CVE-2026-16877

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-19. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote authenticated attacker to execute arbitrary code due to a stack-based buffer overflow.

CVSS v3
8.8
EG Score
8.8HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.8%
EPSS %ILE
53rd
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 20, 2026

Advisory Details (1)

Auto-updated Aug 19, 2026
Patch available.
generic

Security Bulletin: Vulnerabilities in IBM AIX and PowerVM VIOS

https://www.ibm.com/support/pages/node/7283858

Vendor Advisories for CVE-2026-16877(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 26× in last 7d / 104× 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 177 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-16877?
CVE-2026-16877 is a high vulnerability published on August 19, 2026. IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote authenticated attacker to execute arbitrary code due to a stack-based buffer overflow.
When was CVE-2026-16877 disclosed?
CVE-2026-16877 was first published on August 19, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16877 actively exploited?
CVE-2026-16877 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (53rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-16877?
CVE-2026-16877 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-16877?
A fix for CVE-2026-16877 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-16877 are linked in the Vendor Advisories panel on this page.

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