What’s Vulnerable › Vulnerabilities

CVE-2021-3402

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-14 · updated 2026-06-17
• Weakness: CWE-190

Description

An integer overflow and several buffer overflow reads in libyara/modules/macho/macho.c in YARA v4.0.3 and earlier could allow an attacker to either cause denial of service or information disclosure via a malicious Mach-O file. Affects all versions before libyara 4.0.4

Affected products

• Fedoraproject Fedora: 33, 34
• Yara Object: before 4.0.4 — fixed in 4.0.4

How to fix

Upgrade to a fixed version: Yara Object 4.0.4. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1930175
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FKNXSH5ERG6NELTXCYVJLUPJJJ2TNEBD/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XXM224OLGI6KAOROLDPPGGCZ2OQVQ6HH/
• https://www.openwall.com/lists/oss-security/2021/01/29/2
• https://www.x41-dsec.de/lab/advisories/x41-2021-001-yara/
• https://bugzilla.redhat.com/show_bug.cgi?id=1930175
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FKNXSH5ERG6NELTXCYVJLUPJJJ2TNEBD/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XXM224OLGI6KAOROLDPPGGCZ2OQVQ6HH/
• https://www.openwall.com/lists/oss-security/2021/01/29/2
• https://www.x41-dsec.de/lab/advisories/x41-2021-001-yara/

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