PT-2026-26145 · Htslib · Htslib

Highdaviesrob · Published 2026-01-01 · Updated 2026-03-19 · CVE-2026-31969

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 reading and writing bioinformatics file formats. A heap buffer overflow can occur when reading data encoded using the BYTE ARRAY STOP method due to an out-by-one error in the cram byte array stop decode char() function. This error allows a single attacker-controlled byte to be written beyond the allocated heap space. Exploitation of this issue could lead to program crashes, data corruption, or potentially arbitrary code execution if a specially crafted file is opened.

Recommendations Update HTSlib to version 1.23.1 or later. Update HTSlib to version 1.22.2 or later. Update HTSlib to version 1.21.1 or later.

Exploit

Fix

Memory Corruption

Heap Based Buffer Overflow

Weakness Enumeration

CWE-787

CWE-122

Related Identifiers

CVE-2026-31969

GHSA-Q4CJ-F4H5-FQGC

Affected Products

Htslib

References · 13

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31969.json · Exploit
• https://github.com/samtools/htslib/security/advisories/GHSA-q4cj-f4h5-fqgc · Vendor Advisory
• https://github.com/samtools/htslib/commit/88cdf69e4b83bb550ab4f6f7134892c2ad1978f4 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-31969 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-31969 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31969 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31969 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31969 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-31969 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31969 · Vendor Advisory
• https://twitter.com/NewsNerdie/status/2034631546112442809 · Twitter Post
• https://twitter.com/CVEnew/status/2034365231011610841 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2034439684416303466 · Twitter Post