CVE-2026-64607

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH 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
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.

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(high)
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
29%
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(1)

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

Affected Packages

(8 across 4 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——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× 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.

  1. 2026-08-20 23:32 UTCEG score recompute
  2. 2026-08-20 22:55 UTCEPSS rescore
  3. 2026-08-19 22:42 UTCEG score recompute
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-18 21:51 UTCEG score recompute
  6. 2026-08-18 13:48 UTCEPSS rescore
  7. 2026-08-17 21:00 UTCEG score recompute
  8. 2026-08-17 13:47 UTCEPSS rescore
  9. 2026-08-16 20:10 UTCEG score recompute
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-15 19:20 UTCEG score recompute
  12. 2026-08-15 01:30 UTCEPSS rescore
  13. 2026-08-14 18:29 UTCEG score recompute
  14. 2026-08-13 22:00 UTCEPSS rescore
  15. 2026-08-13 17:38 UTCGHSA enrichment
  16. 2026-08-13 16:38 UTCGHSA enrichment
  17. 2026-08-13 09:21 UTCGHSA enrichment
  18. 2026-08-12 16:11 UTCEG score recompute
  19. 2026-08-12 16:11 UTCGHSA enrichment
  20. 2026-08-12 13:51 UTCEPSS rescore
  21. 2026-08-11 15:20 UTCEG score recompute
  22. 2026-08-11 15:20 UTCGHSA enrichment
  23. 2026-08-11 00:00 UTCEPSS rescore
  24. 2026-08-10 14:30 UTCGHSA enrichment
  25. 2026-08-09 17:35 UTCEG score recompute
Show 32 more
  1. 2026-08-09 17:35 UTCGHSA enrichment
  2. 2026-08-09 13:47 UTCEPSS rescore
  3. 2026-08-08 16:45 UTCEG score recompute
  4. 2026-08-08 16:45 UTCGHSA enrichment
  5. 2026-08-08 16:37 UTCEPSS rescore
  6. 2026-08-07 15:54 UTCGHSA enrichment
  7. 2026-08-06 15:04 UTCEG score recompute
  8. 2026-08-06 15:04 UTCGHSA enrichment
  9. 2026-08-06 13:47 UTCEPSS rescore
  10. 2026-08-05 19:17 UTCEPSS rescore
  11. 2026-08-05 19:17 UTCEPSS rescore
  12. 2026-08-05 14:12 UTCEG score recompute
  13. 2026-08-05 14:11 UTCGHSA enrichment
  14. 2026-08-04 15:10 UTCEPSS rescore
  15. 2026-08-04 12:34 UTCEG score recompute
  16. 2026-08-04 12:34 UTCGHSA enrichment
  17. 2026-08-04 10:39 UTCEPSS rescore
  18. 2026-08-03 20:06 UTCEG score recompute
  19. 2026-08-03 20:06 UTCGHSA enrichment
  20. 2026-08-03 10:36 UTCEPSS rescore
  21. 2026-08-02 19:15 UTCEG score recompute
  22. 2026-08-02 19:15 UTCGHSA enrichment
  23. 2026-08-02 02:27 UTCEPSS rescore
  24. 2026-08-01 18:25 UTCEG score recompute
  25. 2026-08-01 18:25 UTCGHSA enrichment
  26. 2026-07-31 17:34 UTCGHSA enrichment
  27. 2026-07-31 17:00 UTCEG score recompute▲ 5.30
  28. 2026-07-31 17:00 UTCGHSA enrichment
  29. 2026-07-31 16:58 UTCMITRE cvelistV5CVSS v3 → 5.3 · severity → MEDIUM
  30. 2026-07-31 11:24 UTCNVD update
  31. 2026-07-31 10:18 UTCEG score recompute
  32. 2026-07-31 10:18 UTCMITRE cvelistV5first tracked

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 70.8% 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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