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CVE-2026-116742— HTSlib through 1.24 Heap Out-of-Bounds Write via Truncated .gzi Index Count

Quick assessment

Affected
samtools htslib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HTSlib 1.24 及更早版本在 bgzf.c 的 bgzf_index_load_hfile() 函数中存在堆越界写入和读取漏洞。攻击者可通过提供精心构造的 .gzi 索引条目计数来破坏堆内存。当该计数值为 0xFFFFFFFF 时，noffs 会被截断为零，导致在 malloc(0) 分配的缓冲区之后进行写入，并在 bgzf_useek() 中执行 offs[-1] 读取，从而引发堆内存损坏或导致 samtools、bcftools 等工具崩溃。

CVSS 4.4 · Medium EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
samtools htslib ≤ 1.24 affected
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I. Basic Information for CVE-2026-116742

Vulnerability Information
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Vulnerability Title
HTSlib through 1.24 Heap Out-of-Bounds Write via Truncated .gzi Index Count
Source: CVE Program / CVE List V5
Vulnerability Description
HTSlib through 1.24 contains a heap out-of-bounds write and read vulnerability in bgzf_index_load_hfile() in bgzf.c that allows attackers to corrupt heap memory by supplying a crafted .gzi index entry count. A count of 0xFFFFFFFF truncates noffs to zero, causing writes past a malloc(0) buffer and an offs[-1] read in bgzf_useek(), resulting in heap corruption or crashes in tools like samtools and bcftools.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
数值截断错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
samtools htslib 0 ~ 1.24 -

II. Public POCs for CVE-2026-116742

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-116742

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Patches & Fixes for CVE-2026-116742 (2)

Vendor Advisories for CVE-2026-116742 (1)

Vendor Pages for CVE-2026-116742 (1)

Other References for CVE-2026-116742 (1)

IV. Related Vulnerabilities

Same product: htslib
Same vendor: samtools
Same weakness: CWE-197