{"id":"CVE-2026-73564","revision":"930c85c9e56242a495d3eda838d1f3ea","records":[{"revision":"930c85c9e56242a495d3eda838d1f3ea","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-73564","aliases":[],"title":"frp: Unauthenticated Remote Denial of Service in the frp SSH Tunnel Gateway via Integer Overflow","description":"frp is a fast reverse proxy. From 0.53.0 until 0.70.1, frp's optional SSH Tunnel Gateway in pkg/ssh/server.go parses an SSH exec channel request by adding 4 to an attacker-controlled four-byte big-endian length. A length of 0xFFFFFFFF makes the uint32 addition wrap to 3, defeats the payload bounds check, and causes payload[4:3] to panic in TunnelServer.handleNewChannel. When no authorized-keys file is configured, sshConfig.NoClientAuth permits an unauthenticated peer to reach this channel phase before the frp token is checked, so a single five-byte request terminates the frps process and drops every active tunnel. This issue is fixed in version 0.70.1.","state":0,"publishedAt":"2026-08-13T17:35:46.762+00:00","modifiedAt":"2026-08-13T17:53:06.534+00:00","affected":[{"ecosystem":"Vendor product","name":"frp","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"fatedier\",\n                    \"product\": \"frp\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 0.53.0, < 0.70.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.7,"severity":"HIGH"}],"references":["https://github.com/fatedier/frp/security/advisories/GHSA-26gq-p25f-99cp","https://github.com/fatedier/frp/pull/5428","https://github.com/fatedier/frp/commit/7dc7be930e2452ae93fd32f2a77f8c6fcd0b652b","https://github.com/fatedier/frp/releases/tag/v0.70.1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-73564","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-73564","identifiers":["CVE-2026-73564"]},"retained":false,"historicalAffected":[]}],"coverage":[]}