# CVE-2026-28435

## Summary

- **CVE ID:** CVE-2026-28435
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-400, CWE-409
- **Published:** Mar 4, 2026
- **Last Modified:** Mar 12, 2026

## Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.35.0, cpp-httplib (httplib.h) does not enforce Server::set_payload_max_length() on the decompressed request body when using HandlerWithContentReader (streaming ContentReader) with Content-Encoding: gzip (or other supported encodings). A small compressed payload can expand beyond the configured payload limit and be processed by the application, enabling a payload size limit bypass and potential denial of service (CPU/memory exhaustion). This vulnerability is fixed in 0.35.0.

## Affected Products

- yhirose — cpp-httplib (< 0.35.0)

## References

- [CNA](https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xvfx-w463-6fpp)
- [CNA](https://github.com/yhirose/cpp-httplib/commit/c99d7472b5cf4869d3897b9afc9792063a3d15a8)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.42%
- **EPSS Percentile:** 35.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._