PT-2026-26143 · Htslib · Htslib

Aviesrob · Published 2026-01-01 · Updated 2026-03-18 · CVE-2026-31967

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions HTSlib versions 1.21.1 through 1.23.1

Description HTSlib is a library used for handling bioinformatics file formats, specifically CRAM, a compressed DNA sequence alignment data format. A flaw exists in the cram decode slice() function during CRAM record processing where the mate reference ID field is not properly validated. This lack of validation can lead to out-of-bounds array reads when converting data to SAM format. If the resulting array value is a valid pointer, it may be interpreted as a string, potentially leading to information disclosure regarding program state or a program crash due to invalid memory access.

Recommendations Update HTSlib to a version after 1.23.1.

Exploit

Fix

Improper Validation of Array Index

Out of bounds Read

Weakness Enumeration

CWE-129

CWE-125

Related Identifiers

CVE-2026-31967

GHSA-33X5-C6VJ-8F2W

Affected Products

Htslib

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31967.json · Exploit
• https://github.com/samtools/htslib/commit/9cefb46453ad471e933b8212d4f45920524d3357 · Patch
• https://github.com/samtools/htslib/security/advisories/GHSA-33x5-c6vj-8f2w · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31967 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-31967 · Security Note
• https://ubuntu.com/security/CVE-2026-31967 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-31967 · Security Note
• https://osv.dev/vulnerability/CVE-2026-31967 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31967 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31967 · Vendor Advisory
• https://twitter.com/CVEnew/status/2034365234652323914 · Twitter Post