CVE-2026-54761

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 76% 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
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 0

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

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.21 and 3.7.5, there is a high severity vulnerability in Traefik's Kubernetes Gateway provider affecting the crossProviderNamespaces allowlist. For HTTPRoute rules that declare multiple (WRR) backendRefs, Traefik evaluates the allowlist against the target backendRef.namespace instead of the route's own namespace. As a result, an HTTPRoute created in a namespace that is not allow-listed can reference a cross-provider TraefikService such as api@internal, dashboard@internal or rest@internal by pointing backendRef.namespace at an allow-listed namespace covered by a Gateway API ReferenceGrant, exposing internal Traefik services on the data plane. Exploitation requires the ability to create an accepted HTTPRoute and a matching ReferenceGrant from an allow-listed namespace; it does not require any change to Traefik static configuration, RBAC, or the deployment itself. This vulnerability is fixed in 3.6.21 and 3.7.5.

CVSS v3
7.1
EG Score
7.1(medium)
EPSS
23.7%
KEV
Not listed

Published

June 17, 2026

Last Modified

June 26, 2026

Advisory Details (3)

Auto-updated Jun 25, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github.
github Patch Available🟡 PoC Available

Kubernetes Gateway crossProviderNamespaces bypass allows HTTPRoute outside the allowlist to expose internal Traefik services · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-3g6v-2r68-prfc
github_release Patch Available

v3.7.5

Patch available: traefik/traefik v3.7.5

https://github.com/traefik/traefik/releases/tag/v3.7.5
github_release Patch Available

v3.6.21

Patch available: traefik/traefik v3.6.21

https://github.com/traefik/traefik/releases/tag/v3.6.21

Vendor Advisories for CVE-2026-54761(1)

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

Affected Packages

(3 across 1 ecosystem)
Go(3)
PackageVulnerable rangeFixed inDependents
github.com/traefik/traefik———
github.com/traefik/traefik/v2———
github.com/traefik/traefik/v3—3.7.5—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 43× 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. 2026-07-06 23:27 UTCEG score recompute
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 12:26 UTCEG score recompute
  5. 2026-07-06 02:23 UTCEPSS rescore
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 22:18 UTCEG score recompute
  8. 2026-07-05 11:17 UTCEG score recompute
  9. 2026-07-05 02:31 UTCEPSS rescore
  10. 2026-07-05 02:30 UTCEPSS rescore
  11. 2026-07-05 00:15 UTCEG score recompute
  12. 2026-07-04 13:10 UTCEG score recompute
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-04 02:09 UTCEG score recompute
  16. 2026-07-03 14:58 UTCEG score recompute
  17. 2026-07-03 03:56 UTCEG score recompute
  18. 2026-07-02 16:34 UTCEG score recompute
  19. 2026-07-02 05:31 UTCEG score recompute
  20. 2026-07-01 18:30 UTCEG score recompute
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-07-01 07:29 UTCEG score recompute
  23. 2026-06-30 23:22 UTCEPSS rescore
  24. 2026-06-30 20:28 UTCEG score recompute
  25. 2026-06-30 09:27 UTCEG score recompute
Show 18 more
  1. 2026-06-29 22:25 UTCEG score recompute
  2. 2026-06-29 11:24 UTCEG score recompute
  3. 2026-06-29 00:23 UTCEG score recompute
  4. 2026-06-28 14:07 UTCEPSS rescore
  5. 2026-06-28 13:22 UTCEG score recompute
  6. 2026-06-28 04:56 UTCEPSS rescore
  7. 2026-06-28 04:56 UTCEPSS rescore
  8. 2026-06-28 02:21 UTCEG score recompute
  9. 2026-06-27 15:20 UTCEG score recompute▲ 1.10
  10. 2026-06-27 03:08 UTCEPSS rescore
  11. 2026-06-26 17:41 UTCNVD updateCVSS v3 → 7.1 · severity → HIGH
  12. 2026-06-26 14:16 UTCEG score recompute
  13. 2026-06-25 13:49 UTCEPSS rescore
  14. 2026-06-25 13:08 UTCEG score recompute
  15. 2026-06-24 14:05 UTCEPSS rescore
  16. 2026-06-24 12:03 UTCEG score recompute▲ 6.00
  17. 2026-06-24 12:01 UTCNVD updateCVSS v3 → 6 · CVSS v4 → 6
  18. 2026-06-17 14:06 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-54761?
CVE-2026-54761 is a high vulnerability published on June 17, 2026. Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.21 and 3.7.5, there is a high severity vulnerability in Traefik's Kubernetes Gateway provider affecting the crossProviderNamespaces allowlist. For HTTPRoute rules that declare multiple (WRR) backendRefs, Traefik evaluates the…
When was CVE-2026-54761 disclosed?
CVE-2026-54761 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54761 actively exploited?
CVE-2026-54761 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 23.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54761?
CVE-2026-54761 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-54761?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54761, 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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