HTTP Request Smuggling Affecting yhirose/cpp-httplib package, versions [,0.23.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-YHIROSECPPHTTPLIB-10734889
- published14 Jul 2025
- disclosed10 Jul 2025
- creditsebastianosrt
Introduced: 10 Jul 2025
NewCVE-2025-53628 (opens in a new tab)How to fix?
Upgrade yhirose/cpp-httplib to version 0.23.0 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling through the processing of chunked encoded requests in parse_header function. An attacker can manipulate request boundaries by injecting conflicting Content-Length or Transfer-Encoding headers via trailers which can lead to desynchronised request processing, smuggling malicious headers through trailers or bypassing IP-based access controls, authentication mechanisms, and rate limiting.