CVE-2026-121956

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{"bugzilla": {"description": "freerdp: freerdp: Denial of Service via crafted Kerberos authentication request", "id": "2567939", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2567939"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1341", "details": ["FreeRDP before 3.32.2 contains a double free in the WinPR Kerberos SSPI retrieveSomeTgt function, which installs the krb5 default realm into a target principal that has an empty realm without taking ownership of it. Unauthenticated remote clients can send a crafted NLA/CredSSP u2u TGT request whose server-name component contains '@' to corrupt the heap and crash the server process.", "A flaw was found in FreeRDP. A double-free memory vulnerability in the Kerberos authentication component allows an unauthenticated remote attacker to cause a Denial of Service (DoS). By sending a specially crafted Network Level Authentication (NLA) request, an attacker can corrupt server memory and cause the application process to crash."], "mitigation": {"lang": "en:us", "value": "Restrict network exposure by limiting incoming connections to trusted IP addresses or networks using `firewalld`, or disable the listening RDP service if remote desktop access is not required.\nTo restrict RDP access to a trusted subnet using `firewalld`:\n```\nfirewall-cmd --permanent --remove-service=rdp\nfirewall-cmd --permanent --zone=trusted --add-source=<trusted_ip_or_subnet>\nfirewall-cmd --reload\n```\nWarning: Reloading firewall rules may temporarily interrupt existing network sessions and will prevent incoming RDP connections originating from outside the designated trusted subnets."}, "name": "CVE-2026-121956", "package_state": [{"cpe": "cpe:/a:redhat:enterprise_linux:10", "fix_state": "Under investigation", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:rhel_els:6", "fix_state": "Under investigation", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:rhel_els:7", "fix_state": "Under investigation", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_linux:8", "fix_state": "Under investigation", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-11-04T15:33:20Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-121956\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-121956\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-2557-79qc-6gfr\nhttps://www.vulncheck.com/advisories/freerdp-before-3.32.2-double-free-in-winpr-kerberos-retrievesometgt"], "statement": "This vulnerability is evaluated with an Important severity rating because an unauthenticated remote attacker can trigger a denial of service or heap corruption across the network before establishing credentials. In Red Hat enterprise environments, FreeRDP packages are primarily utilized as client-side software rather than listening services, which significantly reduces the exposed attack surface on typical installations. Exploitation specifically requires an active FreeRDP server or proxy configured with Kerberos authentication, an associated keytab, and an enabled user-to-user negotiation mechanism, limiting the likelihood of widespread exposure.", "threat_severity": "Important"}

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