{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-119602", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-30T11:46:47.302Z", "datePublished": "2026-10-30T13:18:20.547Z", "dateUpdated": "2026-10-30T13:18:20.547Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-30T13:18:20.547Z"}, "datePublic": "2026-10-21T00:00:00.000Z", "title": "libmspack through 0.11alpha Uninitialized Memory Disclosure via MS-ZIP Decompressor Window", "descriptions": [{"lang": "en", "value": "libmspack through 0.11alpha contains an uninitialized memory disclosure vulnerability in the MS-ZIP decompressor that allows attackers to leak heap data via unchecked back-reference distances. Attackers can supply a crafted MS-ZIP CAB file whose first block begins with a back-reference, causing cabd->extract() to write up to 32 KiB of stale heap memory into extracted output."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Use of Uninitialized Resource", "cweId": "CWE-908", "type": "CWE"}]}], "affected": [{"vendor": "kyz", "product": "libmspack", "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThanOrEqual": "0.11alpha", "status": "affected", "versionType": "custom"}], "packageURL": "pkg:github/kyz/libmspack", "repo": "https://github.com/kyz/libmspack"}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:libmspack_project:libmspack:*:*:*:*:*:*:*:*", "versionEndIncluding": "0.11alpha"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.3, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW"}}], "references": [{"url": "https://github.com/kyz/libmspack/issues/60", "tags": ["issue-tracking"]}, {"url": "https://github.com/kyz/libmspack/blob/v0.11alpha/libmspack/mspack/mszipd.c#L264-L276", "tags": ["technical-description"]}, {"url": "https://hackmd.io/@haindpwn/libmspack-mszip-uninit-window-info-leak", "tags": ["third-party-advisory"]}, {"url": "https://github.com/kyz/libmspack", "tags": ["product"]}, {"name": "VulnCheck Advisory: libmspack through 0.11alpha Uninitialized Memory Disclosure via MS-ZIP Decompressor Window", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/libmspack-through-0-11alpha-uninitialized-memory-disclosure-via-ms-zip-decompressor-window"}], "credits": [{"lang": "en", "value": "HaiND from the Post and Telecommunication Institute of Technology", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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