CVE-2026-31806

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This vulnerability is fixed in 3.24.0."}], "source": {"advisory": "GHSA-rrqm-46rj-cmx2", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-31806", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-03-14T03:55:34.087938Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-15T01:51:18.600Z"}}, {"affected": [{"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:10.1", "cpe:/o:redhat:enterprise_linux:10.2"], "defaultStatus": "affected", "packageName": "freerdp", "product": "Red Hat Enterprise Linux 10", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "2:3.10.3-12.el10_2.2", "versionType": "rpm"}, {"lessThan": "*", 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The `gdi_surface_bits()` function, which processes `SURFACE_BITS_COMMAND` messages, does not properly validate image dimensions (`bmp.width` and `bmp.height`) provided by a malicious RDP server. This can lead to a heap buffer overflow during bitmap decoding and memory operations. 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Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 3.24.0."}], "id": "CVE-2026-31806", "lastModified": "2026-07-15T02:19:50.480", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, 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"2026-03-13T19:54:36.300", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/FreeRDP/FreeRDP/commit/83d9aedea278a74af3e490ff5eeb889c016dbb2b"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Patch", "Vendor Advisory"], "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrqm-46rj-cmx2"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:10076"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:10734"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:10735"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:10951"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:11323"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": 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{"bugzilla": {"description": "freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages", "id": "2447376", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2447376"}, "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-131", "details": ["A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol (RDP). The `gdi_surface_bits()` function, which processes `SURFACE_BITS_COMMAND` messages, does not properly validate image dimensions (`bmp.width` and `bmp.height`) provided by a malicious RDP server. This can lead to a heap buffer overflow during bitmap decoding and memory operations. A remote attacker could exploit this to overwrite adjacent memory, potentially resulting in arbitrary code execution."], "name": "CVE-2026-31806", "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": "2026-03-13T17:40:19Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31806\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31806\nhttps://github.com/FreeRDP/FreeRDP/commit/83d9aedea278a74af3e490ff5eeb889c016dbb2b\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-rrqm-46rj-cmx2"], "statement": "For this vulnerability to be exploited, a susceptible system must connect to a malicious server. For that reason, Red Hat recommends that you only use FreeRDP to connect to trusted servers.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.24.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "FreeRDP", "source": "cna", "vendor": "FreeRDP"}, "product": "freerdp", "vendor": "freerdp"}], "analysis": {"en": {"generated_at": "2026-03-17T16:55:26.333182+00:00", "value": {"mitigation_remediation": ["Apply the FreeRDP patch to version 3.24.0 or newer.", "If the patch cannot be applied immediately, limit RDP connections to trusted IP ranges or enforce VPN access to restrict who can serve RDP commands.", "Monitor system logs for abnormal SURFACE_BITS_COMMAND entries and consider disabling support for NSCodec-generated bitmap messages if not required."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The issue affects the FreeRDP implementation of the Remote Desktop Protocol up to version 3.23.x and earlier. Any deployment of FreeRDP that processes SURFACE_BITS_COMMAND messages via NSCodec without the 3.24.0 update is vulnerable. The vendor explicitly lists FreeRDP:FreeRDP as the impacted product.", "description_and_impact": "A heap buffer overflow occurs in the FreeRDP\u2019s nsc_process_message() function when it processes SURFACE_BITS_COMMAND messages. As described, the function gdi_surface_bits() is unable to validate the bitmap width and height values supplied by the RDP server, allowing those values to exceed the actual desktop surface dimensions. The unchecked values are used during bitmap decoding and memory operations, resulting in an uncontrolled overflow that can overwrite adjacent heap memory. This vulnerability could enable an attacker to execute arbitrary code or crash the client. Key detail from vendor description: *\"This vulnerability is fixed in 3.24.0.\"*", "risk_and_exploitability": "The CVSS score of 9.3 indicates a critical severity, and the EPSS score of less than 1% suggests a low probability of exploitation at present. Though the vulnerability is not listed in the CISA KEV catalog, its nature allows an attacker who controls a malicious RDP server to send crafted bitmap commands over the network, thereby exploiting the unchecked dimensions. Based on the description, it is inferred that the attack vector is remote network traffic. The potential impact includes arbitrary code execution on the affected client system."}}}}, "created": "2026-03-16T09:24:47.825975+00:00", "updated": "2026-03-23T13:40:39.069731+00:00", "vendors": ["freerdp", "freerdp$PRODUCT$freerdp"]}