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.
CVE-2026-43678
“—” 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.
- Lower severity and no public exploit yet
The CVE record names the fixed release — apply it.
- CVSS v3
- 5.3
- EG Score
- 5.3MEDIUMmedium confidence
- EG Risk
- 39EG 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, 2026Build 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-h585Weakness 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.
- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-10-12 16:06 UTCEG score recompute
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- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
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- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 29th percentile
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- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 28th percentile
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- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
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- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
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- 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 21st percentile
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- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
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- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
- 2026-09-12 19:33 UTCEG score recompute
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- 2026-09-11 21:19 UTCEG score recompute
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 20th percentile
- 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 20th percentile
- 2026-09-10 23:04 UTCEG score recompute
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 20th percentile
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- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 20th percentile
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- 2026-08-28 09:47 UTCEG score recompute
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 20th percentile
- 2026-08-27 11:32 UTCEG score recompute
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
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- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
- 2026-08-24 16:48 UTCEG score recompute
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- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-08-22 17:45 UTCEG score recompute
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
- 2026-08-20 19:52 UTCEG score recomputeFirst assessed: 5.3 MEDIUM
- 2026-08-20 19:51 UTCMITRE cvelistV5CVSS v3 → 5.3 · severity → MEDIUM
- 2026-08-20 19:17 UTCNVD update
- 2026-08-20 19:12 UTCEG score recompute
- 2026-08-20 19:11 UTCMITRE cvelistV5first tracked
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Frequently asked(5)
What is CVE-2026-43678?
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Is CVE-2026-43678 actively exploited?
What is the CVSS score of CVE-2026-43678?
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Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-43678
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