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CVE-2026-31962 - Vulnerability Analysis

HighCVSS: 8.8

Last Updated: March 19, 2026

HTSlib - Buffer Overflow

Published: March 18, 2026Updated: March 19, 2026Remote Exploitable

Overview

HTSlib contains a heap buffer overflow caused by improper handling of certain CRAM format records in cram_decode_seq(), letting attackers cause crashes or potentially execute arbitrary code, exploit requires opening a crafted file.

Severity & Score

Severity: High

CVSS Score: 8.8

Impact

Attackers can cause crashes or potentially execute arbitrary code by opening a crafted CRAM file.

Mitigation

Update to version 1.23.1, 1.22.2, 1.21.1 or later.

References

https://github.com/samtools/htslib/commit/d799b54c6401879187bba4741be83ff590ac73e3
https://github.com/samtools/htslib/security/advisories/GHSA-xxmp-v7h3-gpwp

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Details

CVE ID: CVE-2026-31962
Severity: High
CVSS Score: 8.8
Type: buffer_overflow
Status: confirmed

CWE

CWE-122

CVSS Metrics

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