UBUNTU-CVE-2026-31969 (CVE-2026-31969)
Vulnerability from osv_ubuntu – Published: 2026-03-18 20:16 – Updated: 2026-05-20 15:27 – Source website
VLAI
Details
HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data using a variety of encodings and compression methods. When reading data encoded using the BYTE_ARRAY_STOP method, an out-by-one error in the cram_byte_array_stop_decode_char() function check for a full output buffer could result in a single attacker-controlled byte being written beyond the end of a heap allocation. Exploiting this bug causes a heap buffer overflow. If a user opens a file crafted to exploit this issue, it could lead to the program crashing, or overwriting of data and heap structures in ways not expected by the program. It may be possible to use this to obtain arbitrary code execution. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue.
Severity
8.1 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "htslib",
"purl": "pkg:deb/ubuntu/htslib@0.2.0~rc3-1ubuntu0.1~esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.2.0~rc3-1",
"0.2.0~rc3-1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "htslib-test",
"binary_version": "1.2.1-2ubuntu1+esm1"
},
{
"binary_name": "libhts1",
"binary_version": "1.2.1-2ubuntu1+esm1"
},
{
"binary_name": "tabix",
"binary_version": "1.2.1-2ubuntu1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "htslib",
"purl": "pkg:deb/ubuntu/htslib@1.2.1-2ubuntu1+esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.1-1",
"1.2.1-2",
"1.2.1-2ubuntu1",
"1.2.1-2ubuntu1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "htslib-test",
"binary_version": "1.7-2ubuntu0.1~esm1"
},
{
"binary_name": "libhts2",
"binary_version": "1.7-2ubuntu0.1~esm1"
},
{
"binary_name": "tabix",
"binary_version": "1.7-2ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "htslib",
"purl": "pkg:deb/ubuntu/htslib@1.7-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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": "1.10.2-3ubuntu0.1"
},
{
"binary_name": "libhts3",
"binary_version": "1.10.2-3ubuntu0.1"
},
{
"binary_name": "tabix",
"binary_version": "1.10.2-3ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "htslib",
"purl": "pkg:deb/ubuntu/htslib@1.10.2-3ubuntu0.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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": "1.13+ds-2build1"
},
{
"binary_name": "libhts3",
"binary_version": "1.13+ds-2build1"
},
{
"binary_name": "tabix",
"binary_version": "1.13+ds-2build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "htslib",
"purl": "pkg:deb/ubuntu/htslib@1.13+ds-2build1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.13+ds-2",
"1.13+ds-2build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "htslib-test",
"binary_version": "1.19+ds-1.1build3"
},
{
"binary_name": "libhts3t64",
"binary_version": "1.19+ds-1.1build3"
},
{
"binary_name": "tabix",
"binary_version": "1.19+ds-1.1build3"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "htslib",
"purl": "pkg:deb/ubuntu/htslib@1.19+ds-1.1build3?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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": "1.21+ds-1"
},
{
"binary_name": "libhts3t64",
"binary_version": "1.21+ds-1"
},
{
"binary_name": "tabix",
"binary_version": "1.21+ds-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "htslib",
"purl": "pkg:deb/ubuntu/htslib@1.21+ds-1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.21+ds-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "htslib-test",
"binary_version": "1.22.1+ds2-1"
},
{
"binary_name": "libhts3t64",
"binary_version": "1.22.1+ds2-1"
},
{
"binary_name": "tabix",
"binary_version": "1.22.1+ds2-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "htslib",
"purl": "pkg:deb/ubuntu/htslib@1.22.1+ds2-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.21+ds-1",
"1.22.1+ds2-1"
]
}
],
"aliases": [],
"details": "HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data using a variety of encodings and compression methods. When reading data encoded using the `BYTE_ARRAY_STOP` method, an out-by-one error in the `cram_byte_array_stop_decode_char()` function check for a full output buffer could result in a single attacker-controlled byte being written beyond the end of a heap allocation. Exploiting this bug causes a heap buffer overflow. If a user opens a file crafted to exploit this issue, it could lead to the program crashing, or overwriting of data and heap structures in ways not expected by the program. It may be possible to use this to obtain arbitrary code execution. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue.",
"id": "UBUNTU-CVE-2026-31969",
"modified": "2026-05-20T15:27:20Z",
"published": "2026-03-18T20:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-31969"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-31969"
},
{
"type": "REPORT",
"url": "https://github.com/samtools/htslib/security/advisories/GHSA-q4cj-f4h5-fqgc"
},
{
"type": "REPORT",
"url": "https://github.com/samtools/htslib/commit/88cdf69e4b83bb550ab4f6f7134892c2ad1978f4"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-31969"
]
}
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Sightings
| Author | Source | Type | Date | Other |
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Nomenclature
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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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