{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31883", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-09T21:59:02.686Z", "datePublished": "2026-03-13T17:35:17.411Z", "dateUpdated": "2026-03-16T17:02:52.737Z"}, "containers": {"cna": {"title": "FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write", "problemTypes": [{"descriptions": [{"cweId": "CWE-191", "lang": "en", "description": "CWE-191: Integer Underflow (Wrap or Wraparound)", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-122", "lang": "en", "description": "CWE-122: Heap-based Buffer Overflow", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-85x9-4xxp-xhm5", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-85x9-4xxp-xhm5"}, {"name": "https://github.com/FreeRDP/FreeRDP/commit/16df2300e1e3f5a51f68fb1626429e58b531b7c8", "tags": ["x_refsource_MISC"], "url": "https://github.com/FreeRDP/FreeRDP/commit/16df2300e1e3f5a51f68fb1626429e58b531b7c8"}], "affected": [{"vendor": "FreeRDP", "product": "FreeRDP", "versions": [{"version": "< 3.24.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-13T17:35:17.411Z"}, "descriptions": [{"lang": "en", "value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, a size_t underflow in the IMA-ADPCM and MS-ADPCM audio decoders leads to heap-buffer-overflow write via the RDPSND audio channel. In libfreerdp/codec/dsp.c, the IMA-ADPCM and MS-ADPCM decoders subtract block header sizes from a size_t variable without checking for underflow. When nBlockAlign (received from the server) is set such that size % block_size == 0 triggers the header parsing at a point where size is smaller than the header (4 or 8 bytes), the subtraction wraps size to ~SIZE_MAX. The while (size > 0) loop then continues for an astronomical number of iterations. This vulnerability is fixed in 3.24.0."}], "source": {"advisory": "GHSA-85x9-4xxp-xhm5", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-85x9-4xxp-xhm5", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-16T17:02:49.465233Z", "id": "CVE-2026-31883", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"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": "2026-03-16T17:02:52.737Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*", "matchCriteriaId": "97FCA262-35C3-4B6B-A321-15CE780FCA20", "versionEndExcluding": "3.24.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, a size_t underflow in the IMA-ADPCM and MS-ADPCM audio decoders leads to heap-buffer-overflow write via the RDPSND audio channel. In libfreerdp/codec/dsp.c, the IMA-ADPCM and MS-ADPCM decoders subtract block header sizes from a size_t variable without checking for underflow. When nBlockAlign (received from the server) is set such that size % block_size == 0 triggers the header parsing at a point where size is smaller than the header (4 or 8 bytes), the subtraction wraps size to ~SIZE_MAX. The while (size > 0) loop then continues for an astronomical number of iterations. This vulnerability is fixed in 3.24.0."}], "id": "CVE-2026-31883", "lastModified": "2026-03-17T14:26:13.760", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}, {"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"}]}, "published": "2026-03-13T19:54:37.190", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/FreeRDP/FreeRDP/commit/16df2300e1e3f5a51f68fb1626429e58b531b7c8"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Patch", "Vendor Advisory"], "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-85x9-4xxp-xhm5"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Patch", "Vendor Advisory"], "url": "https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-85x9-4xxp-xhm5"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}, {"lang": "en", "value": "CWE-191"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "freerdp: FreeRDP has a `size_t` underflow in ADPCM decoder leads to heap-buffer-overflow write", "id": "2447386", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2447386"}, "csaw": false, "details": ["No description is available for this CVE."], "name": "CVE-2026-31883", "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": "2026-03-13T17:35:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31883\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31883\nhttps://github.com/FreeRDP/FreeRDP/commit/16df2300e1e3f5a51f68fb1626429e58b531b7c8\nhttps://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-85x9-4xxp-xhm5"], "threat_severity": "Moderate"}

{"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": "2026-03-17T16:56:11.290144+00:00", "value": {"mitigation_remediation": ["Apply FreeRDP version 3.24.0 or later to eliminate the underflow.", "If an immediate update is not possible, disable or block the RDPSND audio channel to prevent audio data from reaching the vulnerable decoder.", "Verify that the system is running the patched version or has the audio channel disabled.", "Monitor application logs for any signs of memory corruption or crashes."], "summary": {"action": "Immediate Patch", "impact": "Heap Buffer Overflow"}, "threat_synthesis": {"affected_systems": "The flaw affects all FreeRDP releases prior to version 3.24.0. The affected product is FreeRDP (cpe:2.3:a:freerdp:freerdp:*:*:*:*:*:*:*:*). Any deployment of these older releases that processes audio streams via the RDPSND channel is vulnerable.", "description_and_impact": "The vulnerability is a size_t underflow in the IMA-ADPCM and MS-ADPCM audio decoders of FreeRDP, which results in a heap buffer overflow when audio data is received over the RDPSND channel. The underflow occurs during block header parsing when the size value becomes smaller than the header size, causing the subtraction to wrap around to a very large value. The loop then iterates an astronomical number of times, writing beyond the intended buffer. This heap corruption can lead to memory corruption, application crashes, or, in the worst case, arbitrary code execution, compromising confidentiality, integrity, and availability of the system.", "risk_and_exploitability": "The CVSS score is 6.5, indicating a medium severity. EPSS is below 1%, suggesting exploit likelihood is low, and the vulnerability is not listed in the CISA KEV catalog. Exploitation requires a Remote Desktop Protocol session where the server sends crafted audio data over the RDPSND channel; the attacker can trigger the buffer overflow by manipulating the block alignment parameter. While the current exploit probability is low, vulnerable systems remain at risk of denial of service or potential code execution under suitable conditions."}}}}, "created": "2026-03-16T09:24:51.913067+00:00", "updated": "2026-03-24T10:39:37.647949+00:00", "vendors": ["freerdp", "freerdp$PRODUCT$freerdp"]}