CVE-2026-116742
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
CVSS
4.4
Medium
EPSS
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KEV
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Exploit Today
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0-100
Published: Oct 26, 2026 · Last modified: Oct 26, 2026 · CWE-197
Not enough EPSS history yet.
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.
- github.comhttps://github.com/samtools/htslib
- github.comhttps://github.com/samtools/htslib/blob/1.24/bgzf.c#L2504
- github.comhttps://github.com/samtools/htslib/commit/18dddf02bb2c0053b32acec427723555a24b2873
- github.comhttps://github.com/samtools/htslib/issues/2113
- github.comhttps://github.com/samtools/htslib/pull/2057
- hackmd.iohttps://hackmd.io/@haindpwn/htslib-bgzf-gzi-int-truncation-oob
- www.vulncheck.comhttps://www.vulncheck.com/advisories/htslib-through-1.24-heap-out-of-bounds-write-via-truncated-gzi-index-count
CVECVSSEPSSKEVRExploitTitleMod.
CVE-2026-1160123.6 LOW11.1%
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The specific flaw exists within the rlottie library. The issue results from the lack of proper validation of user-supplied data, which can result in a write before the start of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-30207.11d