CVE-2026-65601

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 85% 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: cna:vulncheck, epss
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route author holding a ReferenceGrant for a cross-namespace Service could therefore bind a Traefik Middleware from the backend namespace without a separate grant for that middleware, potentially injecting trusted reverse-proxy identity headers into downstream requests. The issue is fixed in version 3.7.7.

CVSS v3
5.3
EG Score
5.3(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
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

July 22, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated Jul 22, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
generic Patch Available

Traefik before 3.7.7 Namespace Confusion via HTTPRoute ExtensionRef | Advisories | VulnCheck

https://www.vulncheck.com/advisories/traefik-before-namespace-confusion-via-httproute-extensionref
github_commit

commit 26c96a3935ca (traefik/traefik)

Fix landed in traefik/traefik commit 26c96a3935ca — awaiting tagged release

https://github.com/traefik/traefik/commit/26c96a3935cafb473f4a5bae1886560d9aa4e4f0
github Patch Available🟡 PoC Available

Traefik Gateway API HTTPRoute BackendRef ExtensionRef Namespace Confusion · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-qq9q-x9w4-chhj

Vendor Advisories for CVE-2026-65601(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 72× 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. 2026-07-31 01:11 UTCEG score recompute
  2. 2026-07-31 01:11 UTCGHSA enrichment
  3. 2026-07-30 16:28 UTCEPSS rescore
  4. 2026-07-30 01:40 UTCEG score recompute
  5. 2026-07-30 01:40 UTCGHSA enrichment
  6. 2026-07-30 01:30 UTCEPSS rescore
  7. 2026-07-29 02:05 UTCEG score recompute
  8. 2026-07-29 02:05 UTCGHSA enrichment
  9. 2026-07-28 15:37 UTCEPSS rescore
  10. 2026-07-28 02:33 UTCEG score recompute
  11. 2026-07-28 02:33 UTCGHSA enrichment
  12. 2026-07-27 14:14 UTCEPSS rescore
  13. 2026-07-27 03:02 UTCEG score recompute
  14. 2026-07-27 03:02 UTCGHSA enrichment
  15. 2026-07-26 14:54 UTCEPSS rescore
  16. 2026-07-26 14:54 UTCEPSS rescore
  17. 2026-07-26 03:29 UTCEG score recompute
  18. 2026-07-26 03:29 UTCGHSA enrichment
  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. 2026-07-24 14:18 UTCEPSS rescore
  23. 2026-07-23 14:18 UTCEPSS rescore
  24. 2026-07-23 14:18 UTCEPSS rescore
  25. 2026-07-23 03:22 UTCEG score recompute
Show 47 more
  1. 2026-07-22 22:06 UTCEG score recompute
  2. 2026-07-22 22:06 UTCGHSA enrichment
  3. 2026-07-22 20:01 UTCGHSA enrichment
  4. 2026-07-22 19:59 UTCGHSA enrichment
  5. 2026-07-22 19:58 UTCGHSA enrichment
  6. 2026-07-22 19:52 UTCGHSA enrichment
  7. 2026-07-22 19:49 UTCGHSA enrichment
  8. 2026-07-22 19:47 UTCGHSA enrichment
  9. 2026-07-22 19:46 UTCGHSA enrichment
  10. 2026-07-22 19:44 UTCGHSA enrichment
  11. 2026-07-22 19:42 UTCGHSA enrichment
  12. 2026-07-22 19:39 UTCGHSA enrichment
  13. 2026-07-22 19:38 UTCGHSA enrichment
  14. 2026-07-22 19:38 UTCGHSA enrichment
  15. 2026-07-22 19:37 UTCGHSA enrichment
  16. 2026-07-22 19:36 UTCGHSA enrichment
  17. 2026-07-22 19:35 UTCGHSA enrichment
  18. 2026-07-22 19:31 UTCGHSA enrichment
  19. 2026-07-22 19:30 UTCGHSA enrichment
  20. 2026-07-22 19:29 UTCGHSA enrichment
  21. 2026-07-22 19:28 UTCGHSA enrichment
  22. 2026-07-22 19:28 UTCGHSA enrichment
  23. 2026-07-22 19:26 UTCGHSA enrichment
  24. 2026-07-22 19:26 UTCGHSA enrichment
  25. 2026-07-22 19:25 UTCGHSA enrichment
  26. 2026-07-22 19:21 UTCGHSA enrichment
  27. 2026-07-22 19:20 UTCGHSA enrichment
  28. 2026-07-22 19:13 UTCGHSA enrichment
  29. 2026-07-22 19:01 UTCGHSA enrichment
  30. 2026-07-22 18:49 UTCGHSA enrichment
  31. 2026-07-22 18:47 UTCGHSA enrichment
  32. 2026-07-22 18:46 UTCGHSA enrichment
  33. 2026-07-22 18:45 UTCGHSA enrichment
  34. 2026-07-22 18:32 UTCGHSA enrichment
  35. 2026-07-22 18:29 UTCGHSA enrichment
  36. 2026-07-22 18:22 UTCGHSA enrichment
  37. 2026-07-22 18:18 UTCGHSA enrichment
  38. 2026-07-22 17:54 UTCGHSA enrichment
  39. 2026-07-22 17:49 UTCGHSA enrichment
  40. 2026-07-22 17:28 UTCGHSA enrichment
  41. 2026-07-22 17:26 UTCGHSA enrichment
  42. 2026-07-22 17:19 UTCGHSA enrichment
  43. 2026-07-22 17:17 UTCGHSA enrichment
  44. 2026-07-22 13:35 UTCEG score recompute
  45. 2026-07-22 13:35 UTCGHSA enrichment
  46. 2026-07-22 11:32 UTCEG score recompute
  47. 2026-07-22 11:32 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-65601?
CVE-2026-65601 is a medium vulnerability published on July 22, 2026. Traefik versions 3.7.0 through 3.7.6 contain a namespace confusion vulnerability in the Kubernetes Gateway API provider. When resolving HTTPRoute.spec.rules[].backendRefs[].filters[].extensionRef, Traefik used the backend Service namespace instead of the HTTPRoute namespace. A low-privileged route…
When was CVE-2026-65601 disclosed?
CVE-2026-65601 was first published in the National Vulnerability Database on July 22, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-65601 actively exploited?
CVE-2026-65601 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 85.0% of all scored CVEs.
What is the CVSS score of CVE-2026-65601?
CVE-2026-65601 has a CVSS v4.0 base score of 5.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-65601?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-65601, 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

Explore the affected products and dependency analysis for CVE-2026-65601

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