CVE-2026-6540

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-30. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

Calico's Application Layer Policy (disabled by default), which enforces HTTP rules through Dikastes, fails to perform URL path normalization. As a result, HTTP requests using path-traversal segments, encoded slashes, or repeated slashes are not correctly evaluated by Prefix path rules. Dikastes authorizes the request under the permitted prefix while the downstream workload or a fronting proxy normalizes the path and serves the restricted endpoint. An attacker with network access and no special RBAC can potentially reach HTTP endpoints the policy was intended to restrict.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
31%
KEV
Not listed

Published

July 30, 2026

Last Modified

August 8, 2026

Advisory Details (4)

Auto-updated Jul 30, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

Security Bulletins – TTA-2026-005, CVE-2026-6540 | Tigera – Creator of Calico

https://www.tigera.io/security-bulletins/tta-2026-005/
github_pr

[release-v3.31] fix(app-policy): normalize HTTP request-target before ALP path matching

Fix merged in projectcalico/calico PR #12533 on 2026-06-15 — awaiting tagged release

https://github.com/projectcalico/calico/pull/12533
github_pr

[release-v3.32] fix(app-policy): normalize HTTP request-target before ALP path matching

Fix merged in projectcalico/calico PR #12532 on 2026-04-17 — awaiting tagged release

https://github.com/projectcalico/calico/pull/12532
github_pr

fix(app-policy): normalize HTTP request-target before ALP path matching

Fix merged in projectcalico/calico PR #12531 on 2026-04-17 — awaiting tagged release

https://github.com/projectcalico/calico/pull/12531

Vendor Advisories for CVE-2026-6540(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 93× 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.

Showing the most recent 100 of 187 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-6540?
CVE-2026-6540 is a high vulnerability published on July 30, 2026. Calico's Application Layer Policy (disabled by default), which enforces HTTP rules through Dikastes, fails to perform URL path normalization. As a result, HTTP requests using path-traversal segments, encoded slashes, or repeated slashes are not correctly evaluated by Prefix path rules. Dikastes…
When was CVE-2026-6540 disclosed?
CVE-2026-6540 was first published in the National Vulnerability Database on July 30, 2026, with the most recent update on August 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6540 actively exploited?
CVE-2026-6540 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 69.5% of all scored CVEs.
What is the CVSS score of CVE-2026-6540?
CVE-2026-6540 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-6540?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6540, 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.

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