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.
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Affected Vendors & Products
Advisories
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Fixes
Solution
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Workaround
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References
History
Tue, 27 Oct 2026 04:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | HTSlib through 1.24 Heap Out-of-Bounds Write via Truncated .gzi Index Count | |
| First Time appeared |
Htslib
Htslib htslib |
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| Weaknesses | CWE-197 | |
| CPEs | cpe:2.3:a:htslib:htslib:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Htslib
Htslib htslib |
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| References |
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| Metrics |
cvssV3_1
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Projects
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MITRE
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-10-26T21:52:41.511Z
Reserved: 2026-10-26T20:23:36.636Z
Link: CVE-2026-116742
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-10-26T22:16:58.680
Modified: 2026-10-26T22:16:58.680
Link: CVE-2026-116742
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses