What is CVE-2026-22776?

CVE-2026-22776 is a high-severity vulnerability in Yhirose Cpp-httplib, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 7.5/10. Published 2026-01-12.

How severe is CVE-2026-22776?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Yhirose Cpp-httplib

CVE-2026-22776

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-…

EPSS: 0.004 (27.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Yhirose Cpp-httplib — versions < 0.30.1

Weakness classification (CWE)

CWE-409 — Improper Handling of Highly Compressed Data (Data Amplification)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2026-22776?: CVE-2026-22776 is a high-severity vulnerability in Yhirose Cpp-httplib, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 7.5/10. Published 2026-01-12.
How severe is CVE-2026-22776?: High severity. CVSS v3 base score is 7.5 out of 10.