What’s Vulnerable › Vulnerabilities

CVE-2020-36403

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-01 · updated 2026-06-17
• Weakness: CWE-787

Description

HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).

Affected products

• samtools htslib: through 1.10.2

References

• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24097
• https://github.com/google/oss-fuzz-vulns/blob/main/vulns/htslib/OSV-2020-955.yaml
• https://github.com/samtools/htslib/commit/dcd4b7304941a8832fba2d0fc4c1e716e7a4e72c
• https://github.com/samtools/htslib/pull/1447
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24097
• https://github.com/google/oss-fuzz-vulns/blob/main/vulns/htslib/OSV-2020-955.yaml
• https://github.com/samtools/htslib/commit/dcd4b7304941a8832fba2d0fc4c1e716e7a4e72c
• https://github.com/samtools/htslib/pull/1447

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