CVE-2026-31968

See a problem?
Please try reporting it to the source first.

Source

https://cve.org/CVERecord?id=CVE-2026-31968

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31968.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-31968

Aliases

GHSA-cgcm-c9r2-p57j

Downstream

DEBIAN-CVE-2026-31968

UBUNTU-CVE-2026-31968

Published

2026-03-18T19:38:11.370Z

Modified

2026-04-10T05:42:53.858165Z

Severity

8.8 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N CVSS Calculator

Summary

HTSlib CRAM decoder vulnerable to buffer overflow

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. For the VARINT and CONST encodings, incomplete validation of the context in which the encodings were used could result in up to eight bytes being written beyond the end of a heap allocation, or up to eight bytes being written to the location of a one byte variable on the stack, possibly causing the values to adjacent variables to change unexpectedly. Depending on the data stream this could result either in a heap buffer overflow or a stack overflow. If a user opens a file crafted to exploit this issue it could lead to the program crashing, overwriting of data structures on the heap or stack in ways not expected by the program, or changing the control flow of 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.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31968.json",
    "cwe_ids": [
        "CWE-121",
        "CWE-122",
        "CWE-787",
        "CWE-843"
    ],
    "cna_assigner": "GitHub_M"
}

References

Affected packages

Git / github.com/samtools/htslib

Affected ranges

Type

GIT

Repo

https://github.com/samtools/htslib

Events

Introduced

Fixed

4d33bcb31831165a4d0dbf85114ff4085c0baf1f

Last affected

86e74e065e39749d25636f8454773d9d898c5eb3

Database specific

{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.21.1"
        },
        {
            "last_affected": "= 1.23"
        }
    ]
}

Type

GIT

Repo

https://github.com/samtools/htslib

Events

Introduced

36f20e7c1f0bd4d094c4e91836f757caef16475a

Fixed

45034a719156b68705b9bbfba2156bfc2b4c6749

Database specific

{
    "versions": [
        {
            "introduced": "1.22"
        },
        {
            "fixed": "1.22.2"
        }
    ]
}

Affected versions

0.*

0.2.0-rc10

0.2.0-rc11

0.2.0-rc12

0.2.0-rc2

0.2.0-rc3

0.2.0-rc4

0.2.0-rc5

0.2.0-rc6

0.2.0-rc7

0.2.0-rc8

0.2.0-rc9

1.*

1.0

1.1

1.10

1.10.1

1.10.2

1.11

1.11.0

1.12

1.13

1.14

1.15

1.15.1

1.16

1.17

1.18

1.19

1.19.1

1.2

1.2.1

1.20

1.21

1.22

1.22.1

1.23

1.3

1.3.1

1.3.2

1.4

1.4.1

1.5

1.6

1.7

1.8

1.9

Other

stable1

stable2

vcf-direct-final

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31968.json"