CVE-2026-54665

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-06-22. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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.

Apache NiFi 0.0.1 through 2.9.0 support building qualified URLs from one of several HTTP request headers that provide an alternative to the standard Host header without validating the values provided. Apache NiFi 1.6.0 introduced a configurable application property to restrict values provided in the HTTP Host header, but did not apply the validation to alternative Proxy and Forwarded headers. The absence of proxy host header validation allowed a client to instruct Apache NiFi web services to construct invalid qualified URLs for redirection or data references. Upgrading to Apache NiFi 2.10.0 is the recommended mitigation, which implements validation for the X-ProxyHost and X-Forwarded-Host HTTP request headers based on the nifi.web.proxy.host property. Enabling header validation requires configuring the application with HTTPS. Reverse proxy servers in front of Apache NiFi are responsible for filtering input request headers and providing allowed values to the application.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

June 22, 2026

Last Modified

June 23, 2026

Advisory Details (2)

Auto-updated Jun 22, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-54665: Apache NiFi: Missing Validation for Proxy Host Headers

http://www.openwall.com/lists/oss-security/2026/06/20/7
generic
https://lists.apache.org/thread/y0yoblon8f6dp00qz5r90cxq5n6g4j6k

Vendor Advisories for CVE-2026-54665(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 15× in last 7d / 73× 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 154 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-54665?
CVE-2026-54665 is a medium vulnerability published on June 22, 2026. Apache NiFi 0.0.1 through 2.9.0 support building qualified URLs from one of several HTTP request headers that provide an alternative to the standard Host header without validating the values provided. Apache NiFi 1.6.0 introduced a configurable application property to restrict values provided in…
When was CVE-2026-54665 disclosed?
CVE-2026-54665 was first published in the National Vulnerability Database on June 22, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54665 actively exploited?
CVE-2026-54665 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 74.9% of all scored CVEs.
What is the CVSS score of CVE-2026-54665?
CVE-2026-54665 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-54665?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54665, 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-2026-54665

Explore →

Is Your Infrastructure Affected by CVE-2026-54665?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs