CVE-2026-91945

FreeRDP versions before 3.31.0 contain an out-of-bounds read vulnerability in smartcard response decoders that fail to validate ATR length fields against fixed inline arrays. Authenticated RDP clients can send oversized ATR lengths in PAKID_CORE_DEVICE_IOCOMPLETION responses to trigger reads past stack or heap objects, causing process termination.

CVSS v3 6.5 MEDIUM

6.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/FreeRDP/FreeRDP/commit/9626564421df72c84f891afdbc0b20bf702f369f	Patch
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r	Exploit Mitigation Patch Vendor Advisory
https://www.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-read-via-smartcard-atr	Third Party Advisory
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r	Exploit Mitigation Patch Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*

History

24 Sep 2026, 12:13

Type	Values Removed	Values Added
References	~~() https://github.com/FreeRDP/FreeRDP/commit/9626564421df72c84f891afdbc0b20bf702f369f -~~	() https://github.com/FreeRDP/FreeRDP/commit/9626564421df72c84f891afdbc0b20bf702f369f - Patch
References	~~() https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r -~~	() https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r - Exploit, Mitigation, Patch, Vendor Advisory
References	~~() https://www.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-read-via-smartcard-atr -~~	() https://www.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-read-via-smartcard-atr - Third Party Advisory
First Time		Freerdp freerdp Freerdp
CPE		cpe:2.3:a:freerdp:freerdp::::::::

Information

Published : 2026-09-15 16:17

Updated : 2026-09-24 12:13

NVD link : CVE-2026-91945

Mitre link : CVE-2026-91945

CVE.ORG link : CVE-2026-91945

JSON object : View

Products Affected

freerdp

freerdp

CWE

CWE-125

Out-of-bounds Read

{"id": "CVE-2026-91945", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-91945", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-15T15:51:49.870990Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "disclosure@vulncheck.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "disclosure@vulncheck.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.1, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "disclosure@vulncheck.com", "affectedData": [{"vendor": "FreeRDP", "product": "FreeRDP", "versions": [{"status": "affected", "version": "3.28.0", "lessThan": "3.31.0", "versionType": "semver"}, {"status": "unaffected", "version": "3.31.0", "versionType": "semver"}], "defaultStatus": "unaffected"}]}], "published": "2026-09-15T16:17:46.657", "references": [{"url": "https://github.com/FreeRDP/FreeRDP/commit/9626564421df72c84f891afdbc0b20bf702f369f", "tags": ["Patch"], "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r", "tags": ["Exploit", "Mitigation", "Patch", "Vendor Advisory"], "source": "disclosure@vulncheck.com"}, {"url": "https://www.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-read-via-smartcard-atr", "tags": ["Third Party Advisory"], "source": "disclosure@vulncheck.com"}, {"url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r", "tags": ["Exploit", "Mitigation", "Patch", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "disclosure@vulncheck.com", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "FreeRDP versions before 3.31.0 contain an out-of-bounds read vulnerability in smartcard response decoders that fail to validate ATR length fields against fixed inline arrays. Authenticated RDP clients can send oversized ATR lengths in PAKID_CORE_DEVICE_IOCOMPLETION responses to trigger reads past stack or heap objects, causing process termination."}], "lastModified": "2026-09-24T12:13:45.970", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "ACE4FD8E-25C3-4B89-8FF4-5EEDDD31DB87", "versionEndExcluding": "3.31.0", "versionStartIncluding": "3.28.0"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}