High 7.5Published Feb 26, 2026

CVE-2026-27633TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32.

Updated under an hour ago (2026-10-19 09:40 UTC)

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It affects ritlabs tinyweb. Add what you run to find out whether that includes you.

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Every CVE for ritlabs tinyweb

Exploited in the last 30 days

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).

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400, CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ritlabs tinyweb ritlabs:tinyweb	before 2.02	NVD

References

https://github.com/maximmasiutin/TinyWeb/commit/1cb5a1dpatch
https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-992w-gmcm-fmgrvendor-advisory
https://www.masiutin.net/tinyweb-cve-2026-27633.htmlthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.