{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-116742", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-26T20:23:36.636Z", "datePublished": "2026-10-26T21:52:41.511Z", "dateUpdated": "2026-10-26T21:52:41.511Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-26T21:52:41.511Z"}, "datePublic": "2026-07-31T00:00:00.000Z", "title": "HTSlib through 1.24 Heap Out-of-Bounds Write via Truncated .gzi Index Count", "descriptions": [{"lang": "en", "value": "HTSlib through 1.24 contains a heap out-of-bounds write and read vulnerability in bgzf_index_load_hfile() in bgzf.c that allows attackers to corrupt heap memory by supplying a crafted .gzi index entry count. A count of 0xFFFFFFFF truncates noffs to zero, causing writes past a malloc(0) buffer and an offs[-1] read in bgzf_useek(), resulting in heap corruption or crashes in tools like samtools and bcftools."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Numeric Truncation Error", "cweId": "CWE-197", "type": "CWE"}]}], "affected": [{"vendor": "samtools", "product": "htslib", "defaultStatus": "unaffected", "versions": [{"version": "0", "status": "affected", "versionType": "custom", "lessThanOrEqual": "1.24"}], "packageURL": "pkg:github/samtools/htslib", "repo": "https://github.com/samtools/htslib"}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:htslib:htslib:*:*:*:*:*:*:*:*", "versionEndIncluding": "1.24"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "LOW", "baseScore": 4.4, "baseSeverity": "MEDIUM"}}], "references": [{"url": "https://github.com/samtools/htslib/pull/2057", "tags": ["issue-tracking", "patch"], "name": "Pull Request #2057"}, {"url": "https://github.com/samtools/htslib/commit/18dddf02bb2c0053b32acec427723555a24b2873", "tags": ["patch"], "name": "Patch Commit"}, {"url": "https://github.com/samtools/htslib", "tags": ["product"]}, {"url": "https://github.com/samtools/htslib/blob/1.24/bgzf.c#L2504", "tags": ["technical-description"]}, {"url": "https://hackmd.io/@haindpwn/htslib-bgzf-gzi-int-truncation-oob", "tags": ["third-party-advisory"]}, {"url": "https://github.com/samtools/htslib/issues/2113", "tags": ["issue-tracking"]}, {"name": "VulnCheck Advisory: HTSlib through 1.24 Heap Out-of-Bounds Write via Truncated .gzi Index Count", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/htslib-through-1.24-heap-out-of-bounds-write-via-truncated-gzi-index-count"}], "credits": [{"lang": "en", "value": "HaiND from the Post and Telecommunication Institute of Technology", "type": "finder"}, {"lang": "en", "value": "daviesrob", "type": "remediation developer"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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