{"apiVersion":"1.0","identifier":"CVE-2026-73564","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.","publishedAt":"2026-08-13T18:18:18","lastModifiedAt":"2026-08-13T18:18:18","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73564","cvssScore":8.7,"cvssVector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","epssProbability":0.00384,"riskScore":0.9,"affectedProduct":"frp","affectedVersions":">=0.53.0, <=0.70.1","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-73564","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-73564","en":"https://www.redsauce.net/en/cves/CVE-2026-73564","fr":"https://www.redsauce.net/fr/cves/CVE-2026-73564","pt":"https://www.redsauce.net/pt/cves/CVE-2026-73564","de":"https://www.redsauce.net/de/cves/CVE-2026-73564","sk":"https://www.redsauce.net/sk/cves/CVE-2026-73564","el":"https://www.redsauce.net/el/cves/CVE-2026-73564"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-73564"}}