CVE-2026-8855

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 62% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

IBM HTTP Server 8.5, and 9.0 is vulnerable to remote code execution and denial of service in configurations with TLS mutual authentication (client authentication).

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

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
Severity98% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

May 26, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Aug 29, 2026
No patch confirmed yet.
generic

Security Bulletin: IBM HTTP Server is affected by multiple vulnerabilities

https://www.ibm.com/support/pages/node/7274065

Vendor Advisories for CVE-2026-8855(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 7× in last 7d / 116× 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 251 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8855?
CVE-2026-8855 is a critical vulnerability published on May 26, 2026. IBM HTTP Server 8.5, and 9.0 is vulnerable to remote code execution and denial of service in configurations with TLS mutual authentication (client authentication).
When was CVE-2026-8855 disclosed?
CVE-2026-8855 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8855 actively exploited?
CVE-2026-8855 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.1% of all scored CVEs.
What is the CVSS score of CVE-2026-8855?
CVE-2026-8855 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-8855?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8855, 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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