CVE-2026-18871

HIGHPre-NVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-08-19. A secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.3EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.3Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, and FW1060.00 through FW1060.80 is affected by a vulnerability in host firmware configuration parsing. An attacker with authenticated service-level access to the service processor can write specially crafted configuration data, causing the host firmware boot stack to crash with possible memory corruption during system initialisation, resulting in an integrity and availability impact to the managed system.

CVSS v3
7.3
EG Score
7.3HIGHmedium confidence
EG Risk
33
EG Risk 33/100CISA 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
Severity73% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). 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

August 19, 2026

Last Modified

August 25, 2026

Advisory Details (1)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

Security Bulletin: This Power System update is being released to address CVE-2026-18871

https://www.ibm.com/support/pages/node/7283238

Vendor Advisories for CVE-2026-18871(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 88× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 150 total refreshes for this CVE.

  1. 2026-10-05 10:33 UTCEG score recompute
  2. 2026-10-05 10:32 UTCGHSA enrichment
  3. 2026-10-04 23:21 UTCEPSS rescore
  4. 2026-10-04 21:24 UTCGHSA enrichment
  5. 2026-10-04 06:25 UTCGHSA enrichment
  6. 2026-10-03 17:19 UTCEG score recompute
  7. 2026-10-03 17:19 UTCGHSA enrichment
  8. 2026-10-03 04:12 UTCEG score recompute
  9. 2026-10-03 04:12 UTCGHSA enrichment
  10. 2026-10-02 14:51 UTCGHSA enrichment
  11. 2026-10-02 01:21 UTCEG score recompute
  12. 2026-10-02 01:21 UTCGHSA enrichment
  13. 2026-10-01 19:49 UTCEPSS rescore
  14. 2026-10-01 10:51 UTCGHSA enrichment
  15. 2026-09-30 21:45 UTCEG score recompute
  16. 2026-09-30 21:45 UTCGHSA enrichment
  17. 2026-09-30 15:02 UTCEPSS rescore
  18. 2026-09-30 08:39 UTCEG score recompute
  19. 2026-09-30 08:39 UTCGHSA enrichment
  20. 2026-09-29 15:20 UTCEPSS rescore
  21. 2026-09-28 21:41 UTCEG score recompute
  22. 2026-09-28 21:41 UTCGHSA enrichment
  23. 2026-09-28 13:51 UTCEPSS rescore
  24. 2026-09-28 08:17 UTCGHSA enrichment
  25. 2026-09-27 19:11 UTCEG score recompute
Show 75 more
  1. 2026-09-27 19:11 UTCGHSA enrichment
  2. 2026-09-27 13:47 UTCEPSS rescore
  3. 2026-09-27 06:05 UTCEG score recompute
  4. 2026-09-27 06:05 UTCGHSA enrichment
  5. 2026-09-26 15:58 UTCEPSS rescore
  6. 2026-09-25 01:41 UTCEG score recompute
  7. 2026-09-25 01:41 UTCGHSA enrichment
  8. 2026-09-24 12:35 UTCGHSA enrichment
  9. 2026-09-23 23:29 UTCGHSA enrichment
  10. 2026-09-23 10:16 UTCGHSA enrichment
  11. 2026-09-22 21:10 UTCEG score recompute
  12. 2026-09-22 21:10 UTCGHSA enrichment
  13. 2026-09-22 08:04 UTCEG score recompute
  14. 2026-09-22 08:04 UTCGHSA enrichment
  15. 2026-09-21 18:58 UTCGHSA enrichment
  16. 2026-09-21 05:52 UTCGHSA enrichment
  17. 2026-09-20 15:53 UTCGHSA enrichment
  18. 2026-09-20 02:45 UTCGHSA enrichment
  19. 2026-09-19 13:38 UTCGHSA enrichment
  20. 2026-09-19 00:32 UTCEG score recompute
  21. 2026-09-19 00:31 UTCGHSA enrichment
  22. 2026-09-18 11:23 UTCGHSA enrichment
  23. 2026-09-17 22:17 UTCEG score recompute
  24. 2026-09-17 22:17 UTCGHSA enrichment
  25. 2026-09-17 09:11 UTCGHSA enrichment
  26. 2026-09-16 20:05 UTCEG score recompute
  27. 2026-09-16 20:05 UTCGHSA enrichment
  28. 2026-09-16 14:07 UTCEPSS rescore
  29. 2026-09-16 05:14 UTCEPSS rescore
  30. 2026-09-16 05:11 UTCGHSA enrichment
  31. 2026-09-15 16:05 UTCEG score recompute
  32. 2026-09-15 16:05 UTCGHSA enrichment
  33. 2026-09-15 02:58 UTCGHSA enrichment
  34. 2026-09-14 13:50 UTCGHSA enrichment
  35. 2026-09-14 00:44 UTCEG score recompute
  36. 2026-09-14 00:44 UTCGHSA enrichment
  37. 2026-09-13 16:46 UTCEPSS rescore
  38. 2026-09-13 11:38 UTCGHSA enrichment
  39. 2026-09-12 22:32 UTCEG score recompute
  40. 2026-09-12 22:32 UTCGHSA enrichment
  41. 2026-09-12 15:00 UTCEPSS rescore
  42. 2026-09-12 09:25 UTCGHSA enrichment
  43. 2026-09-11 20:16 UTCEG score recompute
  44. 2026-09-11 20:16 UTCGHSA enrichment
  45. 2026-09-11 14:52 UTCEPSS rescore
  46. 2026-09-11 09:36 UTCEPSS rescore
  47. 2026-09-11 06:57 UTCGHSA enrichment
  48. 2026-09-10 17:51 UTCEG score recompute
  49. 2026-09-10 17:51 UTCGHSA enrichment
  50. 2026-09-10 09:34 UTCEPSS rescore
  51. 2026-09-10 04:44 UTCGHSA enrichment
  52. 2026-09-09 15:38 UTCGHSA enrichment
  53. 2026-09-09 02:31 UTCEG score recompute
  54. 2026-09-09 02:31 UTCGHSA enrichment
  55. 2026-09-08 22:00 UTCEPSS rescore
  56. 2026-09-08 04:44 UTCGHSA enrichment
  57. 2026-09-07 15:38 UTCGHSA enrichment
  58. 2026-09-06 23:22 UTCEG score recompute
  59. 2026-09-06 23:22 UTCGHSA enrichment
  60. 2026-09-06 13:47 UTCEPSS rescore
  61. 2026-09-06 10:14 UTCGHSA enrichment
  62. 2026-09-05 21:04 UTCEG score recompute
  63. 2026-09-05 21:04 UTCGHSA enrichment
  64. 2026-09-05 07:58 UTCGHSA enrichment
  65. 2026-09-04 18:51 UTCEG score recompute
  66. 2026-09-04 18:51 UTCGHSA enrichment
  67. 2026-09-04 05:18 UTCEG score recompute
  68. 2026-09-04 05:18 UTCGHSA enrichment
  69. 2026-09-04 05:06 UTCEPSS rescore
  70. 2026-09-03 16:11 UTCGHSA enrichment
  71. 2026-09-03 03:02 UTCGHSA enrichment
  72. 2026-09-02 13:54 UTCGHSA enrichment
  73. 2026-09-02 00:46 UTCEG score recompute
  74. 2026-09-02 00:46 UTCGHSA enrichment
  75. 2026-09-01 13:53 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18871?
CVE-2026-18871 is a high vulnerability published on August 19, 2026. IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, and FW1060.00 through FW1060.80 is affected by a vulnerability in host firmware configuration parsing. An attacker with authenticated service-level access to the service processor can write specially crafted configuration data, causing…
When was CVE-2026-18871 disclosed?
CVE-2026-18871 was first published on August 19, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18871 actively exploited?
CVE-2026-18871 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18871?
CVE-2026-18871 has a CVSS base score of 7.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18871?
No fix for CVE-2026-18871 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-18871 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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