16 KiB allocation, causing an out-of-bounds write and client denial of service.", "A flaw was found in FreeRDP. This vulnerability allows a malicious Remote Desktop Protocol (RDP) server to cause a Denial of Service (DoS) or memory corruption by sending fragmented responses during Early User Authorization (EUA) authentication. Because FreeRDP fails to properly track remaining buffer space across partial network reads, incoming data advances past the allocated memory boundaries. An attacker who successfully exploits this issue triggers an out-of-bounds memory write, crashing the client application."], "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-2026-121962", "public_date": "2026-11-04T15:33:25Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121962\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121962\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j536-qc58-pmf8\nhttps://www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-buffer-overflow-via-early-user-authorization-read"], "statement": "Red Hat rates this vulnerability as Important because an attacker-controlled remote desktop server can trigger heap memory corruption or terminate the client process upon connection, presenting a high risk to client integrity and availability rather than a lower-severity transient failure. Successful exploitation requires user interaction to initiate a session to an untrusted or compromised endpoint capable of completing CredSSP negotiation. In Red Hat enterprise environments, FreeRDP primarily functions as an interactive client utility or backend for desktop graphical applications, which limits the blast radius strictly to the invoking user's local execution environment.", "threat_severity": "Important"}

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