CVE-2026-27633

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Source

https://cve.org/CVERecord?id=CVE-2026-27633

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27633.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-27633

Aliases

GHSA-992w-gmcm-fmgr

Published

2026-02-25T23:07:35.787Z

Modified

2026-03-02T08:04:44.595422Z

Severity

8.7 (High) CVSS_V4 - 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 CVSS Calculator

Summary

TinyWeb has Unbounded Content-Length Memory Exhaustion (DoS)

Details

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).

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27633.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-400"
    ]
}

References

Affected packages

Git / github.com/maximmasiutin/tinyweb

Affected ranges

Type: GIT
Repo: https://github.com/maximmasiutin/tinyweb
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

e09ebba3444d3aa5a081f49db51849deec2cd64e

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27633.json"