{"id":"CVE-2026-29076","summary":"cpp-httplib: Stack Overflow Denial of Service (DoS) via std::regex in multipart filename parsing","details":"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.","aliases":["GHSA-qq6v-r583-3h69"],"modified":"2026-08-12T15:32:14.761786Z","published":"2026-03-07T16:08:56.048Z","related":["SUSE-SU-2026:21599-1","openSUSE-SU-2026:10435-1","openSUSE-SU-2026:20733-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-1333","CWE-674"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29076.json"},"references":[{"type":"WEB","url":"https://github.com/yhirose/cpp-httplib/releases/tag/v0.37.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/29xxx/CVE-2026-29076.json"},{"type":"ADVISORY","url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qq6v-r583-3h69"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-29076"},{"type":"FIX","url":"https://github.com/yhirose/cpp-httplib/commit/de296af3eb5b0d5c116470e033db900e4812c5e6"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/yhirose/cpp-httplib","events":[{"introduced":"0"},{"fixed":"0d3a3d805c8979e3220b42fcbc0ff95980eabc06"},{"fixed":"de296af3eb5b0d5c116470e033db900e4812c5e6"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"0.37.0"}]}}],"versions":["v0.35.0","v0.34.0","latest","v0.33.1","v0.33.0","v0.32.0","v0.31.0","v0.30.2","v0.30.1","v0.30.0","v0.29.0","v0.28.0","v0.27.0","v0.26.0","v0.25.0","v0.24.0","v0.23.1","v0.23.0","v0.22.0","v0.21.0","v0.20.1","v0.20.0","v0.19.0","v0.18.7","v0.18.6","v0.18.5","v0.18.4","v0.18.3","v0.18.2","v0.18.1","v0.18.0","v0.17.3","v0.17.2","v0.17.1","v0.17.0","v0.16.3","v0.16.2","v0.16.1","v0.16.0","v0.15.3","v0.15.2","v0.15.1","v0.15.0","v0.14.3","v0.14.2","v0.14.1","v0.14.0","v0.13.3","v0.13.2","v0.13.1","v0.13.0","v0.12.6","v0.12.5","v0.12.4","v0.12.3","v0.12.2","v0.12.1","v0.12.0","v0.11.4","v0.11.3","v0.11.2","v0.11.1","v0.11.0","v0.10.9","v0.10.8","v0.10.7","v0.10.6","v0.10.5","v0.10.4","v0.10.3","v0.10.2","v0.10.1","v0.10.0","v0.9.10","v0.9.9","v0.9.8","v0.9.7","v0.9.6","v0.9.5","v0.9.4","v0.9.3","v0.9.2","v0.9.1","v0.9.0","v0.8.9","v0.8.8","v0.8.7","v0.8.6","v0.8.5","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.18","v0.7.17","v0.7.16","v0.7.15","v0.7.14","v0.7.13","v0.7.12","v0.7.11","v0.7.10","v0.7.9","v0.7.8","v0.7.7","v0.7.6","v0.7.5","v0.7.4","v0.7.3","v0.7.2","v0.7.1","v0.7.0","v0.6.7","v0.6.6","v0.6.5","v0.6.4","v0.6.3","v0.6.2","v0.6.1","v0.6.0","v0.5.13","v0.5.12","v0.5.11","v0.5.10","v0.5.9","v0.5.8","v0.5.7","v0.5.6","v0.5.5","v0.5.4","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.2","v0.4.1","v0.4.0","v0.3.3","v0.3.2","v0.3.1","v0.3.0","v0.2.6","v0.2.5","v0.2.4","v0.2.3","v0.2.2","v0.2.1","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-29076.json","vanir_signatures_modified":"2026-08-12T15:32:14Z","vanir_signatures":[{"deprecated":false,"digest":{"function_hash":"237936591402214651401279883398651361996","length":1108},"id":"CVE-2026-29076-554c16a0","signature_type":"Function","signature_version":"v1","source":"https://github.com/yhirose/cpp-httplib/commit/de296af3eb5b0d5c116470e033db900e4812c5e6","target":{"file":"test/test.cc","function":"TEST"}},{"signature_type":"Line","signature_version":"v1","source":"https://github.com/yhirose/cpp-httplib/commit/de296af3eb5b0d5c116470e033db900e4812c5e6","target":{"file":"test/test.cc"},"deprecated":false,"digest":{"line_hashes":["309024782862823533139338211795996186596","7839956594439321606962847164061496972","12687117214297278841990333245619558674","143994490375359120576663796943720785488","96208271181828219443939827392695470831","234674402923027064236410791687030770732","322492796322437330966953077832002777863","243898783827694880252824254507942876352"],"threshold":0.9},"id":"CVE-2026-29076-7606882b"},{"signature_version":"v1","source":"https://github.com/yhirose/cpp-httplib/commit/de296af3eb5b0d5c116470e033db900e4812c5e6","target":{"file":"httplib.h"},"deprecated":false,"digest":{"line_hashes":["283461347697145605990353131721631228646","317816394311432108134934590617596588190","260729738294240947720973995679438464087","92606262670744106618818917992551696386","758283165799264715444508233140374639","167685828088613054992179248988962440460","101730038497963474406760851837415666168","4886179887345815178455501738634573180","114384602934601073345597924936986340169","110186337317846723965865112085172832744","126759218069447842223487999870084534347","187208488398962529278613125758738484047","137054790988581298113428252414869384961","305920338525971726203288552478051009521","228300519572110876182238860862426601967","208931648635274734019654502913369448381","119198146933619949402160524817870803654","12382769242152171805705224765586807681","244547348337947176159043738983358464383","313086644932006488650364205763955723535","282884093883479764805603304034313241597","103189393625292220994570787459445843507","190412590663406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