CVE-2026-56742

HIGHNVD 8.98.9
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.9 under NVD CVSS v3. EPSS exploit probability: 0.2% (6th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
8.9EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Cilium is a networking, observability, and security solution. Prior to 1.17.17, 1.18.11, and 1.19.5, Cilium clusters using Gateway API allow users with permissions to create or update namespaced HTTPRoutes to mirror HTTP traffic to any Service in any namespace, bypassing the ReferenceGrant authorization mechanism. Gateway API functionality is disabled by default. This issue is fixed in versions 1.17.17, 1.18.11, and 1.19.5.

CVSS v3
8.9
EG Score
8.9HIGHmedium confidence
EG Risk
40
EG Risk 40/100

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)
Severity89% × 45%
The EG Score, 8.9 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
6th
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 (8)

Auto-updated Jul 15, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Namespaced HTTPRoutes can redirect traffic to other namespaces · Advisory · cilium/cilium · GitHub

https://github.com/cilium/cilium/security/advisories/GHSA-w7c2-w76w-5hmj
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 release Patch Available

1.18.11

Patch available: cilium/cilium v1.18.11

https://github.com/cilium/cilium/releases/tag/v1.18.11
GitHub release Patch Available

1.17.17

Patch available: cilium/cilium v1.17.17

https://github.com/cilium/cilium/releases/tag/v1.17.17
GitHub commit

commit fd47963ea394 (cilium/cilium)

Fix landed in cilium/cilium commit fd47963ea394 — awaiting tagged release

https://github.com/cilium/cilium/commit/fd47963ea394d5e8fa4a88c40a79063430c512ca
GitHub commit

commit f23929cff682 (cilium/cilium)

Fix landed in cilium/cilium commit f23929cff682 — awaiting tagged release

https://github.com/cilium/cilium/commit/f23929cff682d6ed0dc158070812cb302fc0032b
GitHub commit

commit e0b1cef513ff (cilium/cilium)

Fix landed in cilium/cilium commit e0b1cef513ff — awaiting tagged release

https://github.com/cilium/cilium/commit/e0b1cef513ff910323f3743e9f3e3d86721e4857
GitHub commit

commit 7422068aff67 (cilium/cilium)

Fix landed in cilium/cilium commit 7422068aff67 — awaiting tagged release

https://github.com/cilium/cilium/commit/7422068aff67ac77c7dcc57aa5b9240c91333deb

Vendor Advisories for CVE-2026-56742(1)

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

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFix by version rangeDependents
github.com/cilium/cilium—
  • every version up to 1.17.17: fixed in 1.17.17
  • 1.19.0 up to 1.19.5: fixed in 1.19.5
  • 1.18.0 up to 1.18.11: fixed in 1.18.11
—
github.com/cilium/ciliumCilium—
  • 1.18.0 up to 1.18.11: fixed in 1.18.11
—

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 134 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 34 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% · 6th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 6th 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% · 6th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  10. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  15. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  16. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  18. 2026-10-01 12:36 UTCEG score recompute
  19. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  20. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  22. 2026-09-28 08:43 UTCEG score recompute
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 5th percentile
  25. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 17th percentile
Show 75 more
  1. 2026-09-24 08:47 UTCEG score recompute
  2. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  3. 2026-09-23 03:15 UTCEG score recompute
  4. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  6. 2026-09-18 04:44 UTCEG score recompute
  7. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  8. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  9. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  10. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  11. 2026-09-13 23:11 UTCEG score recompute
  12. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 19th 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 0.3% · 19th percentile
  16. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  17. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  18. 2026-09-08 00:45 UTCEG score recompute
  19. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  20. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-09-05 20:48 UTCEG score recompute
  22. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  23. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  24. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  25. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  26. 2026-08-31 06:02 UTCEG score recompute
  27. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  28. 2026-08-30 03:46 UTCEG score recompute
  29. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  30. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  31. 2026-08-26 23:05 UTCEG score recompute
  32. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  33. 2026-08-26 02:12 UTCEG score recompute
  34. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  35. 2026-08-24 23:45 UTCEG score recompute
  36. 2026-08-24 10:37 UTCEG score recompute
  37. 2026-08-23 08:19 UTCEG score recompute
  38. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  39. 2026-08-22 06:03 UTCEG score recompute
  40. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  41. 2026-08-21 03:45 UTCEG score recompute
  42. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  43. 2026-08-20 00:14 UTCEG score recompute
  44. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  45. 2026-08-18 19:59 UTCEG score recompute
  46. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  47. 2026-08-18 02:33 UTCEG score recompute
  48. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  49. 2026-08-16 22:46 UTCEG score recompute
  50. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  51. 2026-08-16 09:38 UTCEG score recompute
  52. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  53. 2026-08-15 07:23 UTCEG score recompute
  54. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  55. 2026-08-14 04:54 UTCEG score recompute
  56. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  57. 2026-08-13 02:38 UTCEG score recompute
  58. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  59. 2026-08-12 00:23 UTCEG score recompute
  60. 2026-08-11 11:11 UTCEG score recompute
  61. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  62. 2026-08-09 19:49 UTCEG score recompute
  63. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  64. 2026-08-08 17:35 UTCEG score recompute
  65. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  66. 2026-08-08 04:27 UTCEG score recompute
  67. 2026-08-07 02:12 UTCEG score recompute
  68. 2026-08-06 13:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  69. 2026-08-05 23:57 UTCEG score recompute
  70. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  71. 2026-08-04 21:42 UTCEG score recompute
  72. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  73. 2026-08-04 10:39 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  74. 2026-08-03 19:02 UTCEG score recompute
  75. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 6th percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-56742?
CVE-2026-56742 is a high-severity vulnerability; its CVE record was published on July 15, 2026. Cilium is a networking, observability, and security solution. Prior to 1.17.17, 1.18.11, and 1.19.5, Cilium clusters using Gateway API allow users with permissions to create or update namespaced HTTPRoutes to mirror HTTP traffic to any Service in any namespace, bypassing the ReferenceGrant…
When was the CVE record for CVE-2026-56742 published?
The CVE record for CVE-2026-56742 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-2026-56742 actively exploited?
CVE-2026-56742 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56742?
CVE-2026-56742 has a CVSS v3 base score of 8.9 (NVD).
How do I remediate CVE-2026-56742?
A fix for CVE-2026-56742 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56742 are linked in the Vendor Advisories panel on this page.

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