{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-34441", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-27T18:18:14.894Z", "datePublished": "2026-03-31T21:21:33.197Z", "dateUpdated": "2026-04-01T15:53:07.782Z"}, "containers": {"cna": {"title": "cpp-httplib: HTTP Request Smuggling via Unconsumed GET Request Body", "problemTypes": [{"descriptions": [{"cweId": "CWE-444", "lang": "en", "description": "CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-jv63-rm9j-6jwc", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-jv63-rm9j-6jwc"}, {"name": "https://github.com/yhirose/cpp-httplib/releases/tag/v0.40.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/yhirose/cpp-httplib/releases/tag/v0.40.0"}], "affected": [{"vendor": "yhirose", "product": "cpp-httplib", "versions": [{"version": "< 0.40.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-31T21:21:33.197Z"}, "descriptions": [{"lang": "en", "value": "cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.40.0, cpp-httplib is vulnerable to HTTP Request Smuggling. The server's static file handler serves GET responses without consuming the request body. On HTTP/1.1 keep-alive connections, the unread body bytes remain on the TCP stream and are interpreted as the start of a new HTTP request. An attacker can embed an arbitrary HTTP request inside the body of a GET request, which the server processes as a separate request. This issue has been patched in version 0.40.0."}], "source": {"advisory": "GHSA-jv63-rm9j-6jwc", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-01T15:37:21.523498Z", "id": "CVE-2026-34441", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-01T15:53:07.782Z"}}]}}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.40.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "cpp-httplib", "source": "cna", "vendor": "yhirose"}, "product": "cpp-httplib", "vendor": "yhirose"}], "analysis": {"en": {"generated_at": "2026-04-02T05:14:31.377702+00:00", "value": {"mitigation_remediation": ["Upgrade cpp\u2011httplib to version 0.40.0 or newer"], "summary": {"action": "Immediate Patch", "impact": "HTTP Request Smuggling"}, "threat_synthesis": {"affected_systems": "The issue affects any installation of the yhirose:cpp\u2011httplib library prior to version 0.40.0. The library is a C++11 single-file header\u2011only cross\u2011platform HTTP/HTTPS library that may be used in custom web servers or backend services handling HTTP or HTTPS traffic.", "description_and_impact": "The vulnerability in the cpp\u2011httplib library causes the static file handler to return GET responses without consuming the request body. When a keep\u2011alive connection is used, the unread body bytes remain on the TCP stream and are later interpreted as the start of a new HTTP request. An attacker can embed an arbitrary HTTP request inside the body of a GET request, which the server processes as a separate request. This flaw results in HTTP Request Smuggling, allowing unintended request handling by the server.", "risk_and_exploitability": "The CVSS score of 4.8 classifies the vulnerability as moderate severity. With an EPSS score below 1% and no listing in the CISA KEV catalog, the likelihood of widespread exploitation appears low. The attack vector is remote; an adversary only needs to send a crafted HTTP request over a keep\u2011alive connection, without requiring authentication or elevated privileges. The vulnerability stems solely from improper consumption of the request body by the library\u2019s static file handler."}}}}, "created": "2026-04-02T07:52:11.190519+00:00", "updated": "2026-04-02T20:10:26.485647+00:00", "vendors": ["yhirose", "yhirose$PRODUCT$cpp-httplib"]}