CVEvulnerability
CVE-2026-116742
4.8 MEDIUM
Official page ↗
- Status
- Deferred
- Published
- 2026-10-26
- Last modified
- 2026-10-27
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 4.8 MEDIUM — CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/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
- CVSS 3.1 ([email protected])
- 4.4 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
- Weaknesses
- CWE-197
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.
Related
Weakness · CWE (1)
- CWE-197 Numeric Truncation Error weakness
References
- https://github.com/samtools/htslib github.com
- https://github.com/samtools/htslib/blob/1.24/bgzf.c#L2504 github.com
- https://github.com/samtools/htslib/commit/18dddf02bb2c0053b32acec427723555a24b2873 github.com
- https://github.com/samtools/htslib/issues/2113 github.com
- https://github.com/samtools/htslib/pull/2057 github.com
- https://hackmd.io/@haindpwn/htslib-bgzf-gzi-int-truncation-oob hackmd.io
- https://www.vulncheck.com/advisories/htslib-through-1.24-heap-out-of-bounds-write-via-truncated-gzi-index-count www.vulncheck.com