CVE-2026-23884

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A malicious server can exploit this vulnerability when a client connects to it. Specifically, offscreen bitmap deletion can lead to a use-after-free (UAF) condition, where the client attempts to use memory that has already been deallocated. 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{"bugzilla": {"description": "freerdp: FreeRDP: Denial of Service and potential code execution via use-after-free vulnerability", "id": "2430880", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2430880"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol. A malicious server can exploit this vulnerability when a client connects to it. Specifically, offscreen bitmap deletion can lead to a use-after-free (UAF) condition, where the client attempts to use memory that has already been deallocated. This can cause a crash, resulting in a Denial of Service (DoS), and potentially lead to heap corruption with a risk of arbitrary code execution."], "name": "CVE-2026-23884", "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": "Affected", "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": "2026-01-19T17:20:40Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23884\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23884\nhttps://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/libfreerdp/cache/offscreen.c#L114-L122\nhttps://github.com/FreeRDP/FreeRDP/blob/3370e30e92a021eb680892dda14d642bc8b8727c/libfreerdp/cache/offscreen.c#L87-L91\nhttps://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cfgj-vc84-f3pp"], "statement": "For this vulnerability to be exploited, a client must connect to a maliciously-configured server. Red Hat recommends that FreeRDP clients are only used to connect to trusted servers.", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-18T05:08:17.916978+00:00", "value": {"mitigation_remediation": ["Upgrade to FreeRDP 3.21.0 or newer.", "If upgrade is delayed, disable offscreen bitmap caching in the client configuration to avoid the freed pointer usage.", "Monitor RDP sessions for abnormal crashes and verify the latest client version is in use."], "summary": {"action": "Immediate patch", "impact": "Potential Denial of Service with code execution risk"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the FreeRDP project on all installations built with versions earlier than 3.21.0. Users running 3.21.0 or later are not impacted because the patch was applied in that release.", "description_and_impact": "FreeRDP clients prior to version 3.21.0 contain a heap\u2011use\u2011after\u2011free flaw in the offscreen bitmap deletion routine. When a client receives an update packet after a bitmap has been freed, the library continues to reference the stale pointer, causing a crash. Depending on the libc allocator behavior and surrounding heap layout, this scenario could drive heap corruption and lead to arbitrary code execution on the client system.", "risk_and_exploitability": "The flaw receives a CVSS base score of 7.7 and an EPSS value below 1\u202f% at the time of analysis, indicating a low likelihood of widespread exploitation. It is not listed in the CISA KEV catalog. The attack surface requires a malicious RDP server to send specially crafted update packets after an offscreen bitmap has been freed; this condition is inferred from the description. Due to the far\u2011thest reachable remote code execution risk, timely remediation is advised."}}}}, "created": "2026-01-20T08:40:56.628559+00:00", "updated": "2026-04-18T05:15:15.978760+00:00", "vendors": ["freerdp", "freerdp$PRODUCT$freerdp"]}