CVE-2026-110354

{
  "id": "CVE-2026-110354",
  "sourceIdentifier": "[email protected]",
  "published": "2026-10-22T03:16:31.427",
  "lastModified": "2026-10-22T19:17:35.660",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "HAProxy",
          "product": "HAProxy",
          "defaultStatus": "unaffected",
          "modules": [
            "mux-h1"
          ],
          "programFiles": [
            "src/h1_htx.c"
          ],
          "programRoutines": [
            {
              "name": "h1_parse_msg_data"
            }
          ],
          "repo": "https://git.haproxy.org/git/haproxy.git",
          "versions": [
            {
              "version": "3.0.0",
              "lessThan": "3.0.30",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "3.2.0",
              "lessThan": "3.2.26",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "3.3.0",
              "lessThan": "3.3.17",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "3.4.0",
              "lessThan": "3.4.6",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "3.5-dev",
              "lessThan": "3.5-dev9",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "HAProxy",
          "product": "HAProxy Enterprise Edition",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "3.0r1",
              "lessThan": "3.0r1-362.1441",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "3.2r1",
              "lessThan": "3.2r1-378.1259",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "3.3r1",
              "lessThan": "3.3r1-377.1005",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "HAProxy Technologies",
          "product": "HAProxy Kubernetes Ingress Controller",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "3.2.0",
              "lessThan": "3.2.17",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "HAProxy Technologies",
          "product": "Kubernetes Ingress Controller Enterprise",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "3.2.0",
              "lessThan": "3.2.17-ee1",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "3.0",
              "lessThan": "3.0.16-ee17",
              "versionType": "custom",
              "status": "affected"
            },
            {
              "version": "1.11",
              "lessThan": "1.11.14-ee11",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "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": "2026-10-22T13:43:28.678756Z",
          "id": "CVE-2026-110354",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-835"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.haproxy.org/?p=haproxy.git;a=commit;h=077906da140a35873bf451d7e9f67646c9f37c81",
      "source": "[email protected]"
    }
  ]
}