CVE-2018-19974

MEDIUMNVD 5.5

5.5

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).

CVSS v3: 5.5
EG Score: —
EPSS: 48.7%
KEV: Not listed

Published

December 17, 2018

Last Modified

November 21, 2024

References (8)

cve@mitrehttps://bnbdr.github.io/posts/extracheese/
cve@mitrehttps://github.com/VirusTotal/yara/issues/999
cve@mitrehttps://github.com/bnbdr/swisscheese/
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DFFXDAMP6GJ337LIOTVF5I4T6QGMN3ZR/
af854a3a-2127-422b-91ae-364da2661108https://bnbdr.github.io/posts/extracheese/
af854a3a-2127-422b-91ae-364da2661108https://github.com/VirusTotal/yara/issues/999
af854a3a-2127-422b-91ae-364da2661108https://github.com/bnbdr/swisscheese/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DFFXDAMP6GJ337LIOTVF5I4T6QGMN3ZR/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-908Use of Uninitialized Resource

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:41 UTCOSV refresh
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2018-19974?

CVE-2018-19974 is a medium vulnerability published on December 17, 2018. 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).

When was CVE-2018-19974 disclosed?

CVE-2018-19974 was first published in the National Vulnerability Database on December 17, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-19974 actively exploited?

CVE-2018-19974 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 48.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-19974?

CVE-2018-19974 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2018-19974?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-19974, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2018-19974

📅 Published

🔄 Last Modified

🔗 References (8)