CVE-2026-56743

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

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

Cilium is a networking, observability, and security solution. From 1.19.0 to 1.19.4, standard Kubernetes NetworkPolicy specifications using CIDR-based ipBlock rules without pod or namespace selectors erroneously generate a wildcard namespace allow rule when Cilium is configured with a custom clusterName rather than the default any value. The parser incorrectly instantiates a pod selector on selectorless peer definitions, allowing traffic from other workloads in the same namespace as the subject of the policy. This issue is fixed in version 1.19.5.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

July 15, 2026

Last Modified

July 17, 2026

Advisory Details (6)

Auto-updated Jul 16, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available

Cilium may unexpectedly allow ingress traffic from the local namespace when a Kubernetes NetworkPolicy is configured with an ipBlock match · Advisory · cilium/cilium · GitHub

https://github.com/cilium/cilium/security/advisories/GHSA-fm8w-2m5w-9j7r
github_release Patch Available

1.19.5

Patch available: cilium/cilium v1.19.5

https://github.com/cilium/cilium/releases/tag/v1.19.5
github_pr

[v1.19] fix: Fix wildcard namespace bypass for selectorless ipBlock rules

Fix merged in cilium/cilium PR #46456 on 2026-06-10 — awaiting tagged release

https://github.com/cilium/cilium/pull/46456
github_pr

fix: Fix wildcard namespace bypass for selectorless ipBlock rules

Fix merged in cilium/cilium PR #46305 on 2026-06-09 — awaiting tagged release

https://github.com/cilium/cilium/pull/46305
github_commit

commit bacea640404c (cilium/cilium)

Fix landed in cilium/cilium commit bacea640404c — awaiting tagged release

https://github.com/cilium/cilium/commit/bacea640404c0805c23515353dc1681c5bf35171
github_commit

commit 1c84ae3b58a7 (cilium/cilium)

Fix landed in cilium/cilium commit 1c84ae3b58a7 — awaiting tagged release

https://github.com/cilium/cilium/commit/1c84ae3b58a7cd54f7ee355e6c524c82f620eae8

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 27× 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. 2026-07-30 16:28 UTCEPSS rescore
  2. 2026-07-30 10:57 UTCEG score recompute
  3. 2026-07-30 01:30 UTCEPSS rescore
  4. 2026-07-30 01:30 UTCEPSS rescore
  5. 2026-07-29 11:11 UTCEG score recompute
  6. 2026-07-28 15:37 UTCEPSS rescore
  7. 2026-07-28 11:27 UTCEG score recompute
  8. 2026-07-27 14:14 UTCEPSS rescore
  9. 2026-07-27 11:15 UTCEG score recompute
  10. 2026-07-26 14:54 UTCEPSS rescore
  11. 2026-07-26 14:54 UTCEPSS rescore
  12. 2026-07-26 11:31 UTCEG score recompute
  13. 2026-07-25 14:18 UTCEPSS rescore
  14. 2026-07-25 14:18 UTCEPSS rescore
  15. 2026-07-24 14:18 UTCEPSS rescore
  16. 2026-07-23 14:18 UTCEPSS rescore
  17. 2026-07-23 03:20 UTCEG score recompute
  18. 2026-07-22 14:08 UTCEPSS rescore
  19. 2026-07-21 15:25 UTCEPSS rescore
  20. 2026-07-20 17:08 UTCEPSS rescore
  21. 2026-07-19 14:31 UTCEPSS rescore
  22. 2026-07-19 14:31 UTCEPSS rescore
  23. 2026-07-19 02:37 UTCEG score recompute
  24. 2026-07-19 02:29 UTCEPSS rescore
  25. 2026-07-16 17:03 UTCEPSS rescore
Show 2 more
  1. 2026-07-15 19:45 UTCEG score recompute
  2. 2026-07-15 19:44 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-56743?
CVE-2026-56743 is a medium vulnerability published on July 15, 2026. Cilium is a networking, observability, and security solution. From 1.19.0 to 1.19.4, standard Kubernetes NetworkPolicy specifications using CIDR-based ipBlock rules without pod or namespace selectors erroneously generate a wildcard namespace allow rule when Cilium is configured with a custom…
When was CVE-2026-56743 disclosed?
CVE-2026-56743 was first published in the National Vulnerability Database on July 15, 2026, with the most recent update on July 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56743 actively exploited?
CVE-2026-56743 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 94.5% of all scored CVEs.
What is the CVSS score of CVE-2026-56743?
CVE-2026-56743 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-56743?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56743, 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.

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