CVE-2026-54428

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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
7.5EG
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.

Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder 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 oversized compressed header blocks before the HTTP/2 SETTINGS acknowledgement causes the configured header list size limit to be applied.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
56%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 24, 2026

Advisory Details (2)

Auto-updated Jul 1, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-54428: Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK

http://www.openwall.com/lists/oss-security/2026/07/01/3
generic
https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd

Vendor Advisories for CVE-2026-54428(9)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhathttpcore5-h22026-08-13redhat
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.

Affected Packages

(5 across 3 ecosystems)
Debian:13(2)
PackageVulnerable rangeFixed inDependents
httpcomponents-core4.4.16-1——
httpcomponents-core55.2.2-1 ... 5.4.2-2 (6 versions)——
Debian:14(2)
PackageVulnerable rangeFixed inDependents
httpcomponents-core4.4.16-1——
httpcomponents-core55.2.2-1 ... 5.4.2-2 (6 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
httpcomponents-core55.2.1-1 ... 5.4.2-2 (7 versions)——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 24× in last 7d / 137× 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 207 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-54428?
CVE-2026-54428 is a high vulnerability published on July 1, 2026. Allocation of resources without limits or throttling in the HTTP/2 HPACK decoder 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 oversized compressed header blocks before the HTTP/2…
When was CVE-2026-54428 disclosed?
CVE-2026-54428 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-2026-54428 actively exploited?
CVE-2026-54428 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 43.9% of all scored CVEs.
What is the CVSS score of CVE-2026-54428?
CVE-2026-54428 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-54428?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54428, 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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