{"id":"CVE-2020-36403","aliases":["DEBIAN-CVE-2020-36403","EUVD-2020-23931","GHSA-9cpm-77gg-x323","OESA-2022-1962","OESA-2022-1963","UBUNTU-CVE-2020-36403","openSUSE-SU-2021:1177-1"],"status":"published","title":"HTSlib 1.10 through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from...","description":"HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01593,"percentile":0.75904,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2021-07-01T02:51:43Z","modified":"2026-10-26T12:02:49Z","fixes":[{"ecosystem":"Debian:12","package":"htslib","fixed_in":["1.11-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"htslib","fixed_in":["1.11-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"htslib","fixed_in":["1.11-1"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP1","package":"htslib","fixed_in":["1.11-1.oe1"],"sources":["osv"]},{"ecosystem":"openEuler:20.03-LTS-SP3","package":"htslib","fixed_in":["1.11-1.oe1"],"sources":["osv"]},{"ecosystem":"SUSE:Package Hub 15 SP2","package":"libhts","fixed_in":["1.10.2-bp153.2.5.1"],"sources":["osv"]},{"ecosystem":"SUSE:Package Hub 15 SP3","package":"libhts","fixed_in":["1.10.2-bp153.2.5.1"],"sources":["osv"]},{"ecosystem":"openSUSE:Leap 15.2","package":"libhts","fixed_in":["1.10.2-bp153.2.5.1"],"sources":["osv"]},{"ecosystem":"openSUSE:Leap 15.3","package":"libhts","fixed_in":["1.10.2-bp153.2.5.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"htslib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"htslib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"htslib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11-1"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP1","package":"htslib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11-1.oe1"}]}]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP3","package":"htslib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11-1.oe1"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"htslib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.2.0~rc3-1","0.2.0~rc3-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"htslib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.1-1","1.2.1-2","1.2.1-2ubuntu1","1.2.1-2ubuntu1+esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"htslib","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"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"htslib","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"]},{"source":"osv","ecosystem":"SUSE:Package Hub 15 SP2","package":"libhts","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.2-bp153.2.5.1"}]}]},{"source":"osv","ecosystem":"SUSE:Package Hub 15 SP3","package":"libhts","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.2-bp153.2.5.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Leap 15.2","package":"libhts","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.2-bp153.2.5.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Leap 15.3","package":"libhts","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.2-bp153.2.5.1"}]}]}],"products":[{"vendor":"htslib","product":"htslib"}],"references":[{"url":"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24097","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Patch","Third Party Advisory","fix","report"]},{"url":"https://github.com/samtools/htslib/commit/dcd4b7304941a8832fba2d0fc4c1e716e7a4e72c","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","report"]},{"url":"https://github.com/google/oss-fuzz-vulns/blob/main/vulns/htslib/OSV-2020-955.yaml","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","report"]},{"url":"https://github.com/samtools/htslib/pull/1447","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36403","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-9cpm-77gg-x323"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-36403","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1962","tags":["advisory"]},{"url":"https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1963","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-36403","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-36403","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/BBQ3P4CDK2RZWTSHMKMA7FGIAJRHWW4Q/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1187917","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2020-36403","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2020-36403","description":"HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).","status":"published","published":"2021-07-01T02:51:43Z","modified":"2024-08-04T17:23:10.582Z","updated_at":"2026-11-02T14:35:55.128961Z"}],"euvd":[{"id":"EUVD-2020-23931","description":"HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).","status":"published","published":"2021-07-01T02:51:43Z","modified":"2024-08-04T17:23:10Z","updated_at":"2026-11-03T03:07:03.484914Z"}],"ghsa":[{"id":"GHSA-9cpm-77gg-x323","title":"HTSlib 1.10 through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from...","description":"HTSlib 1.10 through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).","status":"published","published":"2022-05-24T19:06:46Z","modified":"2023-01-27T05:03:00Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:42:09.126228Z"}],"nvd":[{"id":"CVE-2020-36403","description":"HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).","status":"published","published":"2021-07-01T03:15:07.893Z","modified":"2026-06-17T03:15:25.253Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:06:44.292752Z"}],"osv":[{"id":"CVE-2020-36403","description":"HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).","status":"published","published":"2021-07-01T03:15:07.893Z","modified":"2026-04-11T09:46:25.435206Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:16.936975Z"},{"id":"DEBIAN-CVE-2020-36403","description":"HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).","status":"published","published":"2021-07-01T03:15:07.893Z","modified":"2026-10-26T12:02:49.719971158Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:34.019707Z"},{"id":"OESA-2022-1962","title":"htslib security update","description":"HTSlib is an implementation of a unified C library for accessing common file  formats, such as SAM, CRAM and VCF, used for high-throughput sequencing data,  and is the core library used by samtools and bcftools. HTSlib only depends on  zlib. It is known to be compatible with gcc, g++ and clang. HTSlib implements a generalized BAM index, with file extension .csi ( coordinate-sorted index). The HTSlib file reader first looks for the new index and then for the old if the new index is absent.\r\n\r\nSecurity Fix(es):\r\n\r\nHTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).(CVE-2020-36403)","status":"published","published":"2022-09-23T11:05:16Z","modified":"2026-08-18T01:17:18.65704809Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:39.528805Z"},{"id":"OESA-2022-1963","title":"htslib security update","description":"HTSlib is an implementation of a unified C library for accessing common file  formats, such as SAM, CRAM and VCF, used for high-throughput sequencing data,  and is the core library used by samtools and bcftools. HTSlib only depends on  zlib. It is known to be compatible with gcc, g++ and clang. HTSlib implements a generalized BAM index, with file extension .csi ( coordinate-sorted index). The HTSlib file reader first looks for the new index and then for the old if the new index is absent.\r\n\r\nSecurity Fix(es):\r\n\r\nHTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).(CVE-2020-36403)","status":"published","published":"2022-09-23T11:05:16Z","modified":"2026-08-18T01:17:18.703530582Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:39.528805Z"},{"id":"UBUNTU-CVE-2020-36403","description":"HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).","status":"published","published":"2021-07-01T03:15:00Z","modified":"2026-04-22T12:41:27.923931Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:25.179924Z"},{"id":"openSUSE-SU-2021:1177-1","title":"Security update for libhts","description":"\nThis update of libhts fixes the following security issue:\n\n- CVE-2020-36403: Fixed an out-of-bounds write access in vcf_parse_format() (bsc#1187917)\n  ","status":"published","published":"2021-08-22T08:06:15Z","modified":"2026-02-04T03:59:42.063419Z","updated_at":"2026-11-02T16:58:32.266854Z"}]}}