{"id":"CVE-2025-53629","summary":"cpp-httplib Unbounded Memory Allocation in Chunked/No-Length Requests Vulnerability","details":"cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.23.0, incoming requests using Transfer-Encoding: chunked in the header can allocate memory arbitrarily in the server, potentially leading to its exhaustion. This vulnerability is fixed in 0.23.0. NOTE: This vulnerability is related to CVE-2025-53628.","modified":"2026-08-12T15:16:39.912416Z","published":"2025-07-10T19:46:01.872Z","related":["GHSA-j6p8-779x-p5pw","GHSA-qjmq-h3cc-qv6w","SUSE-SU-2026:20600-1","openSUSE-SU-2026:20295-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/53xxx/CVE-2025-53629.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/53xxx/CVE-2025-53629.json"},{"type":"ADVISORY","url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-j6p8-779x-p5pw"},{"type":"ADVISORY","url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qjmq-h3cc-qv6w"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-53629"},{"type":"FIX","url":"https://github.com/yhirose/cpp-httplib/commit/17ba303889b8d4d719be3879a70639ab653efb99"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/yhirose/cpp-httplib","events":[{"introduced":"0"},{"fixed":"ecfd84c1712b1bfe92107e37843f97ecec537da9"},{"fixed":"17ba303889b8d4d719be3879a70639ab653efb99"}],"database_specific":{"cpe":"cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"0.23.0"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["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-2025-53629.json","vanir_signatures_modified":"2026-08-12T15:16:39Z","vanir_signatures":[{"deprecated":false,"digest":{"line_hashes":["205226579118729805217032180192572666325","288326940859781463957734342028996878695","297363821923707760301441192804047150422","306354135440132806753468599416133555670","332961119277007769851213870930383911487","218006389939506568329658419390594466106","140021593573549170605239541653318080358","120576207178700527404694121735721518876","53237574012263135774486892352033226510","292634964069883026736939148290991205255","307015537166185343876694251539742520392","132516790775411026159359503908778088653","169837434549799774299341236548756316779","292335094172956404578648148576097864303","259254892090884070752440449394210209075","164380346724209714837267416781148998330","59423945478876370211613438286834497724","179017214993518399257847108043015089395","247055664394971458722388735134688385937","142383695468159561099580613468756248028","304167139755899475484609117919485067791","271218819453716100754564275103897560218","93695726838761958007818518629843454012","49850466351355713629992903153275447867","269529242931526513953273825685870424713","246341959574433841927344090040453605083","104200263907913986650594648025431208928","201599137572375611230894186625871262686","34454009186070578903854342300730811724","23222426063267238159999575072059450696","279196033155740987593201962810448484335","111661590877232261277549872926427177169","196912973415306529857786817635776453596"],"threshold":0.9},"id":"CVE-2025-53629-51536f41","signature_type":"Line","signature_version":"v1","source":"https://github.com/yhirose/cpp-httplib/commit/17ba303889b8d4d719be3879a70639ab653efb99","target":{"file":"httplib.h"}},{"signature_version":"v1","source":"https://github.com/yhirose/cpp-httplib/commit/17ba303889b8d4d719be3879a70639ab653efb99","target":{"file":"httplib.h","function":"read_content_chunked"},"deprecated":false,"digest":{"function_hash":"300647741648752637084487631199956454766","length":1475},"id":"CVE-2025-53629-d6331234","signature_type":"Function"},{"deprecated":false,"digest":{"line_hashes":["71835222838686621250286688722251933616","276584867859912751115153440147786483036","291578792499164081159744552859857304325","116780648414751796823354903953399496260","28903644015235834629488627795843466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