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    CVE-2026-45372

    cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's server parses an incoming request, it applies percent-decoding to every header value except Location and Referer. The validity check (is_field_value) is run before decoding, so encoded %0D%0A passes the check and is then expanded to a literal \r\n byte pair inside the stored header value. This vulnerability is fixed in 0.44.0.

    Published:May 29, 2026
    Last Modified:Jun 1, 2026
    EPS:May 29, 2026
    EPSS Score:0.00041
    CVSS Score:9.9

    Affected Products

    Vendor
    Yhirose
    Product
    Cpp-httplib

    Exploits

    https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xjxg-64p4-vj4mhttps://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xjxg-64p4-vj4m

    Related CVEs

    CVE-2026-77358 (CVSS 8.2) — cpp-httplib is a C++ header-only HTTP/HTTPS library. In versions 0.33.0 through 0.50.0, the TLS-enabled WebSoc…
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    CVE-2026-54919 (CVSS 7.4) — cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. In affected Mbed TLS backend…
    CVE-2026-46527 (CVSS 8.7) — cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, When the se…
    CVE-2026-45352 (CVSS 5.3) — cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.43.4, negative ch…
    CVE-2026-34441 (CVSS 4.8) — cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.40.0, cpp…
    CVE-2026-33745 (CVSS 7.4) — cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.39.0, the cpp-htt…
    CVE-2026-32627 (CVSS 8.7) — cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.37.2, when a cpp-…
    CVE-2026-31870 (CVSS 7.5) — cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.37.1, when a cpp-…
    CVE-2026-29076 (CVSS 5.9) — cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.37.0, cpp…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High