CVE-2018-19974

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1.3%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
5.5MEDIUMmedium confidence
EG Risk
30
EG Risk 30/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation1% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.3%
EPSS %ILE
68th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

December 17, 2018

Last Modified

November 21, 2024

References (4)

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuyara-doc (3.4.0+dfsg-2ubuntu0.1~esm1) @ xenial2026-05-28ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
yara—
  • every version up to 3.8.1-2: fixed in 3.8.1-2
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
yara—
  • every version up to 3.8.1-2: fixed in 3.8.1-2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
yara—
  • every version up to 3.8.1-2: fixed in 3.8.1-2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
yara—
  • every version up to 3.8.1-2: fixed in 3.8.1-2
—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 25× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 88 of 160 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 12 repeat rows among the latest 100 are merged into the row they repeat. The 72 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-10 19:55 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  2. 2026-10-09 20:02 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  3. 2026-10-08 16:36 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  4. 2026-10-07 23:42 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  5. 2026-10-06 15:12 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  6. 2026-10-05 17:39 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  7. 2026-10-04 23:18 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  8. 2026-10-03 14:21 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  9. 2026-10-01 19:44 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  10. 2026-09-30 14:59 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  11. 2026-09-30 09:58 UTCEG score recompute
  12. 2026-09-28 15:12 UTCOSV refresh
  13. 2026-09-28 13:45 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  14. 2026-09-27 13:40 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  15. 2026-09-26 15:53 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  16. 2026-09-24 13:59 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  17. 2026-09-20 20:10 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  18. 2026-09-19 15:36 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  19. 2026-09-18 19:22 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  20. 2026-09-17 19:22 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  21. 2026-09-16 05:06 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  22. 2026-09-15 03:05 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  23. 2026-09-13 16:42 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  24. 2026-09-12 14:56 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  25. 2026-09-11 14:47 UTCEPSS rescoreEPSS 1.3% · 68th percentile
Show 63 more
  1. 2026-09-11 09:32 UTCEPSS rescoreEPSS 1.3% · 68th percentile
  2. 2026-09-08 20:04 UTCOSV refresh
  3. 2026-09-07 15:57 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  4. 2026-09-06 13:43 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  5. 2026-09-05 15:24 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
  6. 2026-09-04 13:56 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  7. 2026-09-04 05:02 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  8. 2026-09-02 14:07 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  9. 2026-09-01 13:49 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  10. 2026-09-01 03:32 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  11. 2026-08-28 21:36 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
  12. 2026-08-27 14:21 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  13. 2026-08-26 14:42 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  14. 2026-08-25 13:44 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  15. 2026-08-22 05:07 UTCOSV refresh
  16. 2026-08-21 23:45 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  17. 2026-08-20 22:51 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  18. 2026-08-19 17:00 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  19. 2026-08-18 13:44 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  20. 2026-08-17 13:43 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  21. 2026-08-16 14:51 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  22. 2026-08-16 02:10 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  23. 2026-08-15 01:26 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  24. 2026-08-13 21:56 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  25. 2026-08-12 13:46 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  26. 2026-08-09 13:43 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  27. 2026-08-08 16:32 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  28. 2026-08-07 16:23 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  29. 2026-08-06 13:42 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  30. 2026-08-06 08:10 UTCOSV refresh
  31. 2026-08-05 19:13 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  32. 2026-08-04 15:05 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  33. 2026-08-02 02:23 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  34. 2026-08-01 04:12 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  35. 2026-07-30 16:24 UTCEPSS rescoreEPSS 1.3% · 67th percentile
  36. 2026-07-30 01:27 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  37. 2026-07-28 15:32 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  38. 2026-07-26 14:51 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  39. 2026-07-25 14:14 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  40. 2026-07-24 14:14 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  41. 2026-07-23 14:15 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  42. 2026-07-23 01:35 UTCEG score recompute
  43. 2026-07-22 22:15 UTCEG score recompute
  44. 2026-07-22 14:05 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  45. 2026-07-21 15:22 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  46. 2026-07-21 01:17 UTCOSV refresh
  47. 2026-07-20 17:04 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  48. 2026-07-19 14:28 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  49. 2026-07-19 02:26 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  50. 2026-07-16 16:59 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  51. 2026-07-15 16:55 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  52. 2026-07-15 01:56 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  53. 2026-07-13 22:26 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  54. 2026-07-12 05:43 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  55. 2026-07-11 08:24 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  56. 2026-07-09 19:06 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  57. 2026-07-08 15:11 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  58. 2026-07-07 13:42 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  59. 2026-07-06 16:24 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  60. 2026-07-06 02:20 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  61. 2026-07-05 02:27 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  62. 2026-07-04 06:28 UTCEPSS rescoreEPSS 1.3% · 66th percentile
  63. 2026-07-03 20:26 UTCOSV refresh

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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 the CVE record for CVE-2018-19974 published?
The CVE record for CVE-2018-19974 was published on December 17, 2018. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 21, 2024; the record at its source may have been updated since.
Is CVE-2018-19974 actively exploited?
CVE-2018-19974 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.3% probability of exploitation in the next 30 days (68th percentile of EPSS-scored CVEs).
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?
A fix for CVE-2018-19974 is available: update to the fixed version the vendor names in its advisory.

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