Cpp Httplib CVE-2026-29076
MEDIUMCVSS VectorNVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
4DescriptionNVD
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.
AnalysisAI
Remote denial of service in cpp-httplib prior to version 0.37.0 allows unauthenticated attackers to crash server processes by submitting HTTP POST requests with maliciously crafted RFC 5987 filename* parameters that trigger catastrophic backtracking in the regex parser. The vulnerability exploits the recursive stack-based implementation of libstdc++'s regex engine, causing uncontrolled stack growth and stack overflow. …
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RemediationAI
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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