Vulnerability-Lookup

GHSA-V3JC-474W-2WM6

Vulnerability from github – Published: 2026-07-01 18:31 – Updated: 2026-08-13 18:27

Summary

Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK

Details

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.

Severity

7.5 (High)


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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.httpcomponents.core5:httpcore5-h2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.4.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.apache.httpcomponents.core5:httpcore5-h2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.5-alpha1"
            },
            {
              "fixed": "5.5-beta2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54428"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-13T18:27:16Z",
    "nvd_published_at": "2026-07-01T18:16:34Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-v3jc-474w-2wm6",
  "modified": "2026-08-13T18:27:16Z",
  "published": "2026-07-01T18:31:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54428"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/httpcomponents-core/commit/1ea1239bbbe3442a8382a87279c0a8119a7e358e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/httpcomponents-core/commit/cc30ee058a7b10cbf4ad3dd6270ab6d1f6a74c49"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/apache/httpcomponents-core"
    },
    {
      "type": "WEB",
      "url": "https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/01/3"
    }
  ],
  "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:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK"
}

CVE-2026-54428 (GCVE-0-2026-54428)

Vulnerability from cvelistv5 – Published: 2026-07-01 17:03 – Updated: 2026-07-01 18:15

Title

Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-01 18:15 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling
CWE-400 - Uncontrolled Resource Consumption

Assigner

apache mitre root Scorecard

References

2 references

URL	Tags
https://lists.apache.org/thread/5zjp8vczvxq19pw2r…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/07/01/3

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache HttpComponents Core	Affected: 5.5-alpha , ≤ 5.5-beta1 (maven) Affected: 5.0-alpha , ≤ 5.4.2 (maven)

Credits

Henry Huang <zhuang3@paypal.com>

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-07-01T17:36:48.420Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/07/01/3"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "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:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-54428",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-01T18:15:24.114171Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-01T18:15:56.634Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo.maven.apache.org/maven2/",
          "defaultStatus": "unaffected",
          "packageName": "org.apache.httpcomponents.core5:httpcore5-h2",
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          "vendor": "Apache Software Foundation",
          "versions": [
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              "version": "5.5-alpha",
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            },
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              "lessThanOrEqual": "5.4.2",
              "status": "affected",
              "version": "5.0-alpha",
              "versionType": "maven"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Henry Huang \u003czhuang3@paypal.com\u003e"
        }
      ],
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              "type": "text/html",
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            }
          ],
          "value": "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."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "text": "Important"
            },
            "type": "Textual description of severity"
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      "problemTypes": [
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          "descriptions": [
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              "lang": "en",
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        },
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-01T17:05:35.023Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
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      "references": [
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          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.apache.org/thread/5zjp8vczvxq19pw2rvhs21q446bhl0sd"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Apache HttpComponents Core: HPackDecoder Unlimited Header List Size Before SETTINGS ACK",
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  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
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    "datePublished": "2026-07-01T17:03:53.938Z",
    "dateReserved": "2026-06-14T09:39:30.814Z",
    "dateUpdated": "2026-07-01T18:15:56.634Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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.
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GHSA-V3JC-474W-2WM6

CVE-2026-54428 (GCVE-0-2026-54428)

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