CVE-2026-31970 is a heap buffer overflow vulnerability in HTSlib, a library used for bioinformatics file formats, affecting versions prior to 1.23.1, 1.22.2, and 1.21.1. This flaw arises from an integer overflow in the GZI loading function, which can be triggered when a user opens a specially crafted GZI index file. Rated 8.1 HIGH (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H), successful exploitation can lead to program crashes, data corruption, and potentially arbitrary code execution. There is currently no evidence of active exploitation, no public exploit code available, and minimal community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.21CPE matchmatch criteria | cpe:2.3:a:htslib:htslib:*:*:*:*:*:*:*:* | ||
>= 1.22, < 1.22.2CPE matchmatch criteria | cpe:2.3:a:htslib:htslib:*:*:*:*:*:*:*:* | ||
1.23CPE matchmatch criteria | cpe:2.3:a:htslib:htslib:1.23:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.
Remediation records are not available for this CVE.