Cpp Httplib
CVE-2026-28434
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V14 - Data Protection Data exposure prevention
MITRE ATT&CK
2 techniques across 2 tactics: Collection, Discovery The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 5.3 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitation no authentication required. Public exploit/POC available. |
| Exploit ScenarioDerived | An attacker without authentication could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. [CVSS 5.3 MEDIUM]
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 0.35.0.. Restrict network access to the affected service where possible.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-200 (Information Exposure). Affects Cpp-Httplib. cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.35.0, when a request handler throws a C++ exception and the application has not registered a custom exception handler via set_exception_handler(), the library catches the exception and writes its message directly into the HTTP response as a header named EXCEPTION_WHAT. This header is sent to whoever made the request, with no authentication check and no special configuration required to trigger it. The be
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.35.0, when a request handler throws a C++ exception and the application has not registered a custom exception handler via set_exception_handler(), the library catches the exception and writes its message directly into the HTTP response as a header named EXCEPTION_WHAT. This header is sent to whoever made the request, with no authentication check and no special configuration required to trigger it. The behavior is on by default. A developer who does not know to opt in to set_exception_handler() will ship a server that leaks internal exception messages to any client. This vulnerability is fixed in 0.35.0.
Executive ViewAI
Organizations using cpp-httplib should be aware of moderate risk from CVE-2026-28434, a information exposure vulnerability rated CVSS 5.3. Sensitive information could be exposed to unauthorized parties. Proof-of-concept code is publicly available. A patch is available and should be applied during regular vulnerability management.
Apply vendor patch. If patching is delayed: restrict endpoint access, redact sensitive data in logs.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
Affected Products (CPE)GitHub Advisory
Related Vulnerabilities in cpp-httplib Request Handling Vulnerabilities
View all 2More in Cpp Httplib
View allcpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.27.0, a vulnerability allow
CVE-2025-53628 is a memory exhaustion vulnerability in cpp-httplib versions prior to 0.20.1 that allows unauthenticated
cpp-httplib is a C++ header-only HTTP/HTTPS server and client library. Rated high severity (CVSS 7.5), this vulnerabilit
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. In version 0.21.0, when many http head
CVE-2025-53629 is a Denial of Service vulnerability in cpp-httplib versions prior to 0.23.0 that allows unauthenticated
cpp-httplib versions prior to 0.30.1 are vulnerable to denial of service attacks due to insufficient validation of decom
Cpp-Httplib versions up to 0.30.0 contains a vulnerability that allows attackers to add extra headers, modify request bo
cpp-httplib through 0.5.8 does not filter \r\n in parameters passed into the set_redirect and set_header functions, whic
HTTP response/header injection in cpp-httplib server versions prior to 0.44.0 allows remote unauthenticated attackers to
Remote denial of service in cpp-httplib prior to version 0.37.0 allows unauthenticated attackers to crash server process
A security vulnerability in cpp-httplib (CVSS 5.3) that allows attacker-controlled http headers. Risk factors: public Po
Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
View allVendor StatusVendor
SUSE
Severity: Medium| Product | Status |
|---|---|
| openSUSE Tumbleweed | Fixed |
| SUSE Linux Enterprise Server 16.0 | Fixed |
| SUSE Linux Enterprise Server 16.1 | Fixed |
| SUSE Linux Enterprise Server for SAP applications 16.0 | Fixed |
| SUSE Linux Enterprise Server for SAP applications 16.1 | Fixed |
Exploit-DB