CVE-2026-22776— cpp-httplib vulnerable to a denial of service (DOS) using a zip bomb
Quick assessment
Affected
yhirose cpp-httplib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
cpp-httplib是yhirose个人开发者的一款使用C++语言编写的HTTP/HTTPS服务器和客户端库。 cpp-httplib 0.30.1之前版本存在安全漏洞，该漏洞源于对压缩HTTP请求体的不安全处理，可能导致拒绝服务攻击。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-22776
Vulnerability Information
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Vulnerability Title
cpp-httplib vulnerable to a denial of service (DOS) using a zip bomb
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
cpp-httplib 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cpp-httplib是yhirose个人开发者的一款使用C++语言编写的HTTP/HTTPS服务器和客户端库。 cpp-httplib 0.30.1之前版本存在安全漏洞，该漏洞源于对压缩HTTP请求体的不安全处理，可能导致拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| yhirose | cpp-httplib | < 0.30.1 | - |
|
II. Public POCs for CVE-2026-22776
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: cpp-httplib
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CVE-2026-54919
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CVE-2026-34441
cpp-httplib: HTTP Request Smuggling via Unconsumed GET Reque
Same vendor: yhirose
-
CVE-2026-54919
cpp-httplib: TLS certificate chain verification bypassed for -
CVE-2026-45372
cpp-httplib: HTTP header value percent-decoding in server-si -
CVE-2026-46527
cpp-httplib: Malicious `X-Forwarded-For` Under Trusted-Proxy -
CVE-2026-45352
cpp-httplib DoS: Negative chunk-size in chunked Transfer-Enc -
CVE-2026-34441
cpp-httplib: HTTP Request Smuggling via Unconsumed GET Reque
Same weakness: CWE-409
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V. Comments for CVE-2026-22776
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