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NVD Vulnerability Details :
CVE-2026-21428
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-01 Jan, 2026 | 18:15
Updated At-06 Jan, 2026 | 18:20

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.07.7HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Type: Secondary
Version: 4.0
Base score: 7.7
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 7.5
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CPE Matches
yhirose
yhirose
>>cpp-httplib>>Versions before 0.30.0(exclusive)
cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-93Primarysecurity-advisories@github.com
CWE ID: CWE-93
Type: Primary
Source: security-advisories@github.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/yhirose/cpp-httplib/commit/98048a033a532ff22320ce1d11789f8d5710dfcdsecurity-advisories@github.com
Patch
https://github.com/yhirose/cpp-httplib/releases/tag/v0.30.0security-advisories@github.com
Product
Release Notes
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-wpc6-j37r-jcx7security-advisories@github.com
Exploit
Third Party Advisory
Hyperlink: https://github.com/yhirose/cpp-httplib/commit/98048a033a532ff22320ce1d11789f8d5710dfcd
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/yhirose/cpp-httplib/releases/tag/v0.30.0
Source: security-advisories@github.com
Resource:
Product
Release Notes
Hyperlink: https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-wpc6-j37r-jcx7
Source: security-advisories@github.com
Resource:
Exploit
Third Party Advisory
Change History
0Changes found
Details not found