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NVD Vulnerability Details :
CVE-2026-27633
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 | 01:00

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).

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/1cb5a1dsecurity-advisories@github.com
Patch
https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-992w-gmcm-fmgrsecurity-advisories@github.com
Vendor Advisory
https://www.masiutin.net/tinyweb-cve-2026-27633.htmlsecurity-advisories@github.com
Third Party Advisory
Hyperlink: https://github.com/maximmasiutin/TinyWeb/commit/1cb5a1d
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-992w-gmcm-fmgr
Source: security-advisories@github.com
Resource:
Vendor Advisory
Hyperlink: https://www.masiutin.net/tinyweb-cve-2026-27633.html
Source: security-advisories@github.com
Resource:
Third Party Advisory
Change History
0Changes found

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