CVE-2026-31971

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Source

https://cve.org/CVERecord?id=CVE-2026-31971

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31971.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-31971

Aliases

GHSA-jvx4-4wq7-6fmh

Downstream

DEBIAN-CVE-2026-31971

UBUNTU-CVE-2026-31971

Published

2026-03-18T19:55:20.379Z

Modified

2026-04-10T05:42:53.846946Z

Severity

7.1 (High) CVSS_V4 - 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 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. When reading data encoded using the BYTE_ARRAY_LEN method, the cram_byte_array_len_decode() failed to validate that the amount of data being unpacked matched the size of the output buffer where it was to be stored. Depending on the data series being read, this could result either in a heap or a stack overflow with attacker-controlled bytes. 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-2026-31971.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-121",
        "CWE-122",
        "CWE-1284",
        "CWE-787"
    ]
}

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-2026-31971.json"