CVE-2026-43678

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.3 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.4% (29th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from CISA-ADP (Vulnrichment) CVSS v3.1
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS
5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.3Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

An unauthenticated remote peer can crash any NIOWebSocket-based server (including Vapor and Hummingbird) with a single 11-byte frame sent after a completed WebSocket handshake, dropping all active connections until the process restarts. This vulnerability is addressed in swift-nio version 2.101.0.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation0.4% × 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: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

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

The CVE record names the fixed release. 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 20, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 20, 2026
Fix named in the CVE record. Sources: github.
GitHub advisoryMentions a patch (unverified)

Build filesystem sync discloses host files outside the build context via symlinks · Advisory · apple/container · GitHub

https://github.com/apple/container/security/advisories/GHSA-2v2q-4q35-h585

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 49× 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.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  3. 2026-10-12 16:06 UTCEG score recompute
  4. 2026-10-11 19:48 UTCEG score recompute
  5. 2026-10-11 17:02 UTCEG score recompute
  6. 2026-10-11 14:28 UTCEG score recompute
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  10. 2026-10-09 08:20 UTCEG score recompute
  11. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  12. 2026-10-08 05:14 UTCEG score recompute
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  14. 2026-10-07 01:37 UTCEG score recompute
  15. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  16. 2026-10-06 03:20 UTCEG score recompute
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  18. 2026-10-05 01:38 UTCEG score recompute
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  20. 2026-10-04 03:23 UTCEG score recompute
  21. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  22. 2026-10-03 05:08 UTCEG score recompute
  23. 2026-10-02 06:49 UTCEG score recompute
  24. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  25. 2026-10-01 06:24 UTCEG score recompute
Show 71 more
  1. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  2. 2026-09-30 08:10 UTCEG score recompute
  3. 2026-09-28 23:25 UTCEG score recompute
  4. 2026-09-28 01:11 UTCEG score recompute
  5. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  6. 2026-09-27 02:56 UTCEG score recompute
  7. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  8. 2026-09-25 00:40 UTCEG score recompute
  9. 2026-09-23 22:37 UTCEG score recompute
  10. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  11. 2026-09-23 00:23 UTCEG score recompute
  12. 2026-09-22 02:09 UTCEG score recompute
  13. 2026-09-21 03:51 UTCEG score recompute
  14. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  15. 2026-09-20 05:36 UTCEG score recompute
  16. 2026-09-19 07:22 UTCEG score recompute
  17. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  18. 2026-09-18 09:07 UTCEG score recompute
  19. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  20. 2026-09-17 10:53 UTCEG score recompute
  21. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  22. 2026-09-16 12:29 UTCEG score recompute
  23. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  24. 2026-09-15 14:15 UTCEG score recompute
  25. 2026-09-13 17:47 UTCEG score recompute
  26. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  27. 2026-09-12 19:33 UTCEG score recompute
  28. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  29. 2026-09-11 21:19 UTCEG score recompute
  30. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  31. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  32. 2026-09-10 23:04 UTCEG score recompute
  33. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  34. 2026-09-09 01:54 UTCEG score recompute
  35. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  36. 2026-09-07 23:20 UTCEG score recompute
  37. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  38. 2026-09-07 01:05 UTCEG score recompute
  39. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  40. 2026-09-06 02:49 UTCEG score recompute
  41. 2026-09-05 04:35 UTCEG score recompute
  42. 2026-09-04 06:21 UTCEG score recompute
  43. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  44. 2026-09-03 08:04 UTCEG score recompute
  45. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  46. 2026-09-02 09:46 UTCEG score recompute
  47. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  48. 2026-09-01 11:31 UTCEG score recompute
  49. 2026-08-31 13:10 UTCEG score recompute
  50. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  51. 2026-08-30 14:28 UTCEG score recompute
  52. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  53. 2026-08-29 16:14 UTCEG score recompute
  54. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  55. 2026-08-28 09:47 UTCEG score recompute
  56. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  57. 2026-08-27 11:32 UTCEG score recompute
  58. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  59. 2026-08-25 15:03 UTCEG score recompute
  60. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  61. 2026-08-24 16:48 UTCEG score recompute
  62. 2026-08-24 14:13 UTCEG score recompute
  63. 2026-08-23 15:59 UTCEG score recompute
  64. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  65. 2026-08-22 17:45 UTCEG score recompute
  66. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  67. 2026-08-20 19:52 UTCEG score recomputeFirst assessed: 5.3 MEDIUM
  68. 2026-08-20 19:51 UTCMITRE cvelistV5CVSS v3 → 5.3 · severity → MEDIUM
  69. 2026-08-20 19:17 UTCNVD update
  70. 2026-08-20 19:12 UTCEG score recompute
  71. 2026-08-20 19:11 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-43678?
CVE-2026-43678 is a medium-severity vulnerability; its CVE record was published on August 20, 2026. An unauthenticated remote peer can crash any NIOWebSocket-based server (including Vapor and Hummingbird) with a single 11-byte frame sent after a completed WebSocket handshake, dropping all active connections until the process restarts. This vulnerability is addressed in swift-nio version 2.101.0.
When was the CVE record for CVE-2026-43678 published?
The CVE record for CVE-2026-43678 was published on August 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 28, 2026; the record at its source may have been updated since.
Is CVE-2026-43678 actively exploited?
CVE-2026-43678 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-43678?
CVE-2026-43678 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-43678?
The CVE record for CVE-2026-43678 names the fix: "This vulnerability is addressed in swift-nio version 2.101.0."

Dependency Blast Radius

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