CVE-2026-31963

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Source

https://cve.org/CVERecord?id=CVE-2026-31963

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31963.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-31963

Aliases

GHSA-qgqh-h2q9-7w3c

Downstream

DEBIAN-CVE-2026-31963

UBUNTU-CVE-2026-31963

Published

2026-03-18T18:22:58.440Z

Modified

2026-04-10T05:42:53.834911Z

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 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. As one method of removing redundant data, CRAM uses reference-based compression so that instead of storing the full sequence for each alignment record it stores a location in an external reference sequence along with a list of differences to the reference at that location as a sequence of "features". When decoding these features, an out-by-one error in a test for CRAM features that appear beyond the extent of the CRAM record sequence could result in an invalid write of one attacker-controlled byte beyond the end of a heap buffer. 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-129",
        "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31963.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-2026-31963.json"