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 53% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
9.1EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.1Exploit: 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 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
9.1CRITICALmedium confidence
EG Risk
46
EG Risk 46/100

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%
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
Not listed

Published

June 22, 2026

Last Modified

June 24, 2026

Advisory Details (1)

Auto-updated Sep 16, 2026
No fix on record 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 7× in last 7d / 34× 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 353 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 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 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-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?
No fix for CVE-2026-8646 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-2026-8646 are linked in the Vendor Advisories panel on this page.

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