CVE-2026-22776 HIGH

CVE-2026-22776: cpp-httplib vulnerable to a denial of service (DOS) using a zip bomb

Vendor Yhirose
Product cpp-httplib
Weakness CWE-409
Published January 12, 2026
Last update January 12, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 12, 2026 CVE published
January 12, 2026 Record updated