An update for cpp-httplib is now available for openEuler-24.03-LTS-SP3 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-1554 Final 1.0 1.0 2026-03-15 Initial 2026-03-15 2026-03-15 openEuler SA Tool V1.0 2026-03-15 cpp-httplib security update An update for cpp-httplib is now available for openEuler-24.03-LTS-SP3 A C++11 single-file header-only cross platform HTTP/HTTPS library. It's extremely easy to setup. Just include httplib.h file in your code! Security Fix(es): cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.35.0, when a request handler throws a C++ exception and the application has not registered a custom exception handler via set_exception_handler(), the library catches the exception and writes its message directly into the HTTP response as a header named EXCEPTION_WHAT. This header is sent to whoever made the request, with no authentication check and no special configuration required to trigger it. The behavior is on by default. A developer who does not know to opt in to set_exception_handler() will ship a server that leaks internal exception messages to any client. This vulnerability is fixed in 0.35.0.(CVE-2026-28434) 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.(CVE-2026-28435) 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.(CVE-2026-29076) An update for cpp-httplib is now available for master/openEuler-22.03-LTS-SP4/openEuler-24.03-LTS/openEuler-24.03-LTS-Next/openEuler-24.03-LTS-SP1/openEuler-24.03-LTS-SP2/openEuler-24.03-LTS-SP3. openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. High cpp-httplib https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1554 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-28434 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-28435 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-29076 https://nvd.nist.gov/vuln/detail/CVE-2026-28434 https://nvd.nist.gov/vuln/detail/CVE-2026-28435 https://nvd.nist.gov/vuln/detail/CVE-2026-29076 openEuler-24.03-LTS-SP3 cpp-httplib-0.37.0-1.oe2403sp3.aarch64.rpm cpp-httplib-debuginfo-0.37.0-1.oe2403sp3.aarch64.rpm cpp-httplib-debugsource-0.37.0-1.oe2403sp3.aarch64.rpm cpp-httplib-devel-0.37.0-1.oe2403sp3.aarch64.rpm cpp-httplib-0.37.0-1.oe2403sp3.src.rpm cpp-httplib-0.37.0-1.oe2403sp3.x86_64.rpm cpp-httplib-debuginfo-0.37.0-1.oe2403sp3.x86_64.rpm cpp-httplib-debugsource-0.37.0-1.oe2403sp3.x86_64.rpm cpp-httplib-devel-0.37.0-1.oe2403sp3.x86_64.rpm cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.35.0, when a request handler throws a C++ exception and the application has not registered a custom exception handler via set_exception_handler(), the library catches the exception and writes its message directly into the HTTP response as a header named EXCEPTION_WHAT. This header is sent to whoever made the request, with no authentication check and no special configuration required to trigger it. The behavior is on by default. A developer who does not know to opt in to set_exception_handler() will ship a server that leaks internal exception messages to any client. This vulnerability is fixed in 0.35.0. 2026-03-15 CVE-2026-28434 openEuler-24.03-LTS-SP3 Medium 5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N cpp-httplib security update 2026-03-15 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1554 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. 2026-03-15 CVE-2026-28435 openEuler-24.03-LTS-SP3 High 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H cpp-httplib security update 2026-03-15 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1554 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. 2026-03-15 CVE-2026-29076 openEuler-24.03-LTS-SP3 Medium 5.9 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H cpp-httplib security update 2026-03-15 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-1554