CVE-2026-56297

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-56297", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-06-20T12:49:17.829Z", "datePublished": "2026-07-08T13:49:01.343Z", "dateUpdated": "2026-07-08T14:23:00.749Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-07-08T13:49:01.343Z"}, "datePublic": "2026-05-04T00:00:00.000Z", "title": "FreeRDP - Use-After-Free via Race Condition in DRDYNVC Channel Callback", "descriptions": [{"lang": "en", "value": "FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcman_channel_close and dvcman_call_on_receive due to improper synchronization of channel_callback access. A malicious RDP server can trigger a race condition by sending DYNVC_DATA and DYNVC_CLOSE messages concurrently, causing heap-use-after-free in the drdynvc client thread and potentially enabling remote code execution or denial of service."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')", "cweId": "CWE-362", "type": "CWE"}]}], "affected": [{"vendor": "FreeRDP", "product": "FreeRDP", "defaultStatus": "unaffected", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThan": "3.22.0"}, {"version": "3.22.0", "status": "unaffected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.22.0"}]}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 8.3, "baseSeverity": "HIGH", "exploitMaturity": "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:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS"}, {"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H", "version": "3.1"}, "format": "CVSS"}], "references": [{"url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h", "name": "GitHub Security Advisory (GHSA-3mv2-5q57-2v8h)", "tags": ["vendor-advisory"]}, {"name": "VulnCheck Advisory: FreeRDP - Use-After-Free via Race Condition in DRDYNVC Channel Callback", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/freerdp-use-after-free-via-race-condition-in-drdynvc-channel-callback"}], "credits": [{"lang": "en", "value": "jeremylaratro", "type": "reporter"}], "x_generator": {"engine": "vulncheck-endgame"}}, "adp": [{"references": [{"url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-08T14:22:55.790096Z", "id": "CVE-2026-56297", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-08T14:23:00.749Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-56297", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-08T14:22:55.790096Z"}}}], "references": [{"url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-08T14:22:51.069Z"}}], "cna": {"title": "FreeRDP - Use-After-Free via Race Condition in DRDYNVC Channel Callback", "credits": [{"lang": "en", "type": "reporter", "value": "jeremylaratro"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 8.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "HIGH", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}}, {"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}], "affected": [{"vendor": "FreeRDP", "product": "FreeRDP", "versions": [{"status": "affected", "version": "0", "lessThan": "3.22.0", "versionType": "semver"}, {"status": "unaffected", "version": "3.22.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "datePublic": "2026-05-04T00:00:00.000Z", "references": [{"url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h", "name": "GitHub Security Advisory (GHSA-3mv2-5q57-2v8h)", "tags": ["vendor-advisory"]}, {"url": "https://www.vulncheck.com/advisories/freerdp-use-after-free-via-race-condition-in-drdynvc-channel-callback", "name": "VulnCheck Advisory: FreeRDP - Use-After-Free via Race Condition in DRDYNVC Channel Callback", "tags": ["third-party-advisory"]}], "x_generator": {"engine": "vulncheck-endgame"}, "descriptions": [{"lang": "en", "value": "FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcman_channel_close and dvcman_call_on_receive due to improper synchronization of channel_callback access. A malicious RDP server can trigger a race condition by sending DYNVC_DATA and DYNVC_CLOSE messages concurrently, causing heap-use-after-free in the drdynvc client thread and potentially enabling remote code execution or denial of service."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-362", "description": "Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "3.22.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-07-08T13:49:01.343Z"}}}, "cveMetadata": {"cveId": "CVE-2026-56297", "state": "PUBLISHED", "dateUpdated": "2026-07-08T14:23:00.749Z", "dateReserved": "2026-06-20T12:49:17.829Z", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "datePublished": "2026-07-08T13:49:01.343Z", "assignerShortName": "VulnCheck"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "FreeRDP", "vendor": "FreeRDP", "versions": [{"lessThan": "3.22.0", "status": "affected", "version": "0", "versionType": "semver"}, {"status": "unaffected", "version": "3.22.0", "versionType": "semver"}]}], "source": "disclosure@vulncheck.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*", "matchCriteriaId": "9E363251-2275-4F89-B397-67FE461B63A0", "versionEndExcluding": "3.22.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcman_channel_close and dvcman_call_on_receive due to improper synchronization of channel_callback access. A malicious RDP server can trigger a race condition by sending DYNVC_DATA and DYNVC_CLOSE messages concurrently, causing heap-use-after-free in the drdynvc client thread and potentially enabling remote code execution or denial of service."}, {"lang": "es", "value": "FreeRDP anterior a la versi\u00f3n 3.22.0 contiene una vulnerabilidad de uso despu\u00e9s de liberaci\u00f3n en dvcman_channel_close y dvcman_call_on_receive debido a una sincronizaci\u00f3n inadecuada del acceso a channel_callback. Un servidor RDP malicioso puede desencadenar una condici\u00f3n de carrera al enviar mensajes DYNVC_DATA y DYNVC_CLOSE concurrentemente, causando un uso despu\u00e9s de liberaci\u00f3n en el heap en el hilo del cliente drdynvc y potencialmente permitiendo la ejecuci\u00f3n remota de c\u00f3digo o la denegaci\u00f3n de servicio."}], "id": "CVE-2026-56297", "lastModified": "2026-10-25T20:10:00.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.0, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.7, "source": "disclosure@vulncheck.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.3, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "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:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/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": "HIGH", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-56297", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-08T14:22:55.790096Z", "version": "2.0.3"}}]}, "published": "2026-07-08T14:17:16.360", "references": [{"source": "disclosure@vulncheck.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h"}, {"source": "disclosure@vulncheck.com", "tags": ["Third Party Advisory"], "url": "https://www.vulncheck.com/advisories/freerdp-use-after-free-via-race-condition-in-drdynvc-channel-callback"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{"bugzilla": {"description": "FreeRDP: FreeRDP: Remote code execution or denial of service via use-after-free race condition", "id": "2498073", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498073"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.6", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L", "status": "draft"}, "cwe": "CWE-364", "details": ["FreeRDP before 3.22.0 contains a use-after-free vulnerability in dvcman_channel_close and dvcman_call_on_receive due to improper synchronization of channel_callback access. A malicious RDP server can trigger a race condition by sending DYNVC_DATA and DYNVC_CLOSE messages concurrently, causing heap-use-after-free in the drdynvc client thread and potentially enabling remote code execution or denial of service.", "A flaw was found in FreeRDP. A malicious Remote Desktop Protocol (RDP) server can exploit a use-after-free vulnerability due to improper synchronization of channel callback access. By sending DYNVC_DATA and DYNVC_CLOSE messages concurrently, a race condition can be triggered in the drdynvc client thread, leading to heap-use-after-free. This could potentially enable remote code execution or cause a denial of service."], "mitigation": {"lang": "en:us", "value": "Configure host-based firewalls (e.g., firewalld) or network egress filtering so that the workstation can only initiate outbound RDP connections (typically TCP 3389) to known, trusted internal RDP gateways or corporate servers. Blocking outbound RDP to the wider internet neutralizes the threat of users accidentally connecting to malicious external endpoints."}, "name": "CVE-2026-56297", "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": "2026-07-08T13:49:01Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-56297\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-56297\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3mv2-5q57-2v8h\nhttps://www.vulncheck.com/advisories/freerdp-use-after-free-via-race-condition-in-drdynvc-channel-callback"], "statement": "This Moderate impact flaw in FreeRDP allows a malicious RDP server to trigger a use-after-free condition on the client by exploiting a race condition during dynamic virtual channel closure. This could lead to remote code execution or denial of service on the client system when connecting to a compromised or untrusted RDP server.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,3.22.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "3.22.0"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "FreeRDP", "source": "cna", "vendor": "FreeRDP"}, "product": "freerdp", "vendor": "freerdp"}], "created": "2026-07-08T15:45:03.294513+00:00", "updated": "2026-08-01T16:30:04.586752+00:00", "vendors": ["freerdp", "freerdp$PRODUCT$freerdp"]}