exploit-intel.com Critical CRLF Injection Vulnerability in cpp-httplib (CVE-2026-45372)
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- •CVE-2026-45372 is a critical CRLF injection vulnerability in cpp-httplib.
- •The flaw affects all versions prior to 0.44.0 and has a CVSS score of 9.9.
- •Users are urged to upgrade to cpp-httplib version 0.44.0 or later to mitigate risks.
A critical vulnerability, CVE-2026-45372, has been identified in cpp-httplib, a C++11 HTTP/HTTPS library. The flaw allows attackers to inject carriage return and newline byte pairs into HTTP header values due to improper percent-decoding handling. This issue affects all versions prior to 0.44.0 and has a CVSS score of 9.9, indicating high severity. Exploitation requires network access to a vulnerable server, potentially leading to serious attacks such as response splitting and request smuggling. No public proof-of-concept exploits are available yet, but users are strongly advised to upgrade to version 0.44.0 or newer to mitigate the risk. The vulnerability was first reported on May 29, 2026.
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