CVE-2026-23732

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{"affected": [{"affectedData": [{"product": "FreeRDP", "vendor": "FreeRDP", "versions": [{"status": "affected", "version": "< 3.21.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*", "matchCriteriaId": "E6899265-905F-4A3A-96D3-07B552FBFBEC", "versionEndExcluding": "3.21.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to version 3.21.0, FastGlyph parsing trusts `cbData`/remaining length and never validates against the minimum size implied by `cx/cy`. A malicious server can trigger a client\u2011side global buffer overflow, causing a crash (DoS). Version 3.21.0 contains a patch for the issue."}, {"lang": "es", "value": "FreeRDP es una implementaci\u00f3n gratuita del Protocolo de Escritorio Remoto. Antes de la versi\u00f3n 3.21.0, el an\u00e1lisis de FastGlyph conf\u00eda en 'cbData'/la longitud restante y nunca valida contra el tama\u00f1o m\u00ednimo impl\u00edcito por 'cx/cy'. Un servidor malicioso puede desencadenar un desbordamiento de b\u00fafer global del lado del cliente, causando un fallo (DoS). La versi\u00f3n 3.21.0 contiene un parche para el problema."}], "id": "CVE-2026-23732", "lastModified": "2026-06-17T10:22:00.810", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23732", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-20T15:34:18.167748Z", "version": "2.0.3"}}]}, "published": "2026-01-19T18:16:05.867", "references": [{"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/cache/glyph.c#L463-L480"}, {"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/codec/color.c#L261-L277"}, {"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/graphics.c#L138"}, {"source": "security-advisories@github.com", "tags": ["Product"], "url": "https://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/orders.c#L2186C17-L2199"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7qxp-j2fj-c3pp"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7qxp-j2fj-c3pp"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "freerdp: FreeRDP: Denial of Service via FastGlyph parsing buffer overflow", "id": "2430881", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2430881"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-122", "details": ["A flaw was found in FreeRDP. A malicious server can exploit a vulnerability in FastGlyph parsing, which improperly trusts data length without sufficient validation. This can lead to a client-side global buffer overflow, resulting in a denial of service (DoS) due to a crash. For this vulnerability to be exploited, a client must connect to a maliciously-configured server."], "name": "CVE-2026-23732", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "freerdp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-01-19T17:12:57Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23732\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23732\nhttps://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/cache/glyph.c#L463-L480\nhttps://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/codec/color.c#L261-L277\nhttps://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/graphics.c#L138\nhttps://github.com/FreeRDP/FreeRDP/blob/f96ee2a6dd02739325c2a4e36a14978b561f00ea/libfreerdp/core/orders.c#L2186C17-L2199\nhttps://github.com/FreeRDP/FreeRDP/releases/tag/3.21.0\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-7qxp-j2fj-c3pp"], "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": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-18T05:09:06.570590+00:00", "value": {"mitigation_remediation": ["Upgrade to FreeRDP 3.21.0 or newer, where the FastGlyph buffer overflow bug is fixed.", "If an upgrade is not yet possible, disable the FastGlyph feature or restrict connections to trusted RDP servers to mitigate the risk of receiving malicious glyph payloads.", "Monitor client logs for repeated \u201cFreeRDP crash\u201d or memory errors, and ensure that crash recovery services restart the client to maintain service availability."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service (client crash)"}, "threat_synthesis": {"affected_systems": "FreeRDP version 3.20.x and earlier are vulnerable. The issue is present in the main FreeRDP library used by many open\u2011source remote\u2011desktop clients. Version 3.21.0 and later contain the patch. Any system running a FreeRDP client that connects to an attacker\u2011controlled RDP server and accepts FastGlyph packets is affected.", "description_and_impact": "The vulnerability resides in the parsing of FastGlyph data on the FreeRDP client. The code uses the cbData length without confirming that the minimum size implied by the glyph dimensions is satisfied. An attacker controlling a remote RDP server can send a malformed glyph packet that overflows a client\u2011side heap buffer. The result is a client crash, which is a denial\u2011of\u2011service condition. The weakness is a classic heap buffer overflow (CWE\u2011122).", "risk_and_exploitability": "The entry carries a CVSS score of 5.5, indicating moderate severity. Because the EPSS score is below 1%, the likelihood of this vulnerability being exploited in the wild is low, and it is not listed in the CISA KEV catalog. The attack requires the client to accept a malicious glyph packet from a remote server, which usually means the user must initiate a remote desktop session. The overflow leads only to a crash, not arbitrary code execution, making it a local or network\u2011limited denial of service."}}}}, "created": "2026-01-20T08:40:58.785752+00:00", "updated": "2026-04-18T05:15:15.980020+00:00", "vendors": ["freerdp", "freerdp$PRODUCT$freerdp"]}