{"id":"CVE-2026-28435","summary":"Payload size limit bypass via gzip decompression in ContentReader (streaming) allows oversized request bodies in cpp-httplib","details":"cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.35.0, cpp-httplib (httplib.h) does not enforce Server::set_payload_max_length() on the decompressed request body when using HandlerWithContentReader (streaming ContentReader) with Content-Encoding: gzip (or other supported encodings). A small compressed payload can expand beyond the configured payload limit and be processed by the application, enabling a payload size limit bypass and potential denial of service (CPU/memory exhaustion). This vulnerability is fixed in 0.35.0.","aliases":["GHSA-xvfx-w463-6fpp"],"modified":"2026-08-12T15:32:11.061975Z","published":"2026-03-04T19:36:33.418Z","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-400","CWE-409"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28435.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28435.json"},{"type":"ADVISORY","url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xvfx-w463-6fpp"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28435"},{"type":"FIX","url":"https://github.com/yhirose/cpp-httplib/commit/c99d7472b5cf4869d3897b9afc9792063a3d15a8"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/yhirose/cpp-httplib","events":[{"introduced":"0"},{"fixed":"85b18a9c6431877188a706ba3c61679fa9de3e27"},{"fixed":"c99d7472b5cf4869d3897b9afc9792063a3d15a8"}],"database_specific":{"cpe":"cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"0.35.0"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["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-2026-28435.json","vanir_signatures_modified":"2026-08-12T15:32:11Z","vanir_signatures":[{"source":"https://github.com/yhirose/cpp-httplib/commit/c99d7472b5cf4869d3897b9afc9792063a3d15a8","target":{"file":"httplib.h","function":"read_content"},"deprecated":false,"digest":{"function_hash":"74746730314336700382392421616361087673","length":1376},"id":"CVE-2026-28435-29ab28dd","signature_type":"Function","signature_version":"v1"},{"deprecated":false,"digest":{"length":2190,"function_hash":"3569740634388511840270561711140388394"},"id":"CVE-2026-28435-797167f0","signature_type":"Function","signature_version":"v1","source":"https://github.com/yhirose/cpp-httplib/commit/c99d7472b5cf4869d3897b9afc9792063a3d15a8","target":{"file":"httplib.h","function":"Server::routing"}},{"deprecated":false,"digest":{"function_hash":"27401325142482852988380135752401769151","length":924},"id":"CVE-2026-28435-9b30a385","signature_type":"Function","signature_version":"v1","source":"https://github.com/yhirose/cpp-httplib/commit/c99d7472b5cf4869d3897b9afc9792063a3d15a8","target":{"file":"httplib.h","function":"prepare_content_receiver"}},{"source":"https://github.com/yhirose/cpp-httplib/commit/c99d7472b5cf4869d3897b9afc9792063a3d15a8","target":{"file":"httplib.h"},"deprecated":false,"digest":{"threshold":0.9,"line_hashes":["336620093775998130083204534146315144902","48261278978696573782838737954150987740","25263993843790355181074608904646098856","270565861836672539415351342119216784964","307733686717758452394557357153091473703","241423657130170861817757171211232425161","277223009612079348722281460193068094464","289645906111598587169901904179132149177","288441847406440607085773995130574482900","6154085008139808168913825350636784842","254843035028795877504312647447110684640","48100023920598998605003155898859628559","61000319865907416719250901747454429058","164609337165507433469985209426698622152","323323656031063368219382194435717382538","339885592849685253453127287063162146111","229080025159869799351818857383716339213","315596621814371842598799807411962157247","299917188554656618663061553949547970981","298801253700645922171765926966072659129","24172106091241432159952864198178353426","698028545424733854233987376183115324","83842166720811206405484969212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