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CVE-2026-64607 medium CVSS 5.3

Vulnerability in org.apache.httpcomponents.client5:httpclient5 (CVE-2026-64607)

Summary

Vulnerability in org.apache.httpcomponents.client5:httpclient5 (CVE-2026-64607). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 5.6.3 or later.

Original description

The description as published by the source.

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.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-64607 has been found in org.apache.httpcomponents.client5:httpclient5.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: upgrade org.apache.httpcomponents.client5:httpclient5 to 5.6.3 or later.
If unsure, ask your IT team or search "org.apache.httpcomponents.client5:httpclient5 CVE-2026-64607" on the vendor's site.

CVE-2026-64607 (org.apache.httpcomponents.client5:httpclient5) — CWE-772 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 5.6.3 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-772) exists in org.apache.httpcomponents.client5:httpclient5.

📍 Affected scope

Check the vendor advisory for the affected versions of org.apache.httpcomponents.client5:httpclient5.

🔥 Severity

Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 5.6.3.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで org.apache.httpcomponents.client5:httpclient5 を使っているサービスとバージョンを洗い出す。

  2. 2
    Apply patch patch 
    Upgrade org.apache.httpcomponents.client5:httpclient5 to 5.6.3

    ステージング環境で 5.6.3 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

maven org.apache.httpcomponents.client5:httpclient5
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.6.3"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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