CVE-2026-8855

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-05-26. the CNA's CVSS baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:ibm, epss, ghsa
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 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
8.1
EG Score
8.1(medium)
EPSS
36.8%
KEV
Not listed

Published

May 26, 2026

Last Modified

May 28, 2026

Advisory Details (1)

Auto-updated Jun 4, 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 / 43× 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.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8855?
CVE-2026-8855 is a high 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 May 28, 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 36.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8855?
CVE-2026-8855 has a CVSS v4.0 base score of 8.1 (CNA self-assessment; NVD's own analysis pending).
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.

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