CVE-2026-81624

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-31. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

August 31, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated Aug 31, 2026
Patch available. Sources: redhat.
redhat

2524868 – (CVE-2026-81624) CVE-2026-81624 undertow-core: undertow: WebSocketContainer defaults for buffers and timeouts are infinite

https://bugzilla.redhat.com/show_bug.cgi?id=2524868
redhat Patch Available

CVE-2026-81624 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-81624

Vendor Advisories for CVE-2026-81624(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFixed inDependents
undertow1.3.11-1 ... 2.3.8-2 (56 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 28× in last 7d / 90× 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. 2026-09-21 01:59 UTCEG score recompute
  2. 2026-09-21 01:59 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 14:57 UTCGHSA enrichment
  5. 2026-09-20 03:56 UTCGHSA enrichment
  6. 2026-09-19 16:54 UTCEG score recompute
  7. 2026-09-19 16:54 UTCGHSA enrichment
  8. 2026-09-19 05:52 UTCEG score recompute
  9. 2026-09-19 05:52 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 18:51 UTCGHSA enrichment
  12. 2026-09-18 07:49 UTCGHSA enrichment
  13. 2026-09-17 20:48 UTCEG score recompute
  14. 2026-09-17 20:48 UTCGHSA enrichment
  15. 2026-09-17 07:14 UTCGHSA enrichment
  16. 2026-09-16 20:10 UTCEG score recompute
  17. 2026-09-16 20:10 UTCGHSA enrichment
  18. 2026-09-16 14:08 UTCEPSS rescore
  19. 2026-09-16 09:08 UTCEG score recompute
  20. 2026-09-16 09:08 UTCGHSA enrichment
  21. 2026-09-16 05:15 UTCEPSS rescore
  22. 2026-09-15 20:58 UTCGHSA enrichment
  23. 2026-09-15 09:56 UTCEG score recompute
  24. 2026-09-15 09:56 UTCGHSA enrichment
  25. 2026-09-15 03:12 UTCEPSS rescore
Show 65 more
  1. 2026-09-15 03:12 UTCEPSS rescore
  2. 2026-09-14 22:54 UTCGHSA enrichment
  3. 2026-09-14 11:52 UTCGHSA enrichment
  4. 2026-09-14 00:51 UTCEG score recompute
  5. 2026-09-14 00:51 UTCGHSA enrichment
  6. 2026-09-13 13:49 UTCGHSA enrichment
  7. 2026-09-13 02:48 UTCGHSA enrichment
  8. 2026-09-12 15:46 UTCEG score recompute
  9. 2026-09-12 15:46 UTCGHSA enrichment
  10. 2026-09-12 04:44 UTCGHSA enrichment
  11. 2026-09-11 17:42 UTCEG score recompute
  12. 2026-09-11 17:42 UTCGHSA enrichment
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 06:40 UTCGHSA enrichment
  16. 2026-09-10 19:38 UTCEG score recompute
  17. 2026-09-10 19:38 UTCGHSA enrichment
  18. 2026-09-10 08:37 UTCEG score recompute
  19. 2026-09-10 08:36 UTCGHSA enrichment
  20. 2026-09-10 07:26 UTCEG score recompute
  21. 2026-09-10 07:26 UTCGHSA enrichment
  22. 2026-09-09 23:45 UTCGHSA enrichment
  23. 2026-09-09 10:32 UTCGHSA enrichment
  24. 2026-09-08 23:30 UTCEG score recompute
  25. 2026-09-08 23:30 UTCGHSA enrichment
  26. 2026-09-08 22:01 UTCEPSS rescore
  27. 2026-09-08 08:40 UTCGHSA enrichment
  28. 2026-09-07 21:29 UTCEG score recompute
  29. 2026-09-07 21:29 UTCGHSA enrichment
  30. 2026-09-07 10:28 UTCGHSA enrichment
  31. 2026-09-06 23:26 UTCEG score recompute
  32. 2026-09-06 23:26 UTCGHSA enrichment
  33. 2026-09-06 13:48 UTCEPSS rescore
  34. 2026-09-06 12:24 UTCGHSA enrichment
  35. 2026-09-06 01:23 UTCEG score recompute
  36. 2026-09-06 01:23 UTCGHSA enrichment
  37. 2026-09-05 15:31 UTCEPSS rescore
  38. 2026-09-05 14:21 UTCGHSA enrichment
  39. 2026-09-05 03:19 UTCGHSA enrichment
  40. 2026-09-04 16:17 UTCEG score recompute
  41. 2026-09-04 16:17 UTCGHSA enrichment
  42. 2026-09-04 05:16 UTCEG score recompute
  43. 2026-09-04 05:15 UTCGHSA enrichment
  44. 2026-09-04 05:07 UTCEPSS rescore
  45. 2026-09-03 18:11 UTCGHSA enrichment
  46. 2026-09-03 07:07 UTCGHSA enrichment
  47. 2026-09-02 20:04 UTCEG score recompute
  48. 2026-09-02 20:04 UTCGHSA enrichment
  49. 2026-09-02 14:12 UTCEPSS rescore
  50. 2026-09-02 08:11 UTCGHSA enrichment
  51. 2026-09-01 21:10 UTCGHSA enrichment
  52. 2026-09-01 15:43 UTCEG score recompute
  53. 2026-09-01 15:43 UTCGHSA enrichment
  54. 2026-09-01 15:13 UTCEG score recompute
  55. 2026-09-01 15:13 UTCGHSA enrichment
  56. 2026-09-01 13:54 UTCEPSS rescore
  57. 2026-09-01 07:54 UTCEG score recompute
  58. 2026-09-01 07:54 UTCGHSA enrichment
  59. 2026-09-01 04:40 UTCEPSS rescore
  60. 2026-09-01 04:40 UTCEPSS rescore
  61. 2026-08-31 20:48 UTCGHSA enrichment
  62. 2026-08-31 09:37 UTCEG score recompute
  63. 2026-08-31 09:37 UTCGHSA enrichment
  64. 2026-08-31 08:55 UTCEG score recompute
  65. 2026-08-31 08:52 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-81624?
CVE-2026-81624 is a high vulnerability published on August 31, 2026. Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a…
When was CVE-2026-81624 disclosed?
CVE-2026-81624 was first published in the National Vulnerability Database on August 31, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-81624 actively exploited?
CVE-2026-81624 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 73.4% of all scored CVEs.
What is the CVSS score of CVE-2026-81624?
CVE-2026-81624 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-81624?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-81624, 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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