cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.23.0, incoming requests using Transfer-Encoding: chunked in the header can allocate memory arbitrarily in the server, potentially leading to its exhaustion. This vulnerability is fixed in 0.23.0. NOTE: This vulnerability is related to CVE-2025-53628.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.23.0,
    incoming requests using Transfer-Encoding: chunked in the header can allocate memory arbitrarily in the
    server, potentially leading to its exhaustion. This vulnerability is fixed in 0.23.0. NOTE: This
    vulnerability is related to CVE-2025-53628. (CVE-2025-53629)

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6228 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6228-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     April 22, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : cpp-httplib     CVE ID         : CVE-2025-46728 CVE-2025-53629

    Multiple security issues were discovered in cpp-httplib, a C++ cross     platform HTTP/HTTPS library, which could result in denial of service.

    For the stable distribution (trixie), these problems have been fixed in     version 0.18.7-1+deb13u1.

    We recommend that you upgrade your cpp-httplib packages.

    For the detailed security status of cpp-httplib please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/cpp-httplib

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian 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 openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:20295-1 advisory.

    - CVE-2025-53629: header can allocate memory arbitrarily in the server, potentially leading to its     exhaustion       (bsc#1246471).
    - CVE-2025-53628: HTTP header smuggling due to insecure trailers merge (bsc#1246468).

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLES16 / SLES_SAP16 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:20600-1 advisory.

    - CVE-2025-53629: header can allocate memory arbitrarily in the server, potentially leading to its     exhaustion       (bsc#1246471).
    - CVE-2025-53628: HTTP header smuggling due to insecure trailers merge (bsc#1246468).

Tenable has extracted the preceding description block directly from the SUSE 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 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 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 0.23.0,     incoming requests using Transfer-Encoding: chunked in the header can allocate memory arbitrarily in the     server, potentially leading to its exhaustion. This vulnerability is fixed in 0.23.0. NOTE: This     vulnerability is related to CVE-2025-53628. (CVE-2025-53629)

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

ID	Name	Product	Family	Type	Severity
462919	Echo: cpp-httplib: security update to 0.18.7-1+e4	Tenable Cloud Security	Echo Local Security Checks	Local	high
462919	Echo: cpp-httplib: security update to 0.18.7-1+e4	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
309663	Debian dsa-6228 : libcpp-httplib-dev - security update	Nessus	Debian Local Security Checks	Local	high
301320	openSUSE 16 Security Update : cpp-httplib (openSUSE-SU-2026:20295-1)	Nessus	SuSE Local Security Checks	Local	medium
301281	SUSE SLES16 Security Update : cpp-httplib (SUSE-SU-2026:20600-1)	Nessus	SuSE Local Security Checks	Local	medium
294951	Fedora 42 : cpp-httplib (2026-3b0e5b457d)	Nessus	Fedora Local Security Checks	Local	high
251541	Linux Distros Unpatched Vulnerability : CVE-2025-53629	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2025-53629

high

Tenable Plugins

high

high

high

medium

medium

high

high