CVE-2026-55195

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{"affected": [{"affectedData": [{"product": "py7zr", "vendor": "miurahr", "versions": [{"status": "affected", "version": "< 1.1.3"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "py7zr is a Python-based library and utility to support 7zip archive compression, decompression, encryption and decryption. Prior to 1.1.3, py7zr's Worker.decompress() extracted archive entries without tracking total decompressed size, allowing a crafted .7z file such as a 15.6 KB archive that expands to 100 MB to exhaust disk or memory before extraction completes. This issue is fixed in version 1.1.3."}, {"lang": "es", "value": "py7zr es una biblioteca y utilidad basada en Python para dar soporte a la compresi\u00f3n, descompresi\u00f3n, cifrado y descifrado de archivos 7zip. Antes de la 1.1.3, el m\u00e9todo Worker.decompress() de py7zr extra\u00eda entradas de archivo sin rastrear el tama\u00f1o total descomprimido, permitiendo que un archivo .7z manipulado, como un archivo de 15.6 KB que se expande a 100 MB, agotara el disco o la memoria antes de que la extracci\u00f3n finalizara. Este problema se corrigi\u00f3 en la versi\u00f3n 1.1.3."}], "id": "CVE-2026-55195", "lastModified": "2026-10-25T17:10:00.197", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55195", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-09T14:05:14.472398Z", "version": "2.0.3"}}]}, "published": "2026-07-08T21:16:49.840", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/miurahr/py7zr/commit/28faf107b64374fa5a02bfb93aa2024e281ca97b"}, {"source": "security-advisories@github.com", "url": "https://github.com/miurahr/py7zr/releases/tag/v1.1.3"}, {"source": "security-advisories@github.com", "url": "https://github.com/miurahr/py7zr/security/advisories/GHSA-gjrg-mpp7-g774"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/miurahr/py7zr/security/advisories/GHSA-gjrg-mpp7-g774"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-409"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "py7zr: py7zr: Denial of Service via decompression bomb in 7zip archive extraction", "id": "2498255", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498255"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-409", "details": ["A flaw was found in py7zr, a Python library for 7zip archive handling. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by providing a specially crafted .7z file. The `Worker.decompress()` function fails to track the total decompressed size, enabling a small archive to expand significantly and exhaust system resources such as disk space or memory during extraction. This issue is also known as a decompression bomb (CWE-409)."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-55195", "public_date": "2026-07-08T20:30:58Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-55195\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-55195\nhttps://github.com/miurahr/py7zr/commit/28faf107b64374fa5a02bfb93aa2024e281ca97b\nhttps://github.com/miurahr/py7zr/releases/tag/v1.1.3\nhttps://github.com/miurahr/py7zr/security/advisories/GHSA-gjrg-mpp7-g774"], "statement": "This Moderate impact flaw in the py7zr Python library can lead to a denial of service when processing specially crafted 7zip archives. An attacker could provide a malicious archive that, upon decompression, exhausts system resources such as disk space or memory, impacting the availability of services that utilize py7zr for archive handling.", "threat_severity": "Moderate"}

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