Vulnerability-Lookup

UBUNTU-CVE-2026-116742 (CVE-2026-116742)

Vulnerability from osv_ubuntu – Published: 2026-10-26 22:16 – Updated: 2026-10-28 17:50 – Source website

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.

Severity

4.4 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

4.4 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

4.8 (Medium)


                    
                      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

4.8 (Medium)


                    
                      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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-116742	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-116742	REPORT
	https://github.com/samtools/htslib	REPORT
	https://github.com/cveproject/cvelistv5/tree/main…	REPORT
	https://github.com/samtools/htslib/blob/1.24/bgzf…	REPORT
	https://github.com/samtools/htslib/commit/18dddf0…	REPORT
	https://github.com/samtools/htslib/issues/2113	REPORT
	https://github.com/samtools/htslib/pull/2057	REPORT
	https://hackmd.io/@haindpwn/htslib-bgzf-gzi-int-t…	REPORT
	https://nvd.nist.gov/vuln/detail/cve-2026-116742	REPORT
	https://www.vulncheck.com/advisories/htslib-throu…	REPORT

JSON

To clipboard

{
  "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"
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          ],
          "type": "ECOSYSTEM"
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      ],
      "versions": [
        "0.2.0~rc3-1",
        "0.2.0~rc3-1ubuntu0.1~esm1"
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    },
    {
      "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"
          }
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      },
      "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"
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      ],
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        "1.2.1-2",
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      ]
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      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "htslib-test",
            "binary_version": "1.7-2ubuntu0.1~esm1"
          },
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            "binary_name": "libhts2",
            "binary_version": "1.7-2ubuntu0.1~esm1"
          },
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            "binary_name": "tabix",
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      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
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      ],
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        "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"
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      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "htslib",
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      },
      "ranges": [
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        "1.9-11",
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        "1.10.2-2ubuntu2",
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        "1.10.2-3ubuntu0.1"
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    },
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      "ecosystem_specific": {
        "binaries": [
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            "binary_name": "htslib-test",
            "binary_version": "1.13+ds-2build1"
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            "binary_name": "libhts3",
            "binary_version": "1.13+ds-2build1"
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            "binary_name": "tabix",
            "binary_version": "1.13+ds-2build1"
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      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "htslib",
        "purl": "pkg:deb/ubuntu/htslib@1.13+ds-2build1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
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          ],
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      ],
      "versions": [
        "1.13+ds-2",
        "1.13+ds-2build1"
      ]
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      "ecosystem_specific": {
        "binaries": [
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            "binary_name": "htslib-test",
            "binary_version": "1.19+ds-1.1build3"
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            "binary_name": "libhts3t64",
            "binary_version": "1.19+ds-1.1build3"
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          {
            "binary_name": "tabix",
            "binary_version": "1.19+ds-1.1build3"
          }
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      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
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      },
      "ranges": [
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          "events": [
            {
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        "1.18+ds-1",
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          {
            "binary_name": "tabix",
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          }
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      "package": {
        "ecosystem": "Ubuntu:26.10",
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      },
      "ranges": [
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        "1.22.1+ds2-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "htslib-test",
            "binary_version": "1.22.1+ds2-1"
          },
          {
            "binary_name": "libhts3t64",
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          },
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            "binary_version": "1.22.1+ds2-1"
          }
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      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "htslib",
        "purl": "pkg:deb/ubuntu/htslib@1.22.1+ds2-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
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            }
          ],
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        }
      ],
      "versions": [
        "1.21+ds-1",
        "1.22.1+ds2-1"
      ]
    }
  ],
  "aliases": [],
  "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.",
  "id": "UBUNTU-CVE-2026-116742",
  "modified": "2026-10-28T17:50:38Z",
  "published": "2026-10-26T22:16:00Z",
  "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"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-116742"
  ]
}

CVE-2026-116742 (GCVE-0-2026-116742)

Vulnerability from cvelistv5 – Published: 2026-10-26 21:52 – Updated: 2026-10-27 14:16

Title

HTSlib through 1.24 Heap Out-of-Bounds Write via Truncated .gzi Index Count

Summary

Severity

4.8 (Medium)


                        
                          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

4.4 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-27 13:42 UTC

CWE

CWE-197 - Numeric Truncation Error

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7402 records in the last 180 days details

References

7 references

URL	Tags
https://github.com/samtools/htslib/pull/2057	issue-trackingpatch
https://github.com/samtools/htslib/commit/18dddf0…	patch
https://github.com/samtools/htslib	product
https://github.com/samtools/htslib/blob/1.24/bgzf…	technical-description
https://hackmd.io/@haindpwn/htslib-bgzf-gzi-int-t…	third-party-advisory
https://github.com/samtools/htslib/issues/2113	issue-tracking
https://www.vulncheck.com/advisories/htslib-throu…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
samtools	htslib	Affected: 0 , ≤ 1.24 (custom) cpe:2.3:a:htslib:htslib::::::::

Date Public

2026-07-31 00:00

Credits

HaiND from the Post and Telecommunication Institute of Technology daviesrob

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
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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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

UBUNTU-CVE-2026-116742 (CVE-2026-116742)

CVE-2026-116742 (GCVE-0-2026-116742)

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Related by attack behaviour