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{"cveTags": [], "descriptions": [{"lang": "en", "value": "cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.37.0, cpp-httplib uses std::regex (libstdc++) to parse RFC 5987 encoded filename* values in multipart Content-Disposition headers. The regex engine in libstdc++ implements backtracking via deep recursion, consuming one stack frame per input character. An attacker can send a single HTTP POST request with a crafted filename* parameter that causes uncontrolled stack growth, resulting in a stack overflow (SIGSEGV) that crashes the server process. This issue has been patched in version 0.37.0."}], "id": "CVE-2026-29076", "lastModified": "2026-03-09T13:35:07.393", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-07T16:15:54.193", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/yhirose/cpp-httplib/commit/de296af3eb5b0d5c116470e033db900e4812c5e6"}, {"source": "security-advisories@github.com", "url": "https://github.com/yhirose/cpp-httplib/releases/tag/v0.37.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qq6v-r583-3h69"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-674"}, {"lang": "en", "value": "CWE-1333"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "cpp-httplib: cpp-httplib: Denial of Service via crafted HTTP POST request", "id": "2445491", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445491"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1333", "details": ["A flaw was found in cpp-httplib, a C++11 single-file header-only cross-platform HTTP/HTTPS library. A remote attacker can exploit this vulnerability by sending a specially crafted HTTP POST request with a malicious filename* parameter in the Content-Disposition header. This triggers uncontrolled stack growth due to the std::regex engine's deep recursion, leading to a stack overflow and causing the server process to crash, resulting in a Denial of Service (DoS)."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-29076", "public_date": "2026-03-07T16:08:56Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-29076\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-29076\nhttps://github.com/yhirose/cpp-httplib/commit/de296af3eb5b0d5c116470e033db900e4812c5e6\nhttps://github.com/yhirose/cpp-httplib/releases/tag/v0.37.0\nhttps://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qq6v-r583-3h69"], "statement": "The vulnerability CVE-2026-29076 is of MODERATE impact. It affects applications utilizing the `cpp-httplib` library to parse multipart `Content-Disposition` headers, specifically when handling `filename*` values. A remote attacker can send a crafted HTTP POST request, leading to a stack overflow and denial of service in the server process. This issue primarily impacts services that accept and process such multipart requests.", "threat_severity": "Moderate"}