CVE-2026-4851

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-4851", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2026-03-25T14:56:47.454Z", "datePublished": "2026-03-29T00:22:22.578Z", "dateUpdated": "2026-04-01T14:17:48.164Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "GRID-Machine", "product": "GRID::Machine", "programFiles": ["lib/GRID/Machine/Message.pm"], "programRoutines": [{"name": "GRID::Machine::read_operation()"}], "vendor": "CASIANO", "versions": [{"lessThanOrEqual": "0.127", "status": "affected", "version": "0", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Pied Crow crow@cpan.org"}], "descriptions": [{"lang": "en", "value": "GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization.\n\nGRID::Machine provides Remote Procedure Calls (RPC) over SSH for Perl. The client connects to remote hosts to execute code on them. A compromised or malicious remote host can execute arbitrary code back on the client through unsafe deserialization in the RPC protocol.\n\nread_operation() in lib/GRID/Machine/Message.pm deserialises values from the remote side using eval()\n\n $arg .= '$VAR1';\n my $val = eval \"no strict; $arg\"; # line 40-41\n\n$arg is raw bytes from the protocol pipe. A compromised remote host can embed arbitrary perl in the Dumper-formatted response:\n\n $VAR1 = do { system(\"...\"); };\n\nThis executes on the client silently on every RPC call, as the return values remain correct.\n\nThis functionality is by design but the trust requirement for the remote host is not documented in the distribution."}], "impacts": [{"capecId": "CAPEC-586", "descriptions": [{"lang": "en", "value": "CAPEC-586 Object Injection"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-502", "description": "CWE-502 Deserialization of Untrusted Data", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-95", "description": "CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2026-03-29T00:22:22.578Z"}, "references": [{"tags": ["third-party-advisory"], "url": "https://www.openwall.com/lists/oss-security/2026/03/26/6"}], "source": {"discovery": "UNKNOWN"}, "timeline": [{"lang": "en", "time": "2026-03-24T00:00:00.000Z", "value": "Vulnerability reported to module author and CPANSec"}, {"lang": "en", "time": "2026-03-25T00:00:00.000Z", "value": "CVE assigned by CPANSec"}, {"lang": "en", "time": "2026-03-26T00:00:00.000Z", "value": "Author confirmed module is unmaintained, no fix available"}, {"lang": "en", "time": "2026-03-26T00:00:00.000Z", "value": "Disclosed on oss-security mailing list"}], "title": "GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization", "workarounds": [{"lang": "en", "value": "There is no fix available. If used, only connect to trusted remote hosts."}], "x_generator": {"engine": "cpansec-cna-tool 0.1"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/03/26/6"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-03-29T00:23:56.336Z"}}, {"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-04-01T14:17:04.307893Z", "id": "CVE-2026-4851", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-01T14:17:48.164Z"}}]}}

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{"affected": [{"affectedData": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "GRID-Machine", "product": "GRID::Machine", "programFiles": ["lib/GRID/Machine/Message.pm"], "programRoutines": [{"name": "GRID::Machine::read_operation()"}], "vendor": "CASIANO", "versions": [{"lessThanOrEqual": "0.127", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:casiano:grid\\:\\:machine:*:*:*:*:*:perl:*:*", "matchCriteriaId": "B3148991-8DC2-4D2F-8EC2-0DCB0E5B6A63", "versionEndIncluding": "0.127", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "GRID::Machine versions through 0.127 for Perl allows arbitrary code execution via unsafe deserialization.\n\nGRID::Machine provides Remote Procedure Calls (RPC) over SSH for Perl. The client connects to remote hosts to execute code on them. A compromised or malicious remote host can execute arbitrary code back on the client through unsafe deserialization in the RPC protocol.\n\nread_operation() in lib/GRID/Machine/Message.pm deserialises values from the remote side using eval()\n\n $arg .= '$VAR1';\n my $val = eval \"no strict; $arg\"; # line 40-41\n\n$arg is raw bytes from the protocol pipe. A compromised remote host can embed arbitrary perl in the Dumper-formatted response:\n\n $VAR1 = do { system(\"...\"); };\n\nThis executes on the client silently on every RPC call, as the return values remain correct.\n\nThis functionality is by design but the trust requirement for the remote host is not documented in the distribution."}, {"lang": "es", "value": "Las versiones de GRID::Machine hasta la 0.127 para Perl permiten ejecuci\u00f3n de c\u00f3digo arbitrario a trav\u00e9s de deserializaci\u00f3n insegura.\n\nGRID::Machine proporciona Llamadas a Procedimientos Remotos (RPC) sobre SSH para Perl. El cliente se conecta a hosts remotos para ejecutar c\u00f3digo en ellos. Un host remoto comprometido o malicioso puede ejecutar c\u00f3digo arbitrario de vuelta en el cliente a trav\u00e9s de deserializaci\u00f3n insegura en el protocolo RPC.\n\nread_operation() en lib/GRID/Machine/Message.pm deserializa valores del lado remoto usando eval()\n\n $arg .= '$VAR1';\n my $val = eval \"no strict; $arg\"; # l\u00ednea 40-41\n\n$arg son bytes en bruto de la tuber\u00eda del protocolo. Un host remoto comprometido puede incrustar Perl arbitrario en la respuesta con formato Dumper:\n\n $VAR1 = do { system(\"...\"); };\n\nEsto se ejecuta en el cliente silenciosamente en cada llamada RPC, ya que los valores de retorno permanecen correctos.\n\nEsta funcionalidad es intencional, pero el requisito de confianza para el host remoto no est\u00e1 documentado en la distribuci\u00f3n."}], "id": "CVE-2026-4851", "lastModified": "2026-06-17T10:57:20.807", "metrics": {"cvssMetricV31": [{"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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-4851", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-01T14:17:04.307893Z", "version": "2.0.3"}}]}, "published": "2026-03-29T01:15:56.967", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Mailing List"], "url": "https://www.openwall.com/lists/oss-security/2026/03/26/6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List"], "url": "http://www.openwall.com/lists/oss-security/2026/03/26/6"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-95"}, {"lang": "en", "value": "CWE-502"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,0.127]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "GRID::Machine", "source": "cna", "vendor": "CASIANO"}, "product": "grid::machine", "vendor": "casiano"}], "analysis": {"en": {"generated_at": "2026-04-01T06:44:34.029382+00:00", "value": {"mitigation_remediation": ["Connect to remote hosts only if they are fully trusted, using explicit host whitelisting or firewall rules", "Verify that all machines participating in RPC are free from compromise and regularly audited", "If possible, isolate the client from untrusted networks or use a separate user context with limited privileges", "Monitor network traffic for unexpected RPC calls and log any deserialization activity"], "summary": {"action": "Restrict hosts", "impact": "Arbitrary code execution on client via unsafe deserialization"}, "threat_synthesis": {"affected_systems": "The vulnerability affects all releases of CASIANO\u2019s GRID::Machine for Perl up to and including version 0.127. In these versions the RPC interface accepts responses from any remote host without authentication or validation, meaning that any machine the client trusts and connects to could trigger the payload.", "description_and_impact": "GRID::Machine, a Perl library that provides remote procedure calls over SSH, deserializes data from the remote side using eval without strictness checks. The binary payload from the RPC protocol is concatenated into a string and evaluated, allowing an attacker who controls or compromises the remote host to inject arbitrary Perl code, such as system calls, that executes silently on the client. This results in full code execution on the client with the permissions of the running user, potentially compromising confidentiality, integrity, and availability of the client system.", "risk_and_exploitability": "With a CVSS score of 9.8 the flaw is a critical remote code execution vulnerability. Although the EPSS score is below 1 per cent and the issue is not listed in the CISA KEV catalog, the lack of a patch means the attack surface remains open. In practice an attacker must possess or compromise a remote host that the client connects to via the RPC mechanism; once that condition is met, the expluatation path is straightforward through the unsafe eval. Until mitigation is applied the risk to all affected installations is high and the impact could be total system compromise."}}}}, "created": "2026-03-29T20:31:53.328836+00:00", "updated": "2026-04-02T07:55:07.694551+00:00", "vendors": ["casiano", "casiano$PRODUCT$grid::machine"]}