CVE-2026-5680

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation1.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.1%
EPSS %ILE
64th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 27, 2026

Last Modified

October 13, 2026

Advisory Details (2)

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

Bug Access Denied

https://bugzilla.redhat.com/show_bug.cgi?id=2455350
Red HatMentions a patch (unverified)

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(5)

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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhateap8-xml-security-0:3.0.6-1.redhat_00001.1.el8eap2026-09-22redhat
redhateap8-xml-security-0:3.0.6-1.redhat_00001.1.el9eap2026-09-22redhat
redhateap8-xml-security-0:3.0.6-1.redhat_00001.1.el10eap2026-09-22redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
undertow1.3.11-1 ... 2.3.8-2 (56 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 28× in last 7d / 137× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 219 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 119 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 18:26 UTCEG score recompute
  2. 2026-10-13 18:26 UTCVendor advisory
  3. 2026-10-13 18:26 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  4. 2026-10-13 17:21 UTCEG score recompute
  5. 2026-10-13 17:21 UTCVendor advisory
  6. 2026-10-13 17:20 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  7. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  8. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  9. 2026-10-12 15:54 UTCEG score recompute
  10. 2026-10-11 19:38 UTCEG score recompute
  11. 2026-10-11 16:53 UTCEG score recompute
  12. 2026-10-11 14:15 UTCEG score recompute
  13. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  14. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  15. 2026-10-10 14:21 UTCVendor advisory
  16. 2026-10-10 14:21 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  17. 2026-10-10 01:53 UTCEG score recompute
  18. 2026-10-10 01:53 UTCVendor advisory
  19. 2026-10-10 01:53 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  20. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  21. 2026-10-09 03:04 UTCEG score recompute
  22. 2026-10-09 03:04 UTCVendor advisory
  23. 2026-10-09 03:04 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  24. 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  25. 2026-10-08 01:19 UTCEG score recompute
Show 75 more
  1. 2026-10-08 01:19 UTCVendor advisory
  2. 2026-10-08 01:18 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  3. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  4. 2026-10-07 09:07 UTCVendor advisory
  5. 2026-10-07 09:07 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  6. 2026-10-06 20:41 UTCEG score recompute
  7. 2026-10-06 20:41 UTCVendor advisory
  8. 2026-10-06 20:41 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  10. 2026-10-06 07:33 UTCEG score recompute
  11. 2026-10-06 07:33 UTCVendor advisory
  12. 2026-10-06 07:32 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  14. 2026-10-05 17:01 UTCVendor advisory
  15. 2026-10-05 17:01 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  16. 2026-10-05 04:36 UTCEG score recompute
  17. 2026-10-05 04:36 UTCVendor advisory
  18. 2026-10-05 04:36 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  20. 2026-10-04 16:04 UTCVendor advisory
  21. 2026-10-04 16:03 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  22. 2026-10-04 03:38 UTCVendor advisory
  23. 2026-10-04 03:38 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  24. 2026-10-03 15:13 UTCEG score recompute
  25. 2026-10-03 15:13 UTCVendor advisory
  26. 2026-10-03 15:13 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  27. 2026-10-03 14:26 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  28. 2026-10-02 21:37 UTCEG score recompute
  29. 2026-10-02 21:37 UTCVendor advisory
  30. 2026-10-02 21:37 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  31. 2026-10-02 17:56 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  32. 2026-10-02 09:12 UTCVendor advisory
  33. 2026-10-02 09:12 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  34. 2026-10-01 20:47 UTCEG score recompute
  35. 2026-10-01 20:47 UTCVendor advisory
  36. 2026-10-01 20:47 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  37. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  38. 2026-10-01 08:22 UTCVendor advisory
  39. 2026-10-01 08:22 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  40. 2026-09-30 19:54 UTCEG score recompute
  41. 2026-09-30 19:54 UTCVendor advisory
  42. 2026-09-30 19:54 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  43. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  44. 2026-09-30 04:59 UTCEG score recompute
  45. 2026-09-30 04:59 UTCVendor advisory
  46. 2026-09-30 04:59 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  47. 2026-09-29 12:16 UTCEG score recompute
  48. 2026-09-29 12:16 UTCVendor advisory
  49. 2026-09-29 12:16 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  50. 2026-09-28 21:15 UTCEG score recompute
  51. 2026-09-28 21:15 UTCVendor advisory
  52. 2026-09-28 21:15 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  53. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  54. 2026-09-28 08:01 UTCVendor advisory
  55. 2026-09-28 08:01 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  56. 2026-09-27 19:33 UTCEG score recompute
  57. 2026-09-27 19:33 UTCVendor advisory
  58. 2026-09-27 19:33 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  59. 2026-09-27 07:08 UTCVendor advisory
  60. 2026-09-27 07:08 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  61. 2026-09-26 18:42 UTCEG score recompute
  62. 2026-09-26 18:42 UTCVendor advisory
  63. 2026-09-26 18:42 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  64. 2026-09-26 15:59 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  65. 2026-09-25 07:11 UTCVendor advisory
  66. 2026-09-25 07:11 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  67. 2026-09-24 18:46 UTCEG score recompute
  68. 2026-09-24 18:46 UTCVendor advisory
  69. 2026-09-24 18:46 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  70. 2026-09-24 14:04 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  71. 2026-09-24 06:08 UTCEG score recompute
  72. 2026-09-24 06:08 UTCVendor advisory
  73. 2026-09-24 06:08 UTCGHSA enrichmentGHSA-28vh-mg6p-gxg7 · GitHub severity HIGH · GitHub CVSS 7.5
  74. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  75. 2026-09-23 17:43 UTCVendor advisory

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Frequently asked(5)

What is CVE-2026-5680?
CVE-2026-5680 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-5680 was made public on July 4, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on August 27, 2026. EchelonGraph's copy of the record carries a last-modified date of October 13, 2026; the record at its source may have been updated since.
Is CVE-2026-5680 actively exploited?
CVE-2026-5680 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (64th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-5680?
CVE-2026-5680 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-5680?
A fix for CVE-2026-5680 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-5680 are linked in the Vendor Advisories panel on this page.

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