CVE-2026-31962

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

Source

https://cve.org/CVERecord?id=CVE-2026-31962

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31962.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-31962

Aliases

GHSA-xxmp-v7h3-gpwp

Downstream

DEBIAN-CVE-2026-31962

UBUNTU-CVE-2026-31962

Published

2026-03-18T18:08:26.067Z

Modified

2026-04-10T05:42:53.854758Z

Severity

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

Summary

HTSlib CRAM reader has heap buffer overflow due to improper validation of input

Details

HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data. While most alignment records store DNA sequence and quality values, the format also allows them to omit this data in certain cases to save space. Due to some quirks of the CRAM format, it is necessary to handle these records carefully as they will actually store data that needs to be consumed and then discarded. Unfortunately the cram_decode_seq() did not handle this correctly in some cases. Where this happened it could result in reading a single byte from beyond the end of a heap allocation, followed by writing a single attacker-controlled byte to the same location. 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.

Database specific

{
    "cwe_ids": [
        "CWE-122",
        "CWE-125",
        "CWE-129",
        "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31962.json",
    "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-2026-31962.json"