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    "cveMetadata": {
        "cveId": "CVE-2026-45352",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-05-11T21:40:08.178Z",
        "datePublished": "2026-05-29T19:14:08.065Z",
        "dateUpdated": "2026-06-02T01:52:12.106Z"
    },
    "containers": {
        "cna": {
            "title": "cpp-httplib DoS: Negative chunk-size in chunked Transfer-Encoding",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-20",
                            "lang": "en",
                            "description": "CWE-20: Improper Input Validation",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1285",
                            "lang": "en",
                            "description": "CWE-1285: Improper Validation of Specified Index, Position, or Offset in Input",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-770",
                            "lang": "en",
                            "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "LOW",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM",
                        "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:L",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h6wq-j5mv-f3q8",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h6wq-j5mv-f3q8"
                }
            ],
            "affected": [
                {
                    "vendor": "yhirose",
                    "product": "cpp-httplib",
                    "versions": [
                        {
                            "version": "< 0.43.4",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
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                "shortName": "GitHub_M",
                "dateUpdated": "2026-05-29T19:15:42.208Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.43.4, negative chunk-size in chunked Transfer-Encoding causes unbounded memory allocation and process crash. The ChunkedDecoder::read_payload function in cpp-httplib (httplib.h) parses the chunk-size field of HTTP chunked transfer encoding using std::strtoul(). Per the C standard (§7.22.1.4), strtoul silently accepts a leading minus sign, performing unsigned wrap-around: strtoul(\"-2\", …, 16) returns ULONG_MAX − 1 (0xFFFFFFFFFFFFFFFE). The library's only guard (line 12833) rejects ULONG_MAX (the result of \"-1\"), but any other negative value such as \"-2\" passes validation. The resulting near-maximum value is stored in chunk_remaining and controls how many bytes the server's read loop consumes from the network. This vulnerability is fixed in 0.43.4."
                }
            ],
            "source": {
                "advisory": "GHSA-h6wq-j5mv-f3q8",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h6wq-j5mv-f3q8",
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                "metrics": [
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                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-06-02T01:51:40.756562Z",
                                "id": "CVE-2026-45352",
                                "options": [
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                                        "Exploitation": "poc"
                                    },
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                                        "Automatable": "yes"
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                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                ],
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