CVE-2018-19974

5.5 mediumEPSS 1.3%

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).

Severity

CVSS 3.0

5.5 medium

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS: 1.3% chance of exploitation in the next 30 days; higher than 69% of CVEs (scores of 2026-10-31)
CWE: CWE-908
Published: 2018-12-17
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

virustotal:yara

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/

Check your stack JSON