CVE-2026-64607

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-07-31. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
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

A fix is available — apply it.

HttpClient based on the classic i/o model fails to correctly release the underlying connection back to the connection manager if it encounters an invalid or unsupported Content-Encoding header value in the response message. Please note this defect does not affect HttpClient based on the async i/o model.

This issue affects Apache HttpComponents Client: from 5.0-alpha1 through 5.6.2.

CVSS v3
5.3
EG Score
5.3(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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

July 31, 2026

Last Modified

August 13, 2026

Advisory Details (1)

Auto-updated Jul 31, 2026
No patch confirmed yet.
generic
https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q

Vendor Advisories for CVE-2026-64607(13)

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

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatquarkus-apache-httpclient2026-09-03redhat
redhatocp-tools-4/jenkins-rhel9:17871250692026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871246322026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871246352026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871249252026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871253112026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871247792026-08-26redhat
redhatocp-tools-4/jenkins-rhel8:17866286672026-08-26redhat
redhatocp-tools-4/jenkins-rhel8:17866286812026-08-26redhat
redhatocp-tools-4/jenkins-rhel8:17865335612026-08-26redhat
redhatocp-tools-4/jenkins-rhel9:17871251662026-08-26redhat
redhatocp-tools-4/jenkins-rhel8:17865335652026-08-26redhat

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

(9 across 5 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
commons-httpclient3.1-16——
httpcomponents-client4.5.13-2, 4.5.13-3, 4.5.14-1——
Debian:12(2)
PackageVulnerable rangeFixed inDependents
commons-httpclient3.1-16——
httpcomponents-client4.5.14-1——
Debian:13(2)
PackageVulnerable rangeFixed inDependents
commons-httpclient3.1-16——
httpcomponents-client4.5.14-1——
Debian:14(2)
PackageVulnerable rangeFixed inDependents
commons-httpclient3.1-16——
httpcomponents-client4.5.14-1——
Maven(1)
PackageVulnerable rangeFixed inDependents
org.apache.httpcomponents.client5:httpclient55.0 ... 5.6.2 (46 versions)5.6.3—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 57× 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 112 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-64607?
CVE-2026-64607 is a medium vulnerability published on July 31, 2026. HttpClient based on the classic i/o model fails to correctly release the underlying connection back to the connection manager if it encounters an invalid or unsupported Content-Encoding header value in the response message. Please note this defect does not affect HttpClient based on the async i/o…
When was CVE-2026-64607 disclosed?
CVE-2026-64607 was first published in the National Vulnerability Database on July 31, 2026, with the most recent update on August 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64607 actively exploited?
CVE-2026-64607 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 59.3% of all scored CVEs.
What is the CVSS score of CVE-2026-64607?
CVE-2026-64607 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-64607?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64607, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-64607

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