Vulnerability-Lookup

CVE-2026-64607 (GCVE-0-2026-64607)

Vulnerability from cvelistv5 – Published: 2026-07-31 10:12 – Updated: 2026-08-13 16:18

Title

Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS

Summary

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.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-31 16:24 UTC

CWE

CWE-772 - Missing Release of Resource after Effective Lifetime

Assigner

apache mitre root

References

2 references

URL	Tags
https://lists.apache.org/thread/qqfzo3fqcdk4l5496…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/08/13/5

Impacted products

1 product

Vendor	Product	Version	CPE status
Apache Software Foundation	Apache HttpComponents Client	Affected: 5.0-alpha , ≤ 5.6.2 (semver)	guessed

Credits

Yu Bao from PayPal Cyber Security Team

Show details on NVD website

JSON

To clipboard

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CLEANSTART-2026-SK45406 (GHSA-R7WM-3CXJ-WFF9)

Vulnerability from cleanstart – Published: 2026-09-01 11:17 – Updated: 2026-09-18 11:59 – Source website

Withdrawn 2026-09-18

Summary

Security fixes in cassandra-reaper-fips 4.0.2-r3

Details

Package cassandra-reaper-fips version 4.0.2-r3 fixes 20 vulnerabilities: ghsa-r7wm-3cxj-wff9, ghsa-72hv-8253-57qq, CVE-2026-54512, CVE-2026-54513, CVE-2026-54514...

References

URL

Type

https://github.com/thelastpickle/cassandra-reaper

WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "cassandra-reaper-fips"
      },
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          "events": [
            {
              "introduced": "0"
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              "fixed": "4.0.2-r3"
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        }
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    "ghsa-72hv-8253-57qq",
    "CVE-2026-54512",
    "CVE-2026-54513",
    "CVE-2026-54514",
    "CVE-2026-59888",
    "CVE-2026-54515",
    "CVE-2026-44249",
    "CVE-2026-45416",
    "CVE-2026-50010",
    "CVE-2026-45536",
    "CVE-2026-45205",
    "CVE-2026-54399",
    "CVE-2026-54428",
    "CVE-2026-64607",
    "CVE-2026-2332",
    "CVE-2024-6763",
    "CVE-2025-11143",
    "CVE-2026-10050",
    "CVE-2026-6790"
  ],
  "withdrawn": "2026-09-18T11:59:01.768079Z"
}

CLEANSTART-2026-TM54369 (CVE-2026-54399)

Vulnerability from cleanstart – Published: 2026-09-01 11:17 – Updated: 2026-09-18 11:59 – Source website

Withdrawn 2026-09-18

Summary

Security fixes in spring-boot 4.0.7-r0

Details

Package spring-boot version 4.0.7-r0 fixes 3 vulnerabilities: CVE-2026-54399, CVE-2026-54428, CVE-2026-64607

References

URL

Type

https://spring.io/projects/spring-boot

WEB

JSON

To clipboard

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  "affected": [
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        "ecosystem": "CleanStart",
        "name": "spring-boot"
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        }
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  "credits": [],
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  "id": "CLEANSTART-2026-TM54369",
  "modified": "2026-09-18T11:59:01.768079Z",
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}

CLEANSTART-2026-US56197 (CVE-2026-64607)

Vulnerability from cleanstart – Published: 2026-09-01 11:17 – Updated: 2026-09-18 11:59 – Source website

Withdrawn 2026-09-18

Summary

Security fixes in elasticsearch 9.5.2-r2

Details

Package elasticsearch version 9.5.2-r2 fixes 3 vulnerabilities: CVE-2026-64607, CVE-2026-59903, CVE-2026-49844

References

URL

Type

https://www.elastic.co/products/elasticsearch

WEB

JSON

To clipboard

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  "references": [
    {
      "type": "WEB",
      "url": "https://www.elastic.co/products/elasticsearch"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "summary": "Security fixes in elasticsearch 9.5.2-r2",
  "upstream": [
    "CVE-2026-64607",
    "CVE-2026-59903",
    "CVE-2026-49844"
  ],
  "withdrawn": "2026-09-18T11:59:01.768079Z"
}

FKIE_CVE-2026-64607

Vulnerability from fkie_nvd - Published: 2026-07-31 11:17 - Updated: 2026-08-13 17:17

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

	URL	Tags
	security@apache.org	https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q	Mailing List, Release Notes
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/08/13/5

Impacted products

	Vendor	Product	Version
	apache	httpclient	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.maven.apache.org/maven2/",
          "defaultStatus": "unaffected",
          "packageName": "org.apache.httpcomponents.client5:httpclient5",
          "product": "Apache HttpComponents Client",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThanOrEqual": "5.6.2",
              "status": "affected",
              "version": "5.0-alpha",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@apache.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:apache:httpclient:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D5B8B944-BED3-4FAE-B271-8B9B8B22A15D",
              "versionEndExcluding": "5.6.3",
              "versionStartIncluding": "5.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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.\u00a0Please note this defect does not affect HttpClient based on the async i/o model.\n\nThis issue affects Apache HttpComponents Client: from 5.0-alpha1 through 5.6.2."
    }
  ],
  "id": "CVE-2026-64607",
  "lastModified": "2026-08-13T17:17:33.733",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-64607",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-31T16:24:59.439841Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-31T11:17:11.710",
  "references": [
    {
      "source": "security@apache.org",
      "tags": [
        "Mailing List",
        "Release Notes"
      ],
      "url": "https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/08/13/5"
    }
  ],
  "sourceIdentifier": "security@apache.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-772"
        }
      ],
      "source": "security@apache.org",
      "type": "Secondary"
    }
  ]
}

GHSA-HJCP-JMPX-G3QM

Vulnerability from github – Published: 2026-07-31 12:30 – Updated: 2026-08-13 18:40

Summary

Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS

Details

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.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.httpcomponents.client5:httpclient5"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0-alpha1"
            },
            {
              "fixed": "5.6.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-64607"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-772"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-13T18:40:18Z",
    "nvd_published_at": "2026-07-31T11:17:11Z",
    "severity": "MODERATE"
  },
  "details": "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.\u00a0Please note this defect does not affect HttpClient based on the async i/o model.\n\nThis issue affects Apache HttpComponents Client: from 5.0-alpha1 through 5.6.2.",
  "id": "GHSA-hjcp-jmpx-g3qm",
  "modified": "2026-08-13T18:40:18Z",
  "published": "2026-07-31T12:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64607"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/httpcomponents-client/commit/55733f4121f7ba26ddf04fe12739d9c15962cb94"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/httpcomponents-client/commit/ebac9512f555c4a355cad3f59ef2db69b597cc97"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/httpcomponents-client"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/httpcomponents-client/releases/tag/rel/v5.6.3"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/httpcomponents-client/releases/tag/rel/v5.7-alpha1"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/qqfzo3fqcdk4l5496vz95ppvl4ty511q"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/08/13/5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache HttpComponents Client: Connection Leak on Content-Encoding Decode Error Leads to Pool Exhaustion DoS"
}

OPENSUSE-SU-2026:11647-1

Vulnerability from csaf_opensuse - Published: 2026-08-30 00:00 - Updated: 2026-09-17 17:22

Summary

httpcomponents-client-4.5.14-2.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-64607.

CVE-2026-64607

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Recommended: 12 products

Open the full advisory

RHSA-2026:60239

Vulnerability from csaf_redhat - Published: 2026-08-26 10:22 - Updated: 2026-09-18 17:43

Summary

Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.15 security update.

Severity

Important

Scope

29 vulnerabilities in this advisory, including CVE-2026-64607.

CVE-2026-64607

A flaw was found in Apache HttpComponents Client, specifically in its classic input/output (I/O) model. When processing a response message with an invalid or unsupported `Content-Encoding` header, the client fails to properly release the underlying network connection. This connection leak can lead to the exhaustion of the connection pool, making the service unavailable and resulting in a Denial of Service (DoS) for legitimate users.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 4 products Known not affected: 4 products

https://access.redhat.com/errata/RHSA-2026:60239

Open the full advisory

RHSA-2026:60246

Vulnerability from csaf_redhat - Published: 2026-08-26 10:41 - Updated: 2026-09-18 17:43

Summary

Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.17 security update.

Severity

Important

Scope

29 vulnerabilities in this advisory, including CVE-2026-64607.

CVE-2026-64607

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 4 products Known not affected: 4 products

https://access.redhat.com/errata/RHSA-2026:60246

Open the full advisory

RHSA-2026:60247

Vulnerability from csaf_redhat - Published: 2026-08-26 10:45 - Updated: 2026-09-18 17:43

Summary

Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.12 security update.

Severity

Important

Scope

29 vulnerabilities in this advisory, including CVE-2026-64607.

CVE-2026-64607

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 1 product Known not affected: 1 product

https://access.redhat.com/errata/RHSA-2026:60247

Open the full advisory

RHSA-2026:60248

Vulnerability from csaf_redhat - Published: 2026-08-26 10:46 - Updated: 2026-09-18 17:43

Summary

Red Hat Security Advisory: Release of Red Hat OpenShift Developer Tools - Openshift Jenkins 4.14 security update.

Severity

Important

Scope

29 vulnerabilities in this advisory, including CVE-2026-64607.

CVE-2026-64607

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 4 products Known not affected: 4 products

https://access.redhat.com/errata/RHSA-2026:60248

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-64607 (GCVE-0-2026-64607)

CLEANSTART-2026-SK45406 (GHSA-R7WM-3CXJ-WFF9)

CLEANSTART-2026-TM54369 (CVE-2026-54399)

CLEANSTART-2026-US56197 (CVE-2026-64607)

FKIE_CVE-2026-64607

GHSA-HJCP-JMPX-G3QM

OPENSUSE-SU-2026:11647-1

RHSA-2026:60239

RHSA-2026:60246

RHSA-2026:60247

RHSA-2026:60248

Tags

Sightings

Nomenclature

Related by attack behaviour