{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55206", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-16T16:16:32.627Z", "datePublished": "2026-07-08T20:32:09.905Z", "dateUpdated": "2026-07-08T20:32:09.905Z"}, "containers": {"cna": {"title": "py7zr: O(n^2) algorithmic complexity DoS in PackInfo._read()", "problemTypes": [{"descriptions": [{"cweId": "CWE-407", "lang": "en", "description": "CWE-407: Inefficient Algorithmic Complexity", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.7, "baseSeverity": "HIGH", "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", "version": "4.0"}}], "references": [{"name": "https://github.com/miurahr/py7zr/security/advisories/GHSA-h4gh-22qq-72r7", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/miurahr/py7zr/security/advisories/GHSA-h4gh-22qq-72r7"}, {"name": "https://github.com/miurahr/py7zr/commit/d7aa3a197d15c75a65b24f796d3a69f83806d3f8", "tags": ["x_refsource_MISC"], "url": "https://github.com/miurahr/py7zr/commit/d7aa3a197d15c75a65b24f796d3a69f83806d3f8"}, {"name": "https://github.com/miurahr/py7zr/releases/tag/v1.1.3", "tags": ["x_refsource_MISC"], "url": "https://github.com/miurahr/py7zr/releases/tag/v1.1.3"}], "affected": [{"vendor": "miurahr", "product": "py7zr", "versions": [{"version": "< 1.1.3", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-08T20:32:09.905Z"}, "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, PackInfo._read() in archiveinfo.py used an O(n^2) cumulative sum pattern for attacker-controlled numstreams values parsed from archive headers, allowing a crafted .7z archive to cause excessive CPU consumption during SevenZipFile.init() before extraction. This issue is fixed in version 1.1.3."}], "source": {"advisory": "GHSA-h4gh-22qq-72r7", "discovery": "UNKNOWN"}}}}

{}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.1.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "py7zr", "source": "cna", "vendor": "miurahr"}, "product": "py7zr", "vendor": "miurahr"}], "created": "2026-07-08T21:30:08.285963+00:00", "updated": "2026-07-08T21:30:08.285990+00:00", "vendors": ["miurahr", "miurahr$PRODUCT$py7zr"]}