CVE-2026-27117

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{"affected": [{"affectedData": [{"product": "bit7z", "vendor": "rikyoz", "versions": [{"status": "affected", "version": "< 4.0.11"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:rikyoz:bit7z:*:*:*:*:*:*:*:*", "matchCriteriaId": "495AC7B7-7FAB-4BFA-BE04-58BD0C15D76C", "versionEndExcluding": "4.0.11", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "bit7z is a cross-platform C++ static library that allows the compression/extraction of archive files. Prior to version 4.0.11, a path traversal vulnerability (\"Zip Slip\") exists in bit7z's archive extraction functionality. The library does not adequately validate file paths contained in archive entries, allowing files to be written outside the intended extraction directory through three distinct mechanisms: relative path traversal, absolute path traversal, and symbolic link traversal. An attacker can exploit this by providing a malicious archive to any application that uses bit7z to extract untrusted archives. Successful exploitation results in arbitrary file write with the privileges of the process performing the extraction. This could lead to overwriting of application binaries, configuration files, or other sensitive data. The vulnerability does not directly enable reading of file contents; the confidentiality impact is limited to the calling application's own behavior after extraction. However, applications that subsequently serve or display extracted files may face secondary confidentiality risks from attacker-created symlinks. Fixes have been released in version 4.0.11. If upgrading is not immediately possible, users can mitigate the vulnerability by validating each entry's destination path before writing. Other mitigations include running extraction with least privilege and extracting untrusted archives in a sandboxed directory."}, {"lang": "es", "value": "bit7z es una librer\u00eda est\u00e1tica de C++ multiplataforma que permite la compresi\u00f3n/extracci\u00f3n de archivos de archivo. Antes de la versi\u00f3n 4.0.11, existe una vulnerabilidad de salto de ruta ('Zip Slip') en la funcionalidad de extracci\u00f3n de archivos de bit7z. La librer\u00eda no valida adecuadamente las rutas de archivo contenidas en las entradas del archivo, permitiendo que los archivos se escriban fuera del directorio de extracci\u00f3n previsto a trav\u00e9s de tres mecanismos distintos: salto de ruta relativo, salto de ruta absoluto y salto de enlace simb\u00f3lico. Un atacante puede explotar esto proporcionando un archivo malicioso a cualquier aplicaci\u00f3n que utilice bit7z para extraer archivos no confiables. Si se explota con \u00e9xito se logra la escritura arbitraria de archivos con los privilegios del proceso que realiza la extracci\u00f3n. Esto podr\u00eda llevar a la sobrescritura de binarios de aplicaciones, archivos de configuraci\u00f3n u otros datos sensibles. La vulnerabilidad no permite directamente la lectura del contenido de los archivos; el impacto en la confidencialidad se limita al propio comportamiento de la aplicaci\u00f3n llamante despu\u00e9s de la extracci\u00f3n. Sin embargo, las aplicaciones que posteriormente sirven o muestran archivos extra\u00eddos pueden enfrentar riesgos secundarios de confidencialidad debido a enlaces simb\u00f3licos creados por el atacante. Se han lanzado correcciones en la versi\u00f3n 4.0.11. Si no es posible actualizar de inmediato, los usuarios pueden mitigar la vulnerabilidad validando la ruta de destino de cada entrada antes de escribir. Otras mitigaciones incluyen ejecutar la extracci\u00f3n con m\u00ednimo privilegio y extraer archivos no confiables en un directorio aislado (sandboxed)."}], "id": "CVE-2026-27117", "lastModified": "2026-06-17T10:26:41.840", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27117", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-26T21:06:49.015939Z", "version": "2.0.3"}}]}, "published": "2026-02-24T22:16:32.053", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/rikyoz/bit7z/commit/31763da9a3e41a199c141c8d71f6c11de24b45cf"}, {"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/rikyoz/bit7z/commit/9e020483eefa5825ec9310b1d869933d4f77f969"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/rikyoz/bit7z/releases/tag/v4.0.11"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/rikyoz/bit7z/security/advisories/GHSA-qvjh-hhw4-3gx9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}, {"lang": "en", "value": "CWE-23"}, {"lang": "en", "value": "CWE-36"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-22"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.0.11)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "bit7z", "source": "cna", "vendor": "rikyoz"}, "product": "bit7z", "vendor": "rikyoz"}], "analysis": {"en": {"generated_at": "2026-04-18T17:43:21.087222+00:00", "value": {"mitigation_remediation": ["Upgrade the bit7z library to version 4.0.11 or newer.", "Validate each archive entry\u2019s destination path before writing files during extraction.", "Run the extraction process with the least privilege necessary, preferably in a sandboxed directory."], "summary": {"action": "Immediate Patch", "impact": "Arbitrary File Write"}, "threat_synthesis": {"affected_systems": "The flaw affects all installations of the rikyoz bit7z library version 4.0.10 and earlier, regardless of the operating system, including any custom applications that embed the library to extract archives. The specific update that removes the issue is version 4.0.11.", "description_and_impact": "bit7z is a C++ static library for handling archive files. A path traversal flaw, also called Zip Slip, exists in versions before 4.0.11. The library fails to validate paths in archive entries, allowing an attacker to create relative, absolute, or symbolic\u2011link paths that cause files to be written outside the target extraction directory. The result is arbitrary overwrite of any file the process can reach, which can modify application binaries, configuration files, or other sensitive data. The vulnerability does not grant direct file read access; any confidentiality risk arises only from how the calling application later uses or displays the extracted files, such as via symlinked content.", "risk_and_exploitability": "The score of 5.5 indicates a medium\u2011severity risk. Based on the description, it is inferred that the likely attack vector is an attacker supplying a crafted archive to an application that uses bit7z; this is typically possible in services that accept user\u2011uploaded archives. The EPSS value of less than 1% suggests a low probability of observed exploitation, and the flaw is not listed in the CISA KEV catalog. However, successful exploitation results in file write with the process\u2019s privileges, allowing potential modification of critical system or application files. The absence of input validation remains the core weakness identified by CWE\u201122, CWE\u201123, and CWE\u201136."}}}}, "created": "2026-02-25T11:35:25.390506+00:00", "updated": "2026-04-18T17:45:06.065605+00:00", "vendors": ["rikyoz", "rikyoz$PRODUCT$bit7z"]}