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NVD Vulnerability Details :
CVE-2026-27630
Analyzed
More InfoOfficial Page
Source-security-advisories@github.com
View Known Exploited Vulnerability (KEV) details
Published At-26 Feb, 2026 | 00:16
Updated At-28 Feb, 2026 | 01:01

TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Versions prior to version 2.02 are vulnerable to a Denial of Service (DoS) attack known as Slowloris. The server spawns a new OS thread for every incoming connection without enforcing a maximum concurrency limit or an appropriate request timeout. An unauthenticated remote attacker can exhaust server concurrency limits and memory by opening numerous connections and sending data exceptionally slowly (e.g. 1 byte every few minutes). Anyone hosting services using TinyWeb is impacted. Version 2.02 fixes the issue. The patch introduces a `CMaxConnections` limit (set to 512) and a `CConnectionTimeoutSecs` idle timeout (set to 30 seconds). As a temporary workaround if upgrading is not immediately possible, consider placing the server behind a robust reverse proxy or Web Application Firewall (WAF) such as nginx, HAProxy, or Cloudflare, configured to buffer incomplete requests and aggressively enforce connection limits and timeouts.

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
Secondary4.08.7HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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:N/A:H
Type: Secondary
Version: 4.0
Base score: 8.7
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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:N/A:H
CPE Matches

ritlabs
ritlabs
>>tinyweb>>Versions before 2.02(exclusive)
cpe:2.3:a:ritlabs:tinyweb:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-400Primarysecurity-advisories@github.com
CWE-770Primarynvd@nist.gov
CWE ID: CWE-400
Type: Primary
Source: security-advisories@github.com
CWE ID: CWE-770
Type: Primary
Source: nvd@nist.gov
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/maximmasiutin/TinyWeb/commit/23268c8security-advisories@github.com
Patch
https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-ccv5-8948-c99csecurity-advisories@github.com
Vendor Advisory
https://www.masiutin.net/tinyweb-cve-2026-27630.htmlsecurity-advisories@github.com
Third Party Advisory
Hyperlink: https://github.com/maximmasiutin/TinyWeb/commit/23268c8
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-ccv5-8948-c99c
Source: security-advisories@github.com
Resource:
Vendor Advisory
Hyperlink: https://www.masiutin.net/tinyweb-cve-2026-27630.html
Source: security-advisories@github.com
Resource:
Third Party Advisory
Change History
0Changes found

Details not found