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Vulnerabilities ›

CVE-2026-21428

High ⚡ Exploit Available

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.0, the ``write_headers`` function does not check for CR & LF characters in user supplied headers

CWE-93 — Weakness Type

                    Published: Jan 1, 2026                      ·  Modified: Feb 28, 2026                      ·  Source: NVD                

CVSS v3

7.5

🔗 NVD Official

📄 Description (English)

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.0, the ``write_headers`` function does not check for CR & LF characters in user supplied headers, allowing untrusted header value to escape header lines.
This vulnerability allows attackers to add extra headers, modify request body unexpectedly & trigger an SSRF attack. When combined with a server that supports http1.1 pipelining (springboot, python twisted etc), this can be used for server side request forgery (SSRF). Version 0.30.0 fixes this issue.

🤖

Queued for AI Analysis

This CVE will be auto-analyzed on the next cron run.

🔗 References & Sources 3

https://github.com/yhirose/cpp-httplib/commit/98048a033a532ff22320ce1d11789f8d5710dfcd

security-advisories@github.com

https://github.com/yhirose/cpp-httplib/releases/tag/v0.30.0

security-advisories@github.com

Product Release Notes

https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-wpc6-j37r-jcx7

security-advisories@github.com

Exploit Third Party Advisory

📦 Affected Products / CPE 1 entries

yhirose:cpp-httplib

📊 CVSS Score

7.5

/ 10.0 — High

📊 CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack VectorN — None / Network

Attack ComplexityL — Low / Local

Privileges RequiredN — None / Network

User InteractionN — None / Network

ScopeU — Unchanged

ConfidentialityN — None / Network

IntegrityH — High

AvailabilityN — None / Network

📋 Quick Facts

Severity High

CVSS Score7.5

CWECWE-93

EPSS0.02%

Exploit ✓ Yes

Patch ✓ Yes

Published 2026-01-01

Source Feed nvd

Views 1

🏷️ Tags

exploit-available patch-available CWE-93

⚡ Actions

🔗 NVD Official Page ⚡ Exploit-DB Search 🐙 GitHub PoC Search 🎯 MITRE ATT&CK 📊 CVE Details

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