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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*", "matchCriteriaId": "4FC168D9-1A5B-44C8-BE39-60BA37CFA451", "versionEndExcluding": "0.37.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.37.1, when a cpp-httplib client uses the streaming API (httplib::stream::Get, httplib::stream::Post, etc.), the library calls std::stoull() directly on the Content-Length header value received from the server with no input validation and no exception handling. std::stoull throws std::invalid_argument for non-numeric strings and std::out_of_range for values exceeding ULLONG_MAX. Since nothing catches these exceptions, the C++ runtime calls std::terminate(), which kills the process with SIGABRT. Any server the client connects to \u2014 including servers reached via HTTP redirects, third-party APIs, or man-in-the-middle positions can crash the client application with a single HTTP response. No authentication is required. No interaction from the end user is required. The crash is deterministic and immediate. This vulnerability is fixed in 0.37.1."}, {"lang": "es", "value": "cpp-httplib es una biblioteca HTTP/HTTPS multiplataforma de un solo archivo y solo de cabecera para C++11. Antes de la versi\u00f3n 0.37.1, cuando un cliente cpp-httplib utiliza la API de streaming (httplib::stream::Get, httplib::stream::Post, etc.), la biblioteca llama directamente a std::stoull() sobre el valor del encabezado Content-Length recibido del servidor sin validaci\u00f3n de entrada y sin manejo de excepciones. std::stoull lanza std::invalid_argument para cadenas no num\u00e9ricas y std::out_of_range para valores que exceden ULLONG_MAX. Dado que nada captura estas excepciones, el tiempo de ejecuci\u00f3n de C++ llama a std::terminate(), lo que termina el proceso con SIGABRT. Cualquier servidor al que se conecte el cliente \u2014incluidos los servidores alcanzados a trav\u00e9s de redirecciones HTTP, APIs de terceros o posiciones de man-in-the-middle\u2014 puede bloquear la aplicaci\u00f3n cliente con una \u00fanica respuesta HTTP. No se requiere autenticaci\u00f3n. No se requiere interacci\u00f3n del usuario final. El bloqueo es determinista e inmediato. Esta vulnerabilidad se corrige en la versi\u00f3n 0.37.1."}], "id": "CVE-2026-31870", "lastModified": "2026-03-18T15:36:20.990", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-11T18:16:26.487", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-39q5-hh6x-jpxx"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-248"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "cpp-httplib: cpp-httplib: Denial of Service via malformed Content-Length header", "id": "2446713", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2446713"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1287", "details": ["A flaw was found in cpp-httplib. A remote attacker, acting as a malicious server or through a man-in-the-middle position, can send a specially crafted HTTP response with a malformed Content-Length header. This lack of input validation and exception handling causes the client application to crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-31870", "public_date": "2026-03-11T17:57:49Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31870\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31870\nhttps://github.com/yhirose/cpp-httplib/security/advisories/GHSA-39q5-hh6x-jpxx"], "statement": "This IMPORTANT vulnerability in cpp-httplib allows a remote attacker, acting as a malicious server or through a man-in-the-middle position, to trigger a denial of service in client applications utilizing the streaming API. The flaw occurs due to insufficient input validation of the Content-Length header, leading to an application crash. No authentication or user interaction is required for successful exploitation. This affects Red Hat Community Projects that incorporate cpp-httplib, such as those in EPEL and Fedora.", "threat_severity": "Important"}

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