CVE-2026-26955

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Prior to version 3.23.0, a malicious RDP server can trigger a heap buffer overflow in FreeRDP clients using the GDI surface pipeline (e.g., `xfreerdp`) by sending an RDPGFX ClearCodec surface command with an out-of-bounds destination rectangle. The `gdi_SurfaceCommand_ClearCodec()` handler does not call `is_within_surface()` to validate the command rectangle against the destination surface dimensions, allowing attacker-controlled `cmd->left`/`cmd->top` (and subcodec rectangle offsets) to reach image copy routines that write into `surface->data` without bounds enforcement. The OOB write corrupts an adjacent `gdiGfxSurface` struct's `codecs*` pointer with attacker-controlled pixel data, and corruption of `codecs*` is sufficient to reach an indirect function pointer call (`NSC_CONTEXT.decode` at `nsc.c:500`) on a subsequent codec command \u2014 full instruction pointer (RIP) control demonstrated in exploitability harness. Users should upgrade to version 3.23.0 to receive a patch."}], "source": {"advisory": "GHSA-mr6w-ch7c-mqqj", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-02-26T20:30:12.659110Z", "id": "CVE-2026-26955", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-02-26T20:30:46.008Z"}}, {"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"}, 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Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "2:2.4.1-3.el9_0.2", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:rhel_e4s:9.2"], "defaultStatus": "affected", "packageName": "freerdp", "product": "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "2:2.4.1-6.el9_2.4", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:rhel_eus:9.4"], "defaultStatus": "affected", "packageName": "freerdp", "product": "Red Hat Enterprise Linux 9.4 Extended Update Support", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "2:2.11.2-1.el9_4.3", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/a:redhat:rhel_eus:9.6"], "defaultStatus": "affected", "packageName": "freerdp", "product": "Red Hat Enterprise Linux 9.6 Extended Update Support", "vendor": "Red Hat", "versions": [{"lessThan": "*", "status": "unaffected", "version": "2:2.11.7-1.el9_6.5", "versionType": "rpm"}]}, {"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": ["cpe:/o:redhat:enterprise_linux:6"], "defaultStatus": "unaffected", "packageName": "freerdp", "product": "Red Hat Enterprise Linux 6", "vendor": "Red Hat"}], "datePublic": "2026-02-25T20:47:14.660Z", "descriptions": [{"lang": "en", "value": "A flaw was found in FreeRDP, a free implementation of the Remote Desktop Protocol (RDP). A malicious RDP server can exploit a heap buffer overflow vulnerability by sending a specially crafted graphics command to a FreeRDP client. This allows the server to write data outside of its intended memory region, potentially leading to arbitrary code execution on the client system. The vulnerability occurs because the client does not properly validate the dimensions of incoming graphics commands."}], "metrics": [{"other": {"content": {"namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"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"}, "format": "CVSS"}], "problemTypes": [{"descriptions": [{"cweId": "CWE-805", "description": "Buffer Access with Incorrect Length Value", "lang": "en", "type": "CWE"}]}], "references": [{"tags": ["vdb-entry", "x_refsource_REDHAT"], "url": "https://access.redhat.com/security/cve/CVE-2026-26955"}, {"name": "RHBZ#2443132", "tags": 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{"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:6665"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:6764"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:6395"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:6396"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:6384"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:6385"}, {"tags": ["vendor-advisory", "x_refsource_REDHAT"], "url": "https://access.redhat.com/errata/RHSA-2026:6004"}], "solutions": [{"lang": "en", "value": "RHSA-2026:7292: Red Hat Enterprise Linux Server (v. 7 ELS), Red Hat Enterprise Linux Server Optional (v. 7 ELS)"}, {"lang": "en", "value": "RHSA-2026:5936: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)"}, {"lang": "en", "value": "RHSA-2026:5939: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)"}, {"lang": "en", "value": "RHSA-2026:19033: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)"}, {"lang": "en", "value": "RHSA-2026:6005: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8)"}, {"lang": "en", "value": "RHSA-2026:6712: Red Hat Enterprise Linux AppStream AUS (v. 8.2)"}, {"lang": "en", "value": "RHSA-2026:6616: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4)"}, {"lang": "en", "value": "RHSA-2026:6665: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream E4S (v.8.6), Red Hat Enterprise Linux AppStream TUS (v.8.6)"}, {"lang": "en", "value": "RHSA-2026:6764: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8)"}, {"lang": "en", "value": "RHSA-2026:6395: Red Hat Enterprise Linux AppStream E4S (v.9.0)"}, {"lang": "en", "value": "RHSA-2026:6396: Red Hat Enterprise Linux AppStream E4S (v.9.2)"}, {"lang": "en", "value": "RHSA-2026:6384: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux AppStream EUS (v.9.4)"}, {"lang": "en", "value": "RHSA-2026:6385: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)"}, {"lang": "en", "value": "RHSA-2026:6004: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)"}], "timeline": [{"lang": "en", "time": "2026-02-26T21:03:46.682Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-02-25T20:47:14.660Z", "value": "Made public."}], "title": "freerdp: FreeRDP: Arbitrary code execution via heap buffer overflow in GDI surface pipeline", "workarounds": [{"lang": "en", "value": "To mitigate this issue, avoid connecting to untrusted or unverified RDP servers. Users should only establish RDP connections with known and trusted servers. If connecting to untrusted servers is unavoidable, consider using a sandbox environment or a dedicated, isolated system for such connections to limit potential impact."}], "x_adpType": "supplier", "x_generator": {"engine": "sadp-cli 1.0.0"}, "providerMetadata": {"orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-07-15T01:14:49.142Z"}}]}}

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"RHSA-2026:6764: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8)"}, {"lang": "en", "value": "RHSA-2026:6395: Red Hat Enterprise Linux AppStream E4S (v.9.0)"}, {"lang": "en", "value": "RHSA-2026:6396: Red Hat Enterprise Linux AppStream E4S (v.9.2)"}, {"lang": "en", "value": "RHSA-2026:6384: Red Hat CodeReady Linux Builder EUS (v.9.4), Red Hat Enterprise Linux AppStream EUS (v.9.4)"}, {"lang": "en", "value": "RHSA-2026:6385: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6)"}, {"lang": "en", "value": "RHSA-2026:6004: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)"}], "x_adpType": "supplier", "datePublic": "2026-02-25T20:47:14.660Z", "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-26955", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2443132", "name": "RHBZ#2443132", "tags": 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Users should upgrade to version 3.23.0 to receive a patch."}, {"lang": "es", "value": "FreeRDP es una implementaci\u00f3n gratuita del Protocolo de Escritorio Remoto. Antes de la versi\u00f3n 3.23.0, un servidor RDP malicioso puede desencadenar un desbordamiento de b\u00fafer de mont\u00f3n en clientes FreeRDP que utilizan la tuber\u00eda de superficie GDI (por ejemplo, 'xfreerdp') enviando un comando de superficie RDPGFX ClearCodec con un rect\u00e1ngulo de destino fuera de l\u00edmites. El gestor 'gdi_SurfaceCommand_ClearCodec()' no llama a 'is_within_surface()' para validar el rect\u00e1ngulo del comando contra las dimensiones de la superficie de destino, permitiendo que 'cmd-&gt;left'/'cmd-&gt;top' (y los desplazamientos del rect\u00e1ngulo del subc\u00f3dec) controlados por el atacante alcancen rutinas de copia de imagen que escriben en 'surface-&gt;data' sin aplicaci\u00f3n de l\u00edmites. La escritura OOB corrompe el puntero 'codecs*' de una estructura 'gdiGfxSurface' adyacente con datos de p\u00edxeles controlados por el atacante, y la corrupci\u00f3n de 'codecs*' es suficiente para alcanzar una llamada a puntero de funci\u00f3n indirecta ('NSC_CONTEXT.decode' en 'nsc.c:500') en un comando de c\u00f3dec subsiguiente \u2014 control total del puntero de instrucci\u00f3n (RIP) demostrado en el arn\u00e9s de explotabilidad. Los usuarios deben actualizar a la versi\u00f3n 3.23.0 para recibir un parche."}], "id": "CVE-2026-26955", "lastModified": "2026-07-15T02:19:02.203", "metrics": {"cvssMetricV31": [{"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"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "security-advisories@github.com", "type": "Secondary"}, {"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"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-26955", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-02-26T20:30:12.659110Z", "version": "2.0.3"}}]}, "published": "2026-02-25T21:16:42.863", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/FreeRDP/FreeRDP/commit/7d8fdce2d0ef337cb86cb37fc0c436c905e04d77"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Patch", "Vendor Advisory"], "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mr6w-ch7c-mqqj"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:19033"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:5936"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:5939"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:6004"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:6005"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:6384"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:6385"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:6395"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:6396"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:6616"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:6665"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:6712"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:6764"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/errata/RHSA-2026:7292"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-26955"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2443132"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26955.json"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-805"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "freerdp: FreeRDP: Arbitrary code execution via heap buffer overflow in GDI surface pipeline", "id": "2443132", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2443132"}, "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-805", "details": ["FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.23.0, a malicious RDP server can trigger a heap buffer overflow in FreeRDP clients using the GDI surface pipeline (e.g., `xfreerdp`) by sending an RDPGFX ClearCodec surface command with an out-of-bounds destination rectangle. The `gdi_SurfaceCommand_ClearCodec()` handler does not call `is_within_surface()` to validate the command rectangle against the destination surface dimensions, allowing attacker-controlled `cmd->left`/`cmd->top` (and subcodec rectangle offsets) to reach image copy routines that write into `surface->data` without bounds enforcement. The OOB write corrupts an adjacent `gdiGfxSurface` struct's `codecs*` pointer with attacker-controlled pixel data, and corruption of `codecs*` is sufficient to reach an indirect function pointer call (`NSC_CONTEXT.decode` at `nsc.c:500`) on a subsequent codec command \u2014 full instruction pointer (RIP) control demonstrated in exploitability harness. Users should upgrade to version 3.23.0 to receive a patch."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, avoid connecting to untrusted or unverified RDP servers. Users should only establish RDP connections with known and trusted servers. If connecting to untrusted servers is unavoidable, consider using a sandbox environment or a dedicated, isolated system for such connections to limit potential impact."}, "name": "CVE-2026-26955", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Under investigation", "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": "Under investigation", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Under investigation", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-25T20:47:14Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-26955\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-26955\nhttps://github.com/FreeRDP/FreeRDP/commit/7d8fdce2d0ef337cb86cb37fc0c436c905e04d77\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mr6w-ch7c-mqqj"], "statement": "A malicous RDP server may lead a heap buffer overflow in FreeRDP when the client is using the GDI surface pipeline. This happens when the server send a maliciously crafted RDPGFX ClearCodec command. When interpreting the command FreeRDP fails to validate the whether rectangle described by it falls within the destination surface dimension allowing the attacker to overwrite the surface data buffer without any boundaries check. Depending on the memory layout of the freerdp client's process it's possible to corrupt adjacent points leading to a remote code execution or force the freerdp client to crash.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.23.0)"}}], "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": "2026-04-17T14:51:42.212323+00:00", "value": {"mitigation_remediation": ["Upgrade all FreeRDP clients to version 3.23.0 or later to apply the bounds\u2011checking patch in gdi_SurfaceCommand_ClearCodec.", "Restrict RDP client connections to trusted servers only, and block unexpected RDPGFX ClearCodec packets that specify out\u2011of\u2011bounds rectangles via firewall or packet\u2011inspection rules.", "Upon patching, validate that the GDI surface pipeline is enabled only when required, or switch to an alternative rendering pipeline that does not process ClearCodec commands, to reduce the attack surface."], "summary": {"action": "Patch Immediately", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The affected product is FreeRDP, with all releases before version 3.23.0 vulnerable, including the xfreerdp client that utilizes the GDI surface pipeline. No other vendors or product variations are mentioned in the CVE.", "description_and_impact": "FreeRDP clients that use the GDI surface pipeline are vulnerable to a heap buffer overflow caused by an RDP server that sends an RDPGFX ClearCodec command with an out-of-bounds destination rectangle. The lack of bounds checking in the gdi_SurfaceCommand_ClearCodec handler allows the attacker to write beyond the intended surface data, corrupting a pointer inside the gdiGfxSurface structure. This corruption leads to an indirect function pointer call that an attacker can control, enabling full instruction pointer takeover and arbitrary code execution on the client.", "risk_and_exploitability": "The CVSS score of 8.8 indicates a high severity RCE. The EPSS score is less than 1%, suggesting low current exploitation probability, and the vulnerability is not listed in the CISA KEV catalog, implying no known active exploitation yet. However, the vulnerability can be triggered by any RDP server that a client connects to, meaning an attacker only needs to host a malicious RDP server or control an existing one. The demonstration of an exploit harness confirms that remote exploitation is practical, so the risk remains significant if the client connects to an untrusted server."}}}}, "created": "2026-02-26T13:14:33.127885+00:00", "updated": "2026-04-17T15:00:11.017996+00:00", "vendors": ["freerdp", "freerdp$PRODUCT$freerdp"]}