CVE-2026-54591

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-54591", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-15T19:45:23.539Z", "datePublished": "2026-07-08T20:33:57.420Z", "dateUpdated": "2026-07-09T14:40:52.505Z"}, "containers": {"cna": {"title": "AsyncSSH: SCP Path Traversal to Arbitrary File Write", "problemTypes": [{"descriptions": [{"cweId": "CWE-22", "lang": "en", "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f"}, {"name": "https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de", "tags": ["x_refsource_MISC"], "url": "https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de"}, {"name": "https://github.com/ronf/asyncssh/releases/tag/v2.23.1", "tags": ["x_refsource_MISC"], "url": "https://github.com/ronf/asyncssh/releases/tag/v2.23.1"}], "affected": [{"vendor": "ronf", "product": "asyncssh", "versions": [{"version": "< 2.23.1", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T20:33:57.420Z"}, "descriptions": [{"lang": "en", "value": "AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.1, a malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences because _parse_cd_args in scp.py returns server-provided names verbatim and _recv_files joins them to the destination path without enforcing the target directory boundary. This issue is fixed in version 2.23.1."}], "source": {"advisory": "GHSA-2wxc-x7rj-hg8f", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-09T14:21:05.079234Z", "id": "CVE-2026-54591", "options": [{"Exploitation": "none"}, {"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": "2026-07-09T14:40:52.505Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-54591", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-09T14:21:05.079234Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-09T14:21:05.827Z"}}], "cna": {"title": "AsyncSSH: SCP Path Traversal to Arbitrary File Write", "source": {"advisory": "GHSA-2wxc-x7rj-hg8f", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "ronf", "product": "asyncssh", "versions": [{"status": "affected", "version": "< 2.23.1"}]}], "references": [{"url": "https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f", "name": "https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de", "name": "https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/ronf/asyncssh/releases/tag/v2.23.1", "name": "https://github.com/ronf/asyncssh/releases/tag/v2.23.1", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.1, a malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences because _parse_cd_args in scp.py returns server-provided names verbatim and _recv_files joins them to the destination path without enforcing the target directory boundary. This issue is fixed in version 2.23.1."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-22", "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T20:33:57.420Z"}}}, "cveMetadata": {"cveId": "CVE-2026-54591", "state": "PUBLISHED", "dateUpdated": "2026-07-09T14:40:52.505Z", "dateReserved": "2026-06-15T19:45:23.539Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-07-08T20:33:57.420Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "asyncssh", "vendor": "ronf", "versions": [{"status": "affected", "version": "< 2.23.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.1, a malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences because _parse_cd_args in scp.py returns server-provided names verbatim and _recv_files joins them to the destination path without enforcing the target directory boundary. This issue is fixed in version 2.23.1."}, {"lang": "es", "value": "AsyncSSH es un paquete de Python que proporciona una implementaci\u00f3n as\u00edncrona de cliente y servidor del protocolo SSHv2 sobre el framework asyncio de Python. Antes de la versi\u00f3n 2.23.1, un servidor SSH malicioso puede escribir archivos arbitrarios en el sistema de archivos del cliente SCP de asyncssh enviando nombres de archivo que contienen secuencias de recorrido \u2019.. / \u2019 porque _parse_cd_args en scp.py devuelve los nombres proporcionados por el servidor textualmente y _recv_files los une a la ruta de destino sin hacer cumplir el l\u00edmite del directorio de destino. Este problema est\u00e1 solucionado en la versi\u00f3n 2.23.1."}], "id": "CVE-2026-54591", "lastModified": "2026-10-25T17:10:00.197", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54591", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-09T14:21:05.079234Z", "version": "2.0.3"}}]}, "published": "2026-07-08T21:16:49.657", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de"}, {"source": "security-advisories@github.com", "url": "https://github.com/ronf/asyncssh/releases/tag/v2.23.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "asyncssh: AsyncSSH: Arbitrary file write via path traversal in SCP client", "id": "2498244", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498244"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H", "status": "draft"}, "cwe": "CWE-22", "details": ["AsyncSSH is a Python package which provides an asynchronous client and server implementation of the SSHv2 protocol on top of the Python asyncio framework. Prior to 2.23.1, a malicious SSH server can write arbitrary files on the asyncssh SCP client's filesystem by sending filenames containing ../ traversal sequences because _parse_cd_args in scp.py returns server-provided names verbatim and _recv_files joins them to the destination path without enforcing the target directory boundary. This issue is fixed in version 2.23.1.", "A flaw was found in AsyncSSH, a Python package for SSHv2 protocol implementation. A malicious SSH server could exploit this vulnerability by sending specially crafted filenames containing directory traversal sequences to an AsyncSSH SCP client. This could allow the server to write arbitrary files to the client's filesystem, leading to unauthorized data modification or system disruption."], "mitigation": {"lang": "en:us", "value": "The core risk of this flaw is that the malicious server uses a path traversal trick to write files where it shouldn't on your client (like overwriting /etc/shadow or critical system binaries). By making the container's root filesystem read-only, you completely neutralize this attack. Even if the vulnerability is triggered, the container's kernel will block the unauthorized write attempt."}, "name": "CVE-2026-54591", "public_date": "2026-07-08T20:33:57Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-54591\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-54591\nhttps://github.com/ronf/asyncssh/commit/d730803b8e4e94c20c7580d90f94d1e05f9f58de\nhttps://github.com/ronf/asyncssh/releases/tag/v2.23.1\nhttps://github.com/ronf/asyncssh/security/advisories/GHSA-2wxc-x7rj-hg8f"], "statement": "This Important flaw in AsyncSSH's SCP client allows a malicious SSH server to perform arbitrary file writes on the client's filesystem through directory traversal. This occurs when an AsyncSSH SCP client connects to a compromised or malicious server, enabling unauthorized data modification or system disruption on the client.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.23.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "asyncssh", "source": "cna", "vendor": "ronf"}, "product": "asyncssh", "vendor": "ronf"}], "created": "2026-07-09T04:15:12.518209+00:00", "updated": "2026-08-01T15:45:04.317483+00:00", "vendors": ["ronf", "ronf$PRODUCT$asyncssh"]}