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Vulnerabilities

Vulnerability · CVE-2025-46728

cpp-httplib is a C++ header-only HTTP/HTTPS server and client library.

Published May 6, 2025 · catalog updated May 6, 2025 · cpp-httplib is a C++

Check if you run it

No confirmed exploitation is on record for CVE-2025-46728. EPSS is 0.66%. Act only if a listed version of cpp-httplib is a C++ is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (cpp-httplib is a C++).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.66%
Remediation
Version ranges on file
Affected products
vendor yhirose cpp-httplib < 0.20.1

cpp-httplib is a C++ header-only HTTP/HTTPS server and client library. Prior to version 0.20.1, the library fails to enforce configured size limits on incoming request bodies when is used or when no header is provided. A remote attacker can send a chunked request without the terminating zero-length chunk, causing uncontrolled memory allocation on the server. This leads to potential exhaustion of system memory and results in a server crash or unresponsiveness. Version 0.20.1 fixes the issue by enforcing limits during parsing. If the limit is exceeded at any point during reading, the connection

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor yhirose cpp-httplib < 0.20.1< 0.20.1

How to fix CVE-2025-46728

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-46728. EPSS is 0.66%. Act only if a listed version of cpp-httplib is a C++ is installed.

Which versions are affected?

Compare what you have installed with yhirose cpp-httplib < 0.20.1 < 0.20.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.66%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 6, 2025 · EUVD

    Detected

    cpp-httplib is a C++ header-only HTTP/HTTPS server and client library. Prior to version 0.20.1, the library fails to enforce configured size limits on incoming request bodies when is used or when no header is provided. A remote attacker can send a chunked request without the terminating zero-length chunk, causing uncontrolled memory allocation on the server. This leads to potential exhaustion of s

  2. May 6, 2025 · EUVD

    Updated

    cpp-httplib is a C++ header-only HTTP/HTTPS server and client library. Prior to version 0.20.1, the library fails to enforce configured size limits on incoming request bodies when is used or when no header is provided. A remote attacker can send a chunked request without the terminating zero-length chunk, causing uncontrolled memory allocation on the server. This leads to potential exhaustion of s

Sources

  • CVE.orgVulnerability recordCVE-2025-46728

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-46728

    30-day exploitation probability 0.7%

    first.org
  • EUVDVulnerability recordEUVD-2025-13496

    cpp-httplib is a C++ header-only HTTP/HTTPS server and client library. Prior to version 0.20.1, the library fails to enforce configured size limits on incoming request bodies when is used or when no header is provided. A remote attacker can send a chunked request without the term

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

CVE-2025-46728: cpp-httplib is a C++ header-only HTTP/HTTPS server… · ZeroDay Findings