{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-27630","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-02-20T22:02:30.028Z","datePublished":"2026-02-25T23:05:16.563Z","dateUpdated":"2026-02-26T16:50:51.538Z"},"containers":{"cna":{"title":"TinyWeb vulnerable to Remote Denial of Service via Thread/Connection Exhaustion (Slowloris)","problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"references":[{"name":"https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-ccv5-8948-c99c","tags":["x_refsource_CONFIRM"],"url":"https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-ccv5-8948-c99c"},{"name":"https://github.com/maximmasiutin/TinyWeb/commit/23268c8","tags":["x_refsource_MISC"],"url":"https://github.com/maximmasiutin/TinyWeb/commit/23268c8"},{"name":"https://www.masiutin.net/tinyweb-cve-2026-27630.html","tags":["x_refsource_MISC"],"url":"https://www.masiutin.net/tinyweb-cve-2026-27630.html"}],"affected":[{"vendor":"maximmasiutin","product":"TinyWeb","versions":[{"version":"< 2.02","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-02-25T23:07:56.613Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-ccv5-8948-c99c","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-26T16:47:44.721473Z","id":"CVE-2026-27630","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-02-26T16:50:51.538Z"}}]}}