CVE-2026-8646

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 55% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

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

IBM WebSphere Application Server 9.0 and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are vulnerable to HTTP request smuggling. A remote attacker could smuggle a specially crafted request to the application server thereby allowing the attacker to bypass security controls, spoof identity, escalate privilege, and expose sensitive information.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

June 22, 2026

Last Modified

June 24, 2026

Advisory Details (1)

Auto-updated Aug 1, 2026
No patch confirmed yet.
generic

Security Bulletin: IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities (CVE-2026-8646, CVE-2026-9320, CVE-2026-9071)

https://www.ibm.com/support/pages/node/7276579

Vendor Advisories for CVE-2026-8646(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 37× in last 7d / 204× 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 304 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-8646?
CVE-2026-8646 is a critical vulnerability published on June 22, 2026. IBM WebSphere Application Server 9.0 and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are vulnerable to HTTP request smuggling. A remote attacker could smuggle a specially crafted request to the application server thereby allowing the attacker to bypass security…
When was CVE-2026-8646 disclosed?
CVE-2026-8646 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8646 actively exploited?
CVE-2026-8646 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.5% of all scored CVEs.
What is the CVSS score of CVE-2026-8646?
CVE-2026-8646 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-8646?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8646, 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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