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    CVE-2026-22776

    cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.1, a Denial of Service (DoS) vulnerability exists in cpp-httplib due to the unsafe handling of compressed HTTP request bodies (Content-Encoding: gzip, br, etc.). The library validates the payload_max_length against the compressed data size received from the network, but does not limit the size of the decompressed data stored in memory.

    Published:Jan 12, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 12, 2026
    EPSS Score:0.00081
    CVSS Score:7.5

    Affected Products

    Vendor
    Yhirose
    Product
    Cpp-httplib

    Exploits

    https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-h934-98h4-j43q

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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…
    CVE-2026-77341 (CVSS 5.3) — cpp-httplib is a C++ header-only HTTP/HTTPS library. In version 0.49.0, the chunked-response trailer output pa…
    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-2026-45372 (CVSS 9.9) — cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-ht…
    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-…

    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