CVE-2026-27630

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Source

https://cve.org/CVERecord?id=CVE-2026-27630

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27630.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-27630

Aliases

GHSA-ccv5-8948-c99c

Published

2026-02-25T23:05:16.563Z

Modified

2026-03-02T08:04:44.606665Z

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 vulnerable to Remote Denial of Service via Thread/Connection Exhaustion (Slowloris)

Details

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.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27630.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-2026-27630.json"