tinyproxy Integer Overflow in HTTP Chunked Transfer-Encoding Parser Leading to Denial of Service

{
  "id": "c8a779a42f388d19a85b8214d31c903480a36111bf5f13ec5499a58f434216ba",
  "url": "https://osv.dev/vulnerability/CVE-2026-3945",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "tinyproxy Integer Overflow in HTTP Chunked Transfer-Encoding Parser Leading to Denial of Service",
    "summary": "An integer overflow vulnerability in the HTTP chunked transfer encoding parser in tinyproxy up to and including version 1.11.3 allows an unauthenticated remote attacker to cause a denial of service (DoS). The issue occurs because chunk size values are parsed using strtol without properly validating overflow conditions (e.g., errno == ERANGE).",
    "evidence": "osv:CVE-2026-3945",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-3945",
      "aliases": [
        "CVE-2026-3945"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/tinyproxy/tinyproxy",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "969852c"
                },
                {
                  "fixed": "bb7edc4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "1.11.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "969852c"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "bb7edc4"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3945.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.999904315Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3945.json",
        "https://github.com/tinyproxy/tinyproxy/releases",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-3945",
        "https://github.com/tinyproxy/tinyproxy/issues/602",
        "https://github.com/tinyproxy/tinyproxy/commit/969852c",
        "https://github.com/tinyproxy/tinyproxy/commit/bb7edc4",
        "https://github.com/tinyproxy/tinyproxy/pull/603"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-190"
        ],
        "cna_assigner": "TuranSec",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3945.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-3945",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518415,
  "published_at": "2026-03-30T07:05:23.295+00:00"
}