Bug 2453582 (CVE-2026-34441)

Summary: CVE-2026-34441 cpp-httplib: cpp-httplib: HTTP Request Smuggling via unconsumed GET request body
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in cpp-httplib, a C++11 HTTP/HTTPS library. This vulnerability, known as HTTP Request Smuggling, allows a remote attacker to embed an arbitrary HTTP request within the body of a GET request. The server's static file handler fails to consume the entire request body, leaving unread bytes on the TCP stream. These remaining bytes are then interpreted as a new, separate HTTP request, enabling the attacker to bypass security controls or access unauthorized resources.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2453747, 2453748, 2453749    
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Description OSIDB Bzimport 2026-03-31 22:02:28 UTC 
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.40.0, cpp-httplib is vulnerable to HTTP Request Smuggling. The server's static file handler serves GET responses without consuming the request body. On HTTP/1.1 keep-alive connections, the unread body bytes remain on the TCP stream and are interpreted as the start of a new HTTP request. An attacker can embed an arbitrary HTTP request inside the body of a GET request, which the server processes as a separate request. This issue has been patched in version 0.40.0.