{"id":"CVE-2025-53629","aliases":["DEBIAN-CVE-2025-53629","EUVD-2025-21055","OESA-2025-1839","OESA-2025-1840","OESA-2025-1841","OESA-2025-1842","OESA-2025-1843","SUSE-SU-2026:20600-1","UBUNTU-CVE-2025-53629","openSUSE-SU-2026:20295-1"],"status":"published","title":"cpp-httplib Unbounded Memory Allocation in Chunked/No-Length Requests Vulnerability","description":"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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00594,"percentile":0.48752,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-770"],"published":"2025-07-10T19:46:01Z","modified":"2026-10-28T11:02:06Z","fixes":[{"ecosystem":"Debian:13","package":"cpp-httplib","fixed_in":["0.18.7-1+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"cpp-httplib","fixed_in":["0.25.0+ds-3"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP1","package":"cpp-httplib","fixed_in":["0.22.0-2.oe2403sp1"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP2","package":"cpp-httplib","fixed_in":["0.22.0-2.oe2403sp2"],"sources":["osv"]},{"ecosystem":"openEuler:22.03-LTS-SP3","package":"cpp-httplib","fixed_in":["0.22.0-2.oe2203sp3"],"sources":["osv"]},{"ecosystem":"openEuler:22.03-LTS-SP4","package":"cpp-httplib","fixed_in":["0.22.0-2.oe2203sp4"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS","package":"cpp-httplib","fixed_in":["0.22.0-2.oe2403"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.11.4+ds-1","0.11.4+ds-1+deb12u1","0.11.4+ds-2","0.11.4+ds-3","0.13.1+ds-1","0.14.0+ds-1","0.14.1+ds-1","0.14.1+ds-2","0.14.2+ds-1","0.14.3+ds-1","0.14.3+ds-1.1","0.14.3+ds-1.1~exp1","0.15.3+ds-1","0.15.3+ds-2","0.15.3+ds-3","0.16.0+ds-1","0.16.3+ds-1","0.16.3+ds-2","0.18.0+ds-1","0.18.7-1","0.20.1+ds-3","0.25.0+ds-1","0.26.0+ds-2","0.41.0+ds-1","0.41.0+ds-2","0.41.0+ds-3","0.41.0+ds-3~bpo13+1"]},{"source":"osv","ecosystem":"Debian:13","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.18.7-1+deb13u1"}]}],"versions":["0.18.7-1"]},{"source":"osv","ecosystem":"Debian:14","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.25.0+ds-3"}]}],"versions":["0.18.7-1","0.20.1+ds-3","0.25.0+ds-1"]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP1","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22.0-2.oe2403sp1"}]}]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP2","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22.0-2.oe2403sp2"}]}]},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP3","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22.0-2.oe2203sp3"}]}]},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP4","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22.0-2.oe2203sp4"}]}]},{"source":"osv","ecosystem":"openEuler:24.03-LTS","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22.0-2.oe2403"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 16.0","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22.0-160000.4.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP applications 16.0","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22.0-160000.4.1"}]}],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.9+ds-1","0.9.10+ds-1","0.10.1+ds-1","0.10.2+ds-1","0.10.3+ds-1","0.10.3+ds-1ubuntu0.1~esm1","0.10.3+ds-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.13.1+ds-1ubuntu1","0.14.3+ds-1","0.14.3+ds-1.1","0.14.3+ds-1.1build1","0.14.3+ds-1.1build2","0.14.3+ds-1.1ubuntu0.1~esm1","0.14.3+ds-1.1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.7-1","0.18.7-1ubuntu0.25.10.1","0.18.7-1ubuntu0.25.10.2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:26.04:LTS","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.18.7-1","0.26.0+ds-2ubuntu2","0.26.0+ds-2ubuntu3","0.26.0+ds-2ubuntu3+esm1"]},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"cpp-httplib","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22.0-160000.4.1"}]}],"bundled":2}],"products":[{"vendor":"yhirose","product":"cpp-httplib"}],"references":[{"url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qjmq-h3cc-qv6w","tags":["x_refsource_CONFIRM","exploit","Exploit","Vendor Advisory","advisory","report"]},{"url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-j6p8-779x-p5pw","tags":["x_refsource_MISC","Not Applicable","advisory","report"]},{"url":"https://github.com/yhirose/cpp-httplib/commit/17ba303889b8d4d719be3879a70639ab653efb99","tags":["x_refsource_MISC","Patch","fix","report"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/53xxx/CVE-2025-53629.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-53629","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2025-53629","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1839","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1840","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1841","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1842","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1843","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202620600-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1246468","tags":["report"]},{"url":"https://bugzilla.suse.com/1246471","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2025-53628","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-53629","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2025-53629","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-53629","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-53629","title":"cpp-httplib Unbounded Memory Allocation in Chunked/No-Length Requests Vulnerability","description":"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.","status":"published","published":"2025-07-10T19:46:01.872Z","modified":"2025-07-10T20:19:21.578Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:32:48.853452Z"}],"euvd":[{"id":"EUVD-2025-21055","description":"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.","status":"published","published":"2025-07-10T19:46:01Z","modified":"2025-07-10T20:19:21Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T20:32:09.102762Z"}],"nvd":[{"id":"CVE-2025-53629","description":"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.","status":"published","published":"2025-07-10T20:15:27.37Z","modified":"2026-06-17T09:38:36.183Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:11:18.285862Z"}],"osv":[{"id":"CVE-2025-53629","title":"cpp-httplib Unbounded Memory Allocation in Chunked/No-Length Requests Vulnerability","description":"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.","status":"published","published":"2025-07-10T19:46:01.872Z","modified":"2026-10-28T11:02:06.427658601Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:44:50.45326Z"},{"id":"DEBIAN-CVE-2025-53629","description":"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.","status":"published","published":"2025-07-10T20:15:27.37Z","modified":"2026-09-01T20:05:53.871387799Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:47.378563Z"},{"id":"OESA-2025-1839","title":"cpp-httplib security update","description":"A C++11 single-file header-only cross platform HTTP/HTTPS library. It\u0026amp;apos;s extremely easy to setup. Just include httplib.h file in your code!\r\n\r\nSecurity Fix(es):\n\nCPP-HTTPLIB is a C++11 single file header that only cross-platform HTTP/HTTPS library. Prior to 0.23.0, incoming requests using transfer code: blocks in the title can arbitrarily allocate memory in the server, which may cause it to be exhausted. The vulnerability is fixed in 0.23.0. Note: This vulnerability is related to CVE-2025-53628.(CVE-2025-53629)","status":"published","published":"2025-07-18T11:08:55Z","modified":"2026-08-18T01:18:53.207851976Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:43.127925Z"},{"id":"OESA-2025-1840","title":"cpp-httplib security update","description":"A C++11 single-file header-only cross platform HTTP/HTTPS library. It\u0026amp;apos;s extremely easy to setup. Just include httplib.h file in your code!\r\n\r\nSecurity Fix(es):\n\nCPP-HTTPLIB is a C++11 single file header that only cross-platform HTTP/HTTPS library. Prior to 0.23.0, incoming requests using transfer code: blocks in the title can arbitrarily allocate memory in the server, which may cause it to be exhausted. The vulnerability is fixed in 0.23.0. Note: This vulnerability is related to CVE-2025-53628.(CVE-2025-53629)","status":"published","published":"2025-07-18T11:08:55Z","modified":"2026-08-18T01:18:53.956410004Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:43.127925Z"},{"id":"OESA-2025-1841","title":"cpp-httplib security update","description":"A C++11 single-file header-only cross platform HTTP/HTTPS library. It\u0026amp;apos;s extremely easy to setup. Just include httplib.h file in your code!\r\n\r\nSecurity Fix(es):\n\nCPP-HTTPLIB is a C++11 single file header that only cross-platform HTTP/HTTPS library. Prior to 0.23.0, incoming requests using transfer code: blocks in the title can arbitrarily allocate memory in the server, which may cause it to be exhausted. The vulnerability is fixed in 0.23.0. Note: This vulnerability is related to CVE-2025-53628.(CVE-2025-53629)","status":"published","published":"2025-07-18T11:08:55Z","modified":"2026-08-18T01:18:53.999284216Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:43.127925Z"},{"id":"OESA-2025-1842","title":"cpp-httplib security update","description":"A C++11 single-file header-only cross platform HTTP/HTTPS library. It\u0026amp;apos;s extremely easy to setup. Just include httplib.h file in your code!\r\n\r\nSecurity Fix(es):\n\nCPP-HTTPLIB is a C++11 single file header that only cross-platform HTTP/HTTPS library. Prior to 0.23.0, incoming requests using transfer code: blocks in the title can arbitrarily allocate memory in the server, which may cause it to be exhausted. The vulnerability is fixed in 0.23.0. Note: This vulnerability is related to CVE-2025-53628.(CVE-2025-53629)","status":"published","published":"2025-07-18T11:08:55Z","modified":"2026-08-18T01:18:53.811385508Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:43.127925Z"},{"id":"OESA-2025-1843","title":"cpp-httplib security update","description":"A C++11 single-file header-only cross platform HTTP/HTTPS library. It\u0026amp;apos;s extremely easy to setup. Just include httplib.h file in your code!\r\n\r\nSecurity Fix(es):\n\nCPP-HTTPLIB is a C++11 single file header that only cross-platform HTTP/HTTPS library. Prior to 0.23.0, incoming requests using transfer code: blocks in the title can arbitrarily allocate memory in the server, which may cause it to be exhausted. The vulnerability is fixed in 0.23.0. Note: This vulnerability is related to CVE-2025-53628.(CVE-2025-53629)","status":"published","published":"2025-07-18T11:08:55Z","modified":"2026-08-18T01:18:54.312084702Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:52:43.127925Z"},{"id":"UBUNTU-CVE-2025-53629","description":"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.","status":"published","published":"2025-07-10T20:15:00Z","modified":"2026-06-25T13:30:09.743821889Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:55:50.31802Z"},{"id":"openSUSE-SU-2026:20295-1","title":"Security update for cpp-httplib","description":"This update for cpp-httplib fixes the following issues:\n\n- CVE-2025-53629: header can allocate memory arbitrarily in the server, potentially leading to its exhaustion\n  (bsc#1246471).\n- CVE-2025-53628: HTTP header smuggling due to insecure trailers merge (bsc#1246468).\n","status":"published","published":"2026-03-02T10:20:20Z","modified":"2026-03-23T04:54:49.98121Z","updated_at":"2026-11-02T16:58:41.463445Z"},{"id":"SUSE-SU-2026:20600-1","title":"Security update for cpp-httplib","description":"This update for cpp-httplib fixes the following issues:\n\n- CVE-2025-53629: header can allocate memory arbitrarily in the server, potentially leading to its exhaustion\n  (bsc#1246471).\n- CVE-2025-53628: HTTP header smuggling due to insecure trailers merge (bsc#1246468).\n","status":"published","published":"2026-03-02T10:16:12Z","modified":"2026-03-23T04:53:04.002056Z","updated_at":"2026-11-02T15:54:01.953589Z"}]}}