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 — 3 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

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)
EPSS
32.9%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 6, 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(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 30× in last 7d / 30× 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. 2026-07-07 02:35 UTCEG score recompute
  2. 2026-07-07 02:35 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 13:50 UTCEG score recompute
  6. 2026-07-06 13:50 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-06 01:04 UTCEG score recompute
  10. 2026-07-06 01:04 UTCGHSA enrichment
  11. 2026-07-05 12:18 UTCEG score recompute
  12. 2026-07-05 12:18 UTCGHSA enrichment
  13. 2026-07-05 02:31 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 23:33 UTCEG score recompute
  16. 2026-07-04 23:33 UTCGHSA enrichment
  17. 2026-07-04 10:48 UTCEG score recompute
  18. 2026-07-04 10:47 UTCGHSA enrichment
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-03 22:03 UTCEG score recompute
  22. 2026-07-03 22:02 UTCGHSA enrichment
  23. 2026-07-03 09:17 UTCEG score recompute
  24. 2026-07-03 09:17 UTCGHSA enrichment
  25. 2026-07-02 20:32 UTCEG score recompute
Show 5 more
  1. 2026-07-02 20:32 UTCGHSA enrichment
  2. 2026-07-02 07:48 UTCEG score recompute
  3. 2026-07-02 07:47 UTCGHSA enrichment
  4. 2026-07-01 19:03 UTCEG score recompute
  5. 2026-07-01 19:03 UTCGHSA enrichment

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 6, 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 32.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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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