Tinyweb
CVE-2026-27633
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessSend HTTP POST request
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ExploitSpecify massive Content-Length header
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ExecutionServer allocates unbounded memory
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ImpactMemory exhaustion triggers crash
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource consumption limits
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | No special conditions — remote unauthenticated exploitation against TinyWeb versions prior to 2.02 with default configurations accepting HTTP POST requests. |
| Impact | CVSS 7.5 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitation no authentication required. Exploitable via remote/network. |
| Exploit ScenarioDerived | A remote attacker without authentication could exploit this flaw, all available memory being consumed and causing the server t. |
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Alert meAnalysisAIv1 – Mar 12, 2026
TinyWeb versions prior to 2.02 are vulnerable to denial of service through memory exhaustion when unauthenticated attackers send HTTP POST requests with extremely large Content-Length headers, causing the server to allocate unbounded memory and crash. The vulnerability affects all organizations running vulnerable TinyWeb instances, and patch version 2.02 addresses it by implementing a 10MB maximum entity body size limit.
Earlier versions of this analysis (1)
TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Versions prior to version 2.02 have a Denial of Service (DoS) vulnerability via memory exhaustion. [CVSS 7.5 HIGH]
RemediationAI
A vendor patch is available — apply it immediately. 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-400 (Uncontrolled Resource Consumption). Affects Tinyweb. TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Versions prior to version 2.02 have a Denial of Service (DoS) vulnerability via memory exhaustion. Unauthenticated remote attackers can send an HTTP POST request to the server with an exceptionally large Content-Length header (e.g., 2147483647). The server continuously allocates memory for the request body (EntityBody) while streaming the payload without enforcing any maximum limit, leading to all available memory being con
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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:N/I:N/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
2DescriptionGitHub Advisory
TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Versions prior to version 2.02 have a Denial of Service (DoS) vulnerability via memory exhaustion. Unauthenticated remote attackers can send an HTTP POST request to the server with an exceptionally large Content-Length header (e.g., 2147483647). The server continuously allocates memory for the request body (EntityBody) while streaming the payload without enforcing any maximum limit, leading to all available memory being consumed and causing the server to crash. Anyone hosting services using TinyWeb is impacted. Version 2.02 fixes the issue. The patch introduces a CMaxEntityBodySize limit (set to 10MB) for the maximum size of accepted payloads. As a temporary workaround if upgrading is not immediately possible, consider placing the server behind a Web Application Firewall (WAF) or reverse proxy (like nginx or Cloudflare) configured to explicitly limit the maximum allowed HTTP request body size (e.g., client_max_body_size in nginx).
Executive ViewAI
TinyWeb servers running versions prior to 2.02 are vulnerable to denial of service attacks through memory exhaustion, potentially rendering web services unavailable. Organizations using TinyWeb in production environments face service disruption risks that could impact business continuity and customer access.
Apply vendor patch. If immediate patching is not feasible: implement rate limiting and connection limits at network perimeter; deploy DDoS mitigation services; segment TinyWeb servers behind a reverse proxy with request filtering; monitor memory utilization and implement alerting for anomalous consumption patterns.
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
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)GitHub Advisory
Path traversal in TinyWeb through 0.0.8 allows unauthenticated remote attackers to read arbitrary files from the server'
Null pointer dereference in TinyWeb 0.0.8 and earlier allows unauthenticated remote attackers to crash worker processes
Memory exhaustion vulnerability in TinyWeb HTTP server (through 0.0.8) enables unauthenticated remote attackers to cause
TinyWeb 1.94 and below allows unauthenticated remote attackers to cause a denial of service (Buffer Overflow) when sendi
TinyWeb HTTP Server before 1.98 has OS command injection via CGI ISINDEX query parameters. The query string is passed as
Unauthenticated command injection in TinyWeb HTTP/HTTPS server for Win32 before 2.01 allows remote attackers to execute
A security vulnerability has been detected in Ritlabs TinyWeb Server 1.94. Rated medium severity (CVSS 5.5), this vulner
Integer overflow in TinyWeb before 2.03.
TinyWeb versions prior to 2.04 fail to properly sanitize control characters and encoded sequences (CR, LF, NUL) in HTTP
TinyWeb versions prior to 2.02 lack connection limits and request timeouts, enabling unauthenticated remote attackers to
Exploit-DB