CVE-2026-54399

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-01. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released 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: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive header length

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 24, 2026

Advisory Details (2)

Auto-updated Jul 6, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-54399: Apache HttpComponents Core: Unbounded HTTP Header/Line Length in Default Configuration

http://www.openwall.com/lists/oss-security/2026/07/01/4
generic
https://lists.apache.org/thread/zmxh1pl2zohov5ntdh4lt85gfrlchgpy

Vendor Advisories for CVE-2026-54399(3)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatpatch2026-07-30redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 86× 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. 2026-07-30 16:28 UTCEPSS rescore
  2. 2026-07-30 13:57 UTCEG score recompute
  3. 2026-07-30 13:57 UTCVendor advisory
  4. 2026-07-30 13:57 UTCGHSA enrichment
  5. 2026-07-30 01:30 UTCEPSS rescore
  6. 2026-07-30 01:12 UTCGHSA enrichment
  7. 2026-07-29 12:27 UTCGHSA enrichment
  8. 2026-07-28 23:42 UTCEG score recompute
  9. 2026-07-28 23:42 UTCGHSA enrichment
  10. 2026-07-28 15:37 UTCEPSS rescore
  11. 2026-07-28 09:09 UTCGHSA enrichment
  12. 2026-07-27 20:14 UTCEG score recompute
  13. 2026-07-27 20:13 UTCGHSA enrichment
  14. 2026-07-27 07:15 UTCGHSA enrichment
  15. 2026-07-26 18:28 UTCEG score recompute
  16. 2026-07-26 18:28 UTCGHSA enrichment
  17. 2026-07-26 14:54 UTCEPSS rescore
  18. 2026-07-26 05:10 UTCEG score recompute
  19. 2026-07-26 05:10 UTCGHSA enrichment
  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 03:19 UTCEG score recompute
  24. 2026-07-22 14:08 UTCEPSS rescore
  25. 2026-07-21 15:25 UTCEPSS rescore
Show 61 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 02:29 UTCEPSS rescore
  5. 2026-07-18 10:04 UTCEPSS rescore
  6. 2026-07-17 05:02 UTCGHSA enrichment
  7. 2026-07-16 17:03 UTCEPSS rescore
  8. 2026-07-16 16:18 UTCGHSA enrichment
  9. 2026-07-16 03:32 UTCGHSA enrichment
  10. 2026-07-15 16:57 UTCEPSS rescore
  11. 2026-07-15 16:57 UTCEPSS rescore
  12. 2026-07-15 14:47 UTCGHSA enrichment
  13. 2026-07-15 02:02 UTCGHSA enrichment
  14. 2026-07-15 02:00 UTCEPSS rescore
  15. 2026-07-15 02:00 UTCEPSS rescore
  16. 2026-07-14 13:16 UTCGHSA enrichment
  17. 2026-07-14 00:32 UTCGHSA enrichment
  18. 2026-07-13 22:31 UTCEPSS rescore
  19. 2026-07-13 11:47 UTCGHSA enrichment
  20. 2026-07-13 06:13 UTCEPSS rescore
  21. 2026-07-13 06:13 UTCEPSS rescore
  22. 2026-07-12 23:00 UTCGHSA enrichment
  23. 2026-07-12 10:15 UTCGHSA enrichment
  24. 2026-07-12 05:46 UTCEPSS rescore
  25. 2026-07-11 21:30 UTCGHSA enrichment
  26. 2026-07-11 08:46 UTCGHSA enrichment
  27. 2026-07-11 08:27 UTCEPSS rescore
  28. 2026-07-11 08:27 UTCEPSS rescore
  29. 2026-07-10 20:01 UTCGHSA enrichment
  30. 2026-07-10 07:16 UTCGHSA enrichment
  31. 2026-07-09 19:10 UTCEPSS rescore
  32. 2026-07-09 19:10 UTCEPSS rescore
  33. 2026-07-09 18:32 UTCGHSA enrichment
  34. 2026-07-09 05:46 UTCGHSA enrichment
  35. 2026-07-08 17:02 UTCGHSA enrichment
  36. 2026-07-08 15:16 UTCEPSS rescore
  37. 2026-07-08 15:16 UTCEPSS rescore
  38. 2026-07-08 04:17 UTCGHSA enrichment
  39. 2026-07-07 15:32 UTCGHSA enrichment
  40. 2026-07-07 13:46 UTCEPSS rescore
  41. 2026-07-07 13:46 UTCEPSS rescore
  42. 2026-07-07 02:35 UTCGHSA enrichment
  43. 2026-07-06 16:27 UTCEPSS rescore
  44. 2026-07-06 16:27 UTCEPSS rescore
  45. 2026-07-06 13:50 UTCGHSA enrichment
  46. 2026-07-06 02:23 UTCEPSS rescore
  47. 2026-07-06 02:23 UTCEPSS rescore
  48. 2026-07-06 01:04 UTCGHSA enrichment
  49. 2026-07-05 12:18 UTCGHSA enrichment
  50. 2026-07-05 02:31 UTCEPSS rescore
  51. 2026-07-05 02:30 UTCEPSS rescore
  52. 2026-07-04 23:33 UTCGHSA enrichment
  53. 2026-07-04 10:47 UTCGHSA enrichment
  54. 2026-07-04 06:31 UTCEPSS rescore
  55. 2026-07-04 06:31 UTCEPSS rescore
  56. 2026-07-03 22:02 UTCGHSA enrichment
  57. 2026-07-03 09:17 UTCGHSA enrichment
  58. 2026-07-02 20:32 UTCGHSA enrichment
  59. 2026-07-02 07:47 UTCGHSA enrichment
  60. 2026-07-01 19:03 UTCEG score recompute
  61. 2026-07-01 19:03 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-54399?
CVE-2026-54399 is a high vulnerability published on July 1, 2026. Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows an remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive…
When was CVE-2026-54399 disclosed?
CVE-2026-54399 was first published in the National Vulnerability Database on July 1, 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-2026-54399 actively exploited?
CVE-2026-54399 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.3% of all scored CVEs.
What is the CVSS score of CVE-2026-54399?
CVE-2026-54399 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-54399?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54399, 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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