{"id":"UBUNTU-CVE-2026-116742","details":"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.","modified":"2026-10-28T20:17:46.301628851Z","published":"2026-10-26T22:16:00Z","upstream":["CVE-2026-116742"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-116742"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-116742"},{"type":"REPORT","url":"https://github.com/samtools/htslib"},{"type":"REPORT","url":"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/116xxx/cve-2026-116742.json"},{"type":"REPORT","url":"https://github.com/samtools/htslib/blob/1.24/bgzf.c#l2504"},{"type":"REPORT","url":"https://github.com/samtools/htslib/commit/18dddf02bb2c0053b32acec427723555a24b2873"},{"type":"REPORT","url":"https://github.com/samtools/htslib/issues/2113"},{"type":"REPORT","url":"https://github.com/samtools/htslib/pull/2057"},{"type":"REPORT","url":"https://hackmd.io/@haindpwn/htslib-bgzf-gzi-int-truncation-oob"},{"type":"REPORT","url":"https://nvd.nist.gov/vuln/detail/cve-2026-116742"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/htslib-through-1.24-heap-out-of-bounds-write-via-truncated-gzi-index-count"}],"affected":[{"package":{"name":"htslib","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/htslib?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.2.0~rc3-1","0.2.0~rc3-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"htslib-test","binary_version":"0.2.0~rc3-1ubuntu0.1~esm1"},{"binary_name":"libhts0","binary_version":"0.2.0~rc3-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116742.json"}},{"package":{"name":"htslib","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/htslib?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.1-1","1.2.1-2","1.2.1-2ubuntu1","1.2.1-2ubuntu1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.2.1-2ubuntu1+esm1","binary_name":"htslib-test"},{"binary_version":"1.2.1-2ubuntu1+esm1","binary_name":"libhts1"},{"binary_version":"1.2.1-2ubuntu1+esm1","binary_name":"tabix"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116742.json"}},{"package":{"name":"htslib","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/htslib?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5-1","1.5-4ubuntu1","1.6-3ubuntu1","1.6-4","1.6-4build1","1.7-2","1.7-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"htslib-test","binary_version":"1.7-2ubuntu0.1~esm1"},{"binary_version":"1.7-2ubuntu0.1~esm1","binary_name":"libhts2"},{"binary_name":"tabix","binary_version":"1.7-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116742.json"}},{"package":{"name":"htslib","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/htslib?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9-10","1.9-11","1.9-12","1.10.2-2ubuntu1","1.10.2-2ubuntu2","1.10.2-3","1.10.2-3ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"htslib-test","binary_version":"1.10.2-3ubuntu0.1"},{"binary_name":"libhts3","binary_version":"1.10.2-3ubuntu0.1"},{"binary_version":"1.10.2-3ubuntu0.1","binary_name":"tabix"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116742.json"}},{"package":{"name":"htslib","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/htslib?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13+ds-2","1.13+ds-2build1"],"ecosystem_specific":{"binaries":[{"binary_name":"htslib-test","binary_version":"1.13+ds-2build1"},{"binary_version":"1.13+ds-2build1","binary_name":"libhts3"},{"binary_name":"tabix","binary_version":"1.13+ds-2build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116742.json"}},{"package":{"name":"htslib","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/htslib?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.17+ds-1","1.18+ds-1","1.19+ds-1.1build2","1.19+ds-1.1build3"],"ecosystem_specific":{"binaries":[{"binary_name":"htslib-test","binary_version":"1.19+ds-1.1build3"},{"binary_version":"1.19+ds-1.1build3","binary_name":"libhts3t64"},{"binary_version":"1.19+ds-1.1build3","binary_name":"tabix"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116742.json"}},{"package":{"name":"htslib","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/htslib?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"i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