vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2026-27630

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

HIGH
7.5
CVSS Score
Published: February 25, 2026 at 11:05 PM UTC
Updated: June 17, 2026 at 10:27 AM UTC
2 products affected across 2 vendorsTinywebTinyWeb

Using TinyWeb by maximmasiutin?

Get instant alerts when new vulnerabilities affect TinyWeb - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH7.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tinyweb· Ritlabs
95%
v < 2.02
TinyWeb· Maximmasiutin
60%
v < 2.02
Affected range stops below 2.02, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_CONFIRMVendor Advisory
Source: cverecord
https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-ccv5-8948-c99c
x_refsource_MISCPatch
Source: cverecord
https://github.com/maximmasiutin/TinyWeb/commit/23268c8
x_refsource_MISCThird Party Advisory
Source: cverecord
https://www.masiutin.net/tinyweb-cve-2026-27630.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-400CWE-770

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card