HTTP Response splitting in multiple modules in Apache HTTP Server allows an attacker that can inject malicious response headers into backend applications to cause an HTTP desynchronization attack

{
  "id": "aa8dbd7dcee44fee3fd27b0e6ab5a2ea5721eb585fad77b83bcc38297091a9e0",
  "url": "https://osv.dev/vulnerability/CLEANSTART-2026-PP94302",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "HTTP Response splitting in multiple modules in Apache HTTP Server allows an attacker that can inject malicious response headers into backend applications to cause an HTTP desynchronization attack",
    "summary": "Security vulnerability affects the apache2 package. HTTP Response splitting in multiple modules in Apache HTTP Server allows an attacker that can inject malicious response headers into backend applications to cause an HTTP desynchronization attack.",
    "evidence": "osv:CLEANSTART-2026-PP94302",
    "products": [
      {
        "name": {
          "value": "apache2",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "2.4.59-r0",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CLEANSTART-2026-PP94302",
      "aliases": [
        "CLEANSTART-2026-PP94302"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2.4.59-r0"
                }
              ]
            }
          ],
          "package": {
            "name": "apache2",
            "purl": "pkg:apk/cleanstart/apache2",
            "ecosystem": "CleanStart"
          },
          "database_specific": {
            "source": "https://github.com/cleanstart-dev/cleanstart-security-advisories/blob/main/advisories/2026/CLEANSTART-2026-PP94302.json"
          }
        }
      ],
      "modified": "2026-10-09T01:00:19.944759048Z",
      "provider": "osv",
      "upstream": [
        "CVE-2024-24795"
      ],
      "references": [
        "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-PP94302.json",
        "https://osv.dev/vulnerability/CVE-2024-24795",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-24795"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2024-24795",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 108186,
  "published_at": "2026-10-09T00:49:51.934+00:00"
}