CVE-2026-56743

MEDIUMPre-NVD 5.45.4
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (14th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

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)
Severity54% × 45%
The EG Score, 5.4 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
0.2%
EPSS %ILE
14th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (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

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 advisoryMentions a patch (unverified)

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 pull request

[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 pull request

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

Vendor Advisories for CVE-2026-56743(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)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/cilium/cilium—
  • 1.19.0 up to 1.19.5: fixed in 1.19.5
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 35× 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 131 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 31 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  3. 2026-10-12 15:54 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  18. 2026-10-01 12:36 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  22. 2026-09-28 08:42 UTCEG score recompute
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  25. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.2% · 14th percentile
Show 75 more
  1. 2026-09-24 08:47 UTCEG score recompute
  2. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  3. 2026-09-23 03:15 UTCEG score recompute
  4. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  6. 2026-09-18 04:44 UTCEG score recompute
  7. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  8. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  9. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  10. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  11. 2026-09-14 06:57 UTCEG score recompute
  12. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  13. 2026-09-13 07:12 UTCEG score recompute
  14. 2026-09-11 21:44 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  16. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  17. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  18. 2026-09-08 00:45 UTCEG score recompute
  19. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  20. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 16th percentile
  21. 2026-09-05 20:48 UTCEG score recompute
  22. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  23. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  24. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  25. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  26. 2026-08-31 03:50 UTCEG score recompute
  27. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  28. 2026-08-30 03:46 UTCEG score recompute
  29. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  30. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  31. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  32. 2026-08-27 12:38 UTCEG score recompute
  33. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  34. 2026-08-26 05:52 UTCEG score recompute
  35. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  36. 2026-08-25 05:23 UTCEG score recompute
  37. 2026-08-23 05:54 UTCEG score recompute
  38. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  39. 2026-08-22 06:05 UTCEG score recompute
  40. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  41. 2026-08-21 06:21 UTCEG score recompute
  42. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  43. 2026-08-20 06:36 UTCEG score recompute
  44. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  45. 2026-08-19 06:51 UTCEG score recompute
  46. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  47. 2026-08-18 06:34 UTCEG score recompute
  48. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  49. 2026-08-17 06:50 UTCEG score recompute
  50. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  51. 2026-08-16 07:06 UTCEG score recompute
  52. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  53. 2026-08-15 07:23 UTCEG score recompute
  54. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  55. 2026-08-14 07:38 UTCEG score recompute
  56. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  57. 2026-08-13 07:53 UTCEG score recompute
  58. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  59. 2026-08-11 08:24 UTCEG score recompute
  60. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  61. 2026-08-10 08:40 UTCEG score recompute
  62. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  63. 2026-08-09 08:56 UTCEG score recompute
  64. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  65. 2026-08-08 09:12 UTCEG score recompute
  66. 2026-08-07 09:28 UTCEG score recompute
  67. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  68. 2026-08-06 09:44 UTCEG score recompute
  69. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  70. 2026-08-05 09:58 UTCEG score recompute
  71. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  72. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  73. 2026-08-04 10:00 UTCEG score recompute
  74. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  75. 2026-08-02 10:17 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-56743?
CVE-2026-56743 is a medium-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-56743 published?
The CVE record for CVE-2026-56743 was published on July 15, 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 July 17, 2026; the record at its source may have been updated since.
Is CVE-2026-56743 actively exploited?
CVE-2026-56743 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (14th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56743?
CVE-2026-56743 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-56743?
A fix for CVE-2026-56743 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56743 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-56743

Explore →

Is Your Infrastructure Affected by CVE-2026-56743?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs