SB2026042434 - Input validation error in Cpp-httplib

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Main Vulnerability Database SB2026042434

SB2026042434 - Input validation error in Cpp-httplib

Published: April 24, 2026

Security Bulletin ID SB2026042434
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Input validation error (CVE-ID: CVE-2026-31870)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in ClientImpl::open_stream() when parsing the Content-Length response header in the streaming API. A remote attacker can send a specially crafted HTTP response with a malformed Content-Length header to cause a denial of service.

Only the streaming API paths that call open_stream() are affected; the regular non-streaming request path is not affected.


Remediation

Install update from vendor's website.

References