CVE-2026-5680

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-27. 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.

A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-deflate negotiated. This could lead to excessive memory consumption due to the PerMessageDeflateFunction.largerBuffer() method using exponential doubling, resulting in a Denial of Service (DoS) for the affected application.

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
34%
KEV
Not listed

Published

August 27, 2026

Last Modified

September 9, 2026

Advisory Details (2)

Auto-updated Aug 27, 2026
Patch available. Sources: redhat.
redhat

Bug Access Denied

https://bugzilla.redhat.com/show_bug.cgi?id=2455350
redhat Patch Available

CVE-2026-5680 - 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-2026-5680

Vendor Advisories for CVE-2026-5680(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 / 108× 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 108 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-5680?
CVE-2026-5680 is a high vulnerability published on August 27, 2026. A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-deflate negotiated. This could lead to excessive memory consumption due to the PerMessageDeflateFunction.largerBuffer() method using exponential doubling,…
When was CVE-2026-5680 disclosed?
CVE-2026-5680 was first published in the National Vulnerability Database on August 27, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5680 actively exploited?
CVE-2026-5680 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 65.5% of all scored CVEs.
What is the CVSS score of CVE-2026-5680?
CVE-2026-5680 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-5680?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-5680, 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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