CVE-2026-35582

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{"affected": [{"affectedData": [{"product": "emissary", "vendor": "NationalSecurityAgency", "versions": [{"status": "affected", "version": "< 8.43.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:nsa:emissary:*:*:*:*:*:*:*:*", "matchCriteriaId": "E8B2D162-B83D-4E41-A44D-616C0177B7D1", "versionEndExcluding": "8.43.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Emissary is a P2P based data-driven workflow engine. In versions 8.42.0 and below, Executrix.getCommand() is vulnerable to OS command injection because it interpolates temporary file paths into a /bin/sh -c shell command string without any escaping or input validation. The IN_FILE_ENDING and OUT_FILE_ENDING configuration keys flow directly into these paths, allowing a place author who can write or modify a .cfg file to inject arbitrary shell metacharacters that execute OS commands in the JVM process's security context. The framework already sanitizes placeName via an allowlist before embedding it in the same shell string, but applies no equivalent sanitization to file ending values. No runtime privileges beyond place configuration authorship, and no API or network access, are required to exploit this vulnerability. This is a framework-level defect with no safe mitigation available to downstream implementors, as Executrix provides neither escaping nor documented preconditions against metacharacters in file ending inputs. This issue has been fixed in version 8.43.0."}, {"lang": "es", "value": "Emissary es un motor de flujo de trabajo basado en P2P y dirigido por datos. En las versiones 8.42.0 e inferiores, Executrix.getCommand() es vulnerable a la inyecci\u00f3n de comandos del sistema operativo porque interpola rutas de archivos temporales en una cadena de comandos de shell /bin/sh -c sin ning\u00fan escape o validaci\u00f3n de entrada. Las claves de configuraci\u00f3n IN_FILE_ENDING y OUT_FILE_ENDING fluyen directamente a estas rutas, permitiendo que un autor de lugar que pueda escribir o modificar un archivo .cfg inyecte metacaracteres de shell arbitrarios que ejecuten comandos del sistema operativo en el contexto de seguridad del proceso JVM. El framework ya sanea placeName a trav\u00e9s de una lista de permitidos antes de incrustarlo en la misma cadena de shell, pero no aplica ninguna sanitizaci\u00f3n equivalente a los valores de terminaci\u00f3n de archivo. No se requieren privilegios de tiempo de ejecuci\u00f3n m\u00e1s all\u00e1 de la autor\u00eda de la configuraci\u00f3n del lugar, ni acceso a la API o a la red, para explotar esta vulnerabilidad. Este es un defecto a nivel de framework sin mitigaci\u00f3n segura disponible para los implementadores posteriores, ya que Executrix no proporciona ni escape ni precondiciones documentadas contra metacaracteres en las entradas de terminaci\u00f3n de archivo. Este problema ha sido solucionado en la versi\u00f3n 8.43.0."}], "id": "CVE-2026-35582", "lastModified": "2026-10-26T22:10:00.163", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-35582", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-20T15:48:23.954422Z", "version": "2.0.3"}}]}, "published": "2026-04-18T02:16:11.510", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/NationalSecurityAgency/emissary/commit/1faf33f2494c0128f250d7d2e8f2da99bbd32ae8"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/NationalSecurityAgency/emissary/security/advisories/GHSA-3p24-9x7v-7789"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}, {"lang": "en", "value": "CWE-116"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,8.43.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "emissary", "source": "cna", "vendor": "NationalSecurityAgency"}, "product": "emissary", "vendor": "nationalsecurityagency"}], "analysis": {"en": {"generated_at": "2026-04-18T08:41:53.019757+00:00", "value": {"mitigation_remediation": ["Upgrade Emissary to version 8.43.0 or later to eliminate the command injection flaw.", "If upgrading immediately is not possible, restrict write access to .cfg files to only trusted, least\u2011privileged users so that attackers cannot modify the IN_FILE_ENDING or OUT_FILE_ENDING values.", "Perform a thorough audit of existing configuration files to confirm that no malicious or unexpected file ending values are present.", "Monitor the system for abnormal process execution patterns that might indicate exploitation of the command injection path."], "summary": {"action": "Immediate Patch", "impact": "OS Command Injection"}, "threat_synthesis": {"affected_systems": "Emissary, a peer\u2011to\u2011peer workflow engine produced by the National Security Agency, is affected for all releases up to and including 8.42.0. The issue has been fixed in version 8.43.0, so installations that have not applied this update remain vulnerable.", "description_and_impact": "Executrix.getCommand() in Emissary versions 8.42.0 and earlier concatenates unvalidated IN_FILE_ENDING and OUT_FILE_ENDING values directly into a /bin/sh -c command string. Because the framework performs no escaping or input validation on these values, a configuration author who can edit a .cfg file can insert arbitrary shell metacharacters. The injected characters are executed by the JVM process with its local security context, giving the attacker the ability to run any OS command on the system where the framework is deployed.", "risk_and_exploitability": "The CVSS score of 8.8 classifies the vulnerability as high severity. Exploitation requires only the ability to modify configuration files, a privilege that does not depend on network or API access. EPSS data is not available and the vulnerability is not listed in the CISA KEV catalog. Because the injected command runs under the JVM process\u2019s security context, successful exploitation can lead to full system compromise in environments where configuration authors have write access."}}}}, "created": "2026-04-18T08:45:41.383281+00:00", "updated": "2026-04-20T14:58:56.443623+00:00", "vendors": ["nationalsecurityagency", "nationalsecurityagency$PRODUCT$emissary"]}