CVE-2026-21428

HIGH
2026-01-01 [email protected]
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Jan 06, 2026 - 18:20 vuln.today
Public exploit code
Patch Released
Jan 06, 2026 - 18:20 nvd
Patch available
CVE Published
Jan 01, 2026 - 18:15 nvd
HIGH 7.5

Tags

Python SSRF Cpp Httplib Redhat Suse

Description

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.

Analysis

Cpp-Httplib versions up to 0.30.0 contains a vulnerability that allows attackers to add extra headers, modify request body unexpectedly & trigger an SSRF attack (CVSS 7.5).

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Vendor patch is available.

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Priority Score

58
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +38
POC: +20

Vendor Status

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CVE-2026-21428 vulnerability details – vuln.today
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