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.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-3b0e5b457d advisory.

    # Update to 0.30.1

    - [Denial of service (DOS) using zip bomb (CVE-2026-22776)](https://github.com/yhirose/cpp-     httplib/security/advisories/GHSA-h934-98h4-j43q)
    - [CRLF injection in http headers (CVE-2026-21428)](https://github.com/yhirose/cpp-     httplib/security/advisories/GHSA-wpc6-j37r-jcx7)
    - [Untrusted HTTP Header Handling: X-Forwarded-For/X-Real-IP Trust     (CVE-2025-66577)](https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-gfpf-r66f-5mh2)

    https://github.com/yhirose/cpp-httplib/releases/tag/v0.30.1

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-e50e41fcea advisory.

    # Update to 0.30.1

    - [Denial of service (DOS) using zip bomb (CVE-2026-22776)](https://github.com/yhirose/cpp-     httplib/security/advisories/GHSA-h934-98h4-j43q)
    - [CRLF injection in http headers (CVE-2026-21428)](https://github.com/yhirose/cpp-     httplib/security/advisories/GHSA-wpc6-j37r-jcx7)
    - [Untrusted HTTP Header Handling: X-Forwarded-For/X-Real-IP Trust     (CVE-2025-66577)](https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-gfpf-r66f-5mh2)

    https://github.com/yhirose/cpp-httplib/releases/tag/v0.30.1


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-22776)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
294951	Fedora 42 : cpp-httplib (2026-3b0e5b457d)	Nessus	Fedora Local Security Checks	high
294942	Fedora 43 : cpp-httplib (2026-e50e41fcea)	Nessus	Fedora Local Security Checks	high
282619	Linux Distros Unpatched Vulnerability : CVE-2026-22776	Nessus	Misc.	high

Detections

Analytics

CVE-2026-22776

high

Tenable Plugins

high

high

high