CVE-2026-49975 (GCVE-0-2026-49975)

Vulnerability from cvelistv5 – Published: 2026-06-08 15:26 – Updated: 2026-06-18 10:29
VLAI
Title
Apache HTTP Server: mod_http2 denial of service
Summary
Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP requests. This issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.
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: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-789 - Memory Allocation with Excessive Size Value
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache HTTP Server Affected: 2.4.17 , ≤ 2.4.67 (semver)
Create a notification for this product.
Credits
Quang Luong of Calif.IO in collaboration with OpenAI Codex
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-06-08T22:32:35.729Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/06/03/3"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2026/06/msg00009.html"
          },
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/06/08/16"
          }
        ],
        "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-2026-49975",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-18T10:27:36.270403Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-18T10:29:04.207Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/EQSTLab/CVE-2026-49975"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Apache HTTP Server",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThanOrEqual": "2.4.67",
              "status": "affected",
              "version": "2.4.17",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Quang Luong of Calif.IO in collaboration with OpenAI Codex"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eMemory Allocation with Excessive Size Value vulnerability in Apache HTTP Server\u0027s mod_http leads to denial of service via malicious HTTP requests.\u003c/p\u003e\u003cp\u003eThis issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.\u003c/p\u003e\u003cp\u003e\u003cbr\u003e\u003c/p\u003e"
            }
          ],
          "value": "Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server\u0027s mod_http leads to denial of service via malicious HTTP requests.\n\nThis issue affects Apache HTTP Server: from 2.4.17 through 2.4.67."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "text": "moderate"
            },
            "type": "Textual description of severity"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-789",
              "description": "CWE-789 Memory Allocation with Excessive Size Value",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-08T15:26:04.674Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://httpd.apache.org/security/vulnerabilities_24.html"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-05-26T12:00:00.000Z",
          "value": "reported"
        },
        {
          "lang": "en",
          "time": "2026-05-27T12:00:00.000Z",
          "value": "fixed upstream in mod_h2 https://github.com/icing/mod_h2/commit/35c6e405390ed361189a82acd96675401ea5947c"
        },
        {
          "lang": "en",
          "time": "2026-06-02T12:00:00.000Z",
          "value": "fixed in 2.4.x by r1934882"
        },
        {
          "lang": "eng",
          "time": "2026-06-08T12:00:00.000Z",
          "value": "2.4.68 released"
        }
      ],
      "title": "Apache HTTP Server: mod_http2 denial of service",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2026-49975",
    "datePublished": "2026-06-08T15:26:04.674Z",
    "dateReserved": "2026-06-02T17:20:37.983Z",
    "dateUpdated": "2026-06-18T10:29:04.207Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-49975",
      "date": "2026-06-25",
      "epss": "0.10352",
      "percentile": "0.95135"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-49975\",\"sourceIdentifier\":\"security@apache.org\",\"published\":\"2026-06-08T16:16:44.223\",\"lastModified\":\"2026-06-10T19:36:37.510\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server\u0027s mod_http leads to denial of service via malicious HTTP requests.\\n\\nThis issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.\"}],\"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}]},\"weaknesses\":[{\"source\":\"security@apache.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-789\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.4.17\",\"versionEndExcluding\":\"2.4.68\",\"matchCriteriaId\":\"DD819875-456D-45A6-90C9-4EDA544029A4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:f5:nginx:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"1.29.8\",\"matchCriteriaId\":\"E4C30BEE-3999-49BA-B96B-127E0BE9E954\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://httpd.apache.org/security/vulnerabilities_24.html\",\"source\":\"security@apache.org\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/06/03/3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/06/08/16\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2026/06/msg00009.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2026/06/03/3\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2026/06/msg00009.html\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2026/06/08/16\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2026-06-08T22:32:35.729Z\"}}, {\"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-2026-49975\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-18T10:27:36.270403Z\"}}}], \"references\": [{\"url\": \"https://github.com/EQSTLab/CVE-2026-49975\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-09T15:25:45.811Z\"}}], \"cna\": {\"title\": \"Apache HTTP Server: mod_http2 denial of service\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Quang Luong of Calif.IO in collaboration with OpenAI Codex\"}], \"metrics\": [{\"other\": {\"type\": \"Textual description of severity\", \"content\": {\"text\": \"moderate\"}}}], \"affected\": [{\"vendor\": \"Apache Software Foundation\", \"product\": \"Apache HTTP Server\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.4.17\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"2.4.67\"}], \"defaultStatus\": \"unaffected\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2026-05-26T12:00:00.000Z\", \"value\": \"reported\"}, {\"lang\": \"en\", \"time\": \"2026-05-27T12:00:00.000Z\", \"value\": \"fixed upstream in mod_h2 https://github.com/icing/mod_h2/commit/35c6e405390ed361189a82acd96675401ea5947c\"}, {\"lang\": \"en\", \"time\": \"2026-06-02T12:00:00.000Z\", \"value\": \"fixed in 2.4.x by r1934882\"}, {\"lang\": \"eng\", \"time\": \"2026-06-08T12:00:00.000Z\", \"value\": \"2.4.68 released\"}], \"references\": [{\"url\": \"https://httpd.apache.org/security/vulnerabilities_24.html\", \"tags\": [\"vendor-advisory\"]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server\u0027s mod_http leads to denial of service via malicious HTTP requests.\\n\\nThis issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eMemory Allocation with Excessive Size Value vulnerability in Apache HTTP Server\u0027s mod_http leads to denial of service via malicious HTTP requests.\u003c/p\u003e\u003cp\u003eThis issue affects Apache HTTP Server: from 2.4.17 through 2.4.67.\u003c/p\u003e\u003cp\u003e\u003cbr\u003e\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-789\", \"description\": \"CWE-789 Memory Allocation with Excessive Size Value\"}]}], \"providerMetadata\": {\"orgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"shortName\": \"apache\", \"dateUpdated\": \"2026-06-08T15:26:04.674Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-49975\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-18T10:29:04.207Z\", \"dateReserved\": \"2026-06-02T17:20:37.983Z\", \"assignerOrgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"datePublished\": \"2026-06-08T15:26:04.674Z\", \"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.