{"cve":"CVE-2026-73564","nvd":{"published":"2026-08-13T18:18:18.950","modified":"2026-10-24T15:10:00.190","status":"Deferred","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.","cvss_v4":{"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},"cvss_v3":null,"cwes":["CWE-129","CWE-190"],"references":["https://github.com/fatedier/frp/commit/7dc7be930e2452ae93fd32f2a77f8c6fcd0b652b","https://github.com/fatedier/frp/pull/5428","https://github.com/fatedier/frp/releases/tag/v0.70.1","https://github.com/fatedier/frp/security/advisories/GHSA-26gq-p25f-99cp","https://github.com/fatedier/frp/security/advisories/GHSA-26gq-p25f-99cp"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-73564","score":0.00524,"percentile":0.44133,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-26gq-p25f-99cp","url":"https://osv.dev/vulnerability/GHSA-26gq-p25f-99cp","summary":"frp: Unauthenticated Remote Denial of Service in the frp SSH Tunnel Gateway via Integer Overflow","modified":"2026-08-18T15:10:56.272335772Z","packages":[{"ecosystem":"Go","name":"github.com/fatedier/frp","purl":"pkg:golang/github.com/fatedier/frp","ranges":[">=0.53.0 <0.70.1"],"fixed":["0.70.1"]}]},{"id":"GO-2026-6103","url":"https://osv.dev/vulnerability/GO-2026-6103","summary":"frp: Unauthenticated Remote Denial of Service in the frp SSH Tunnel Gateway via Integer Overflow in github.com/fatedier/frp","modified":"2026-08-18T15:00:19.906003392Z","packages":[{"ecosystem":"Go","name":"github.com/fatedier/frp","purl":"pkg:golang/github.com/fatedier/frp","ranges":[">=0.53.0 <0.70.1"],"fixed":["0.70.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}