What’s Vulnerable › Vulnerabilities

CVE-2018-19974

• Severity: medium (CVSS 5.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-12-17 · updated 2026-06-17
• Weakness: CWE-908

Description

In YARA 3.8.1, bytecode in a specially crafted compiled rule can read uninitialized data from VM scratch memory in libyara/exec.c. This can allow attackers to discover addresses in the real stack (not the YARA virtual stack).

Affected products

• Yara Object: 3.8.1

References

• https://bnbdr.github.io/posts/extracheese/
• https://github.com/VirusTotal/yara/issues/999
• https://github.com/bnbdr/swisscheese/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DFFXDAMP6GJ337LIOTVF5I4T6QGMN3ZR/
• https://bnbdr.github.io/posts/extracheese/
• https://github.com/VirusTotal/yara/issues/999
• https://github.com/bnbdr/swisscheese/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DFFXDAMP6GJ337LIOTVF5I4T6QGMN3ZR/

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