CVE-2026-91963

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{"bugzilla": {"description": "FreeRDP: FreeRDP: Remote code execution via uninitialized heap memory disclosure", "id": "2533930", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2533930"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-824", "details": ["A flaw was found in FreeRDP. An uninitialized heap memory disclosure vulnerability exists in the urbdrc USB redirection channel. A malicious Remote Desktop Protocol (RDP) server can exploit this by inducing failing USB transfers, allowing it to read uninitialized heap memory from the client. This information disclosure can defeat Address Space Layout Randomization (ASLR), potentially enabling remote code execution when chained with other memory corruption vulnerabilities."], "mitigation": {"lang": "en:us", "value": "To reduce exposure, avoid connecting to untrusted RDP servers or disable the FreeRDP USB redirection channel if it is not required. When using the `xfreerdp` client, ensure that USB redirection is not enabled. This can be done by omitting the `/usb` or `/usb-redir` command-line options, or by explicitly disabling the `urbdrc` channel through FreeRDP configuration if available. Disabling this feature will prevent the redirection of USB devices to the remote session."}, "name": "CVE-2026-91963", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-09-15T15:18:16Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-91963\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-91963\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-hw7p-5h2r-83gq\nhttps://www.vulncheck.com/advisories/freerdp-2.0.0-through-3.30.0-uninitialized-heap-memory-disclosure-via-urbdrc"], "threat_severity": "Important"}

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