GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-54399 (GCVE-0-2026-54399)

Vulnerability from cvelistv5 – Published: 2026-07-01 17:02 – Updated: 2026-07-01 17:36
VLAI
Title
Apache HttpComponents Core: Unbounded HTTP Header/Line Length in Default Configuration
Summary
Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser 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 messages with excessive number of headers / excessive header length
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: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-01 17:34 UTC
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
Vendor Product Version CPE status
Apache Software Foundation Apache HttpComponents Core Affected: 5.5-alpha , ≤ 5.5-beta1 (maven)
Affected: 5.0-alpha , ≤ 5.4.2 (maven)
guessed Create a notification for this product.
Credits
Henry Huang <zhuang3@paypal.com>
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "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-2026-54399",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-01T17:34:34.579868Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-01T17:34:49.559Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2026-07-01T17:36:47.358Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/07/01/4"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo.maven.apache.org/maven2/",
          "defaultStatus": "unaffected",
          "packageName": "org.apache.httpcomponents.core5:httpcore5",
          "product": "Apache HttpComponents Core",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThanOrEqual": "5.5-beta1",
              "status": "affected",
              "version": "5.5-alpha",
              "versionType": "maven"
            },
            {
              "lessThanOrEqual": "5.4.2",
              "status": "affected",
              "version": "5.0-alpha",
              "versionType": "maven"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Henry Huang \u003czhuang3@paypal.com\u003e"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eUncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser\u0026nbsp;in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows\u0026nbsp;an remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive header length\u003c/p\u003e\u003cp\u003e\u003c/p\u003e"
            }
          ],
          "value": "Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser\u00a0in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows\u00a0an remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive header length"
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "text": "important"
            },
            "type": "Textual description of severity"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400 Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-01T17:06:01.449Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.apache.org/thread/zmxh1pl2zohov5ntdh4lt85gfrlchgpy"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Apache HttpComponents Core: Unbounded HTTP Header/Line Length in Default Configuration",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2026-54399",
    "datePublished": "2026-07-01T17:02:21.778Z",
    "dateReserved": "2026-06-13T10:04:54.084Z",
    "dateUpdated": "2026-07-01T17:36:47.358Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-54399",
      "date": "2026-09-16",
      "epss": "0.0087",
      "percentile": "0.5701"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-54399\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2026-07-01T17:16:36.357\",\"lastModified\":\"2026-07-24T20:04:03.387\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser\u00a0in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows\u00a0an remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive header length\"}],\"affected\":[{\"source\":\"security@apache.org\",\"affectedData\":[{\"vendor\":\"Apache Software Foundation\",\"product\":\"Apache HttpComponents Core\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://repo.maven.apache.org/maven2/\",\"packageName\":\"org.apache.httpcomponents.core5:httpcore5\",\"versions\":[{\"version\":\"5.5-alpha\",\"lessThanOrEqual\":\"5.5-beta1\",\"versionType\":\"maven\",\"status\":\"affected\"},{\"version\":\"5.0-alpha\",\"lessThanOrEqual\":\"5.4.2\",\"versionType\":\"maven\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-07-01T17:34:34.579868Z\",\"id\":\"CVE-2026-54399\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security@apache.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-400\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:httpcomponents_core:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.0\",\"versionEndIncluding\":\"5.4.2\",\"matchCriteriaId\":\"A8EEC5B5-1DF7-46C6-BDF1-682D12E33F04\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:httpcomponents_core:5.5:alpha1:*:*:*:*:*:*\",\"matchCriteriaId\":\"3A6F1338-5376-4581-AF9B-202B62133A9F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:httpcomponents_core:5.5:beta1:*:*:*:*:*:*\",\"matchCriteriaId\":\"860D474E-62CA-463F-AD9A-B7C44C148CD2\"}]}]}],\"references\":[{\"url\":\"https://lists.apache.org/thread/zmxh1pl2zohov5ntdh4lt85gfrlchgpy\",\"source\":\"security@apache.org\",\"tags\":[\"Mailing List\",\"Vendor Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/07/01/4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-16T17:23:14+00:00",
      "cve": "CVE-2026-54399",
      "id": "CVE-2026-54399",
      "initial_release_date": "2026-07-01T17:02:21.778000+00:00",
      "product_status:fixed": "55",
      "product_status:known_affected": "38",
      "product_status:known_not_affected": "131",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "org.apache.httpcomponents.core5/httpcore5: Apache HttpComponents Core: Denial of Service via excessive HTTP headers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54399.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-31T16:39:39Z",
      "cve": "CVE-2026-54399",
      "id": "CVE-2026-54399",
      "initial_release_date": "2026-07-03T03:02:46Z",
      "product_status:known_not_affected": "31",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-54399",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-54399.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2026/07/01/4\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2026-07-01T17:36:47.358Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-54399\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-01T17:34:34.579868Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-01T17:34:31.659Z\"}}], \"cna\": {\"title\": \"Apache HttpComponents Core: Unbounded HTTP Header/Line Length in Default Configuration\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Henry Huang \u003czhuang3@paypal.com\u003e\"}], \"metrics\": [{\"other\": {\"type\": \"Textual description of severity\", \"content\": {\"text\": \"important\"}}}], \"affected\": [{\"vendor\": \"Apache Software Foundation\", \"product\": \"Apache HttpComponents Core\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.5-alpha\", \"versionType\": \"maven\", \"lessThanOrEqual\": \"5.5-beta1\"}, {\"status\": \"affected\", \"version\": \"5.0-alpha\", \"versionType\": \"maven\", \"lessThanOrEqual\": \"5.4.2\"}], \"packageName\": \"org.apache.httpcomponents.core5:httpcore5\", \"collectionURL\": \"https://repo.maven.apache.org/maven2/\", \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://lists.apache.org/thread/zmxh1pl2zohov5ntdh4lt85gfrlchgpy\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Uncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser\\u00a0in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows\\u00a0an remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive header length\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eUncontrolled Resource Consumption vulnerability in the HTTP/1.1 message parser\u0026nbsp;in Apache HttpComponents Core (5.4.2 and earlier, 5.5-beta1 and earlier) allows\u0026nbsp;an remote attacker to cause a denial of service through memory exhaustion by sending messages with excessive number of headers / excessive header length\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400 Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"shortName\": \"apache\", \"dateUpdated\": \"2026-07-01T17:06:01.449Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-54399\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-01T17:36:47.358Z\", \"dateReserved\": \"2026-06-13T10:04:54.084Z\", \"assignerOrgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"datePublished\": \"2026-07-01T17:02:21.778Z\", \"assignerShortName\": \"apache\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


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.