CVE-2026-22776

HIGH

cpp-httplib < 0.30.1 - Denial of Service via Unbounded Decompression of HTTP Request Bodies

Title source: llm
STIX 2.1

Description

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.

References (2)

Core 2

Scores

CVSS v3 7.5
EPSS 0.0035
EPSS Percentile 27.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-409
Status published
Products (1)
yhirose/cpp-httplib < 0.30.1
Published Jan 12, 2026
Tracked Since Feb 18, 2026