CVE-2026-56742

HIGHNVD 8.98.9—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.9 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 93% 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, nvd
8.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.9Exploit: 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. 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
8.9(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity89% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

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 Patch Available

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 35× 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. 2026-08-03 10:36 UTCEPSS rescore
  2. 2026-08-02 03:35 UTCEG score recompute
  3. 2026-08-02 02:27 UTCEPSS rescore
  4. 2026-08-01 14:27 UTCEG score recompute
  5. 2026-08-01 04:16 UTCEPSS rescore
  6. 2026-07-30 23:02 UTCEG score recompute
  7. 2026-07-30 16:28 UTCEPSS rescore
  8. 2026-07-30 09:53 UTCEG score recompute
  9. 2026-07-30 01:30 UTCEPSS rescore
  10. 2026-07-30 01:30 UTCEPSS rescore
  11. 2026-07-28 17:33 UTCEG score recompute
  12. 2026-07-28 15:37 UTCEPSS rescore
  13. 2026-07-27 15:17 UTCEG score recompute
  14. 2026-07-27 14:14 UTCEPSS rescore
  15. 2026-07-27 00:40 UTCEG score recompute
  16. 2026-07-26 14:54 UTCEPSS rescore
  17. 2026-07-26 14:54 UTCEPSS rescore
  18. 2026-07-26 11:31 UTCEG score recompute
  19. 2026-07-25 14:18 UTCEPSS rescore
  20. 2026-07-25 14:18 UTCEPSS rescore
  21. 2026-07-24 14:18 UTCEPSS rescore
  22. 2026-07-23 14:18 UTCEPSS rescore
  23. 2026-07-23 03:20 UTCEG score recompute
  24. 2026-07-22 14:08 UTCEPSS rescore
  25. 2026-07-21 15:25 UTCEPSS rescore
Show 10 more
  1. 2026-07-20 17:08 UTCEPSS rescore
  2. 2026-07-19 14:31 UTCEPSS rescore
  3. 2026-07-19 14:31 UTCEPSS rescore
  4. 2026-07-19 02:37 UTCEG score recompute▲ 3.00
  5. 2026-07-19 02:29 UTCEPSS rescore
  6. 2026-07-18 10:04 UTCEPSS rescore
  7. 2026-07-17 18:00 UTCNVD updateCVSS v3 → 8.9 · severity → HIGH
  8. 2026-07-16 17:03 UTCEPSS rescore
  9. 2026-07-15 19:45 UTCEG score recompute
  10. 2026-07-15 19:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56742?
CVE-2026-56742 is a high vulnerability 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 CVE-2026-56742 disclosed?
CVE-2026-56742 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-2026-56742 actively exploited?
CVE-2026-56742 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 93.2% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56742, 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.

Dependency Blast Radius

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