PT-2026-26147 · Htslib · Htslib

Jkbonfield · Published 2026-01-01 · Updated 2026-03-18 · CVE-2026-31971

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions HTSlib versions prior to 1.23.1 HTSlib version 1.22.2 HTSlib version 1.21.1

Description HTSlib is a library used for handling bioinformatics file formats. A flaw exists in the cram byte array len decode() function when processing data encoded with the BYTE ARRAY LEN method. This function does not properly validate the size of the unpacked data against the allocated output buffer, potentially leading to a heap or stack overflow. Exploitation of this issue, through a crafted file, could result in program crashes, data corruption, or potentially arbitrary code execution.

Recommendations Update HTSlib to version 1.23.1 or later.

Exploit

Fix

Heap Based Buffer Overflow

Stack Overflow

Memory Corruption

Weakness Enumeration

CWE-122

CWE-121

CWE-1284

CWE-787

Related Identifiers

CVE-2026-31971

GHSA-JVX4-4WQ7-6FMH

Affected Products

Htslib

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31971.json · Exploit
• https://github.com/samtools/htslib/commit/01cd003b46fa2ebea4d9be5475b11217eb4c11be · Patch
• https://github.com/samtools/htslib/security/advisories/GHSA-jvx4-4wq7-6fmh · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31971 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31971 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-31971 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31971 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31971 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31971 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-31971 · Vendor Advisory
• https://twitter.com/CVEnew/status/2034365228780229004 · Twitter Post