CVE-2026-73564

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-119299 gopacket provides packet processing capabilities for Go. CWE-129
• CVE-2026-119278 MariaDB Connector/J is used to connect applications developed in Java to MariaDB and… CWE-129
• CVE-2026-119143 Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a denial of service… CWE-129
• CVE-2026-93862 An out-of-bounds read vulnerability in the FireCluster Sync processing allows an attacker… CWE-129
• CVE-2026-113881 A stack-based buffer overflow vulnerability in Fireware OS's VPN Network Access… CWE-129
• CVE-2026-116816 llama.cpp b5899 before b10261 contains a heap out-of-bounds write vulnerability in… CWE-129
• CVE-2024-58400 llama.cpp before b3701 contains an out-of-bounds read vulnerability in… CWE-129
• CVE-2026-116731 Furnace through 0.6.8.3 contains an out-of-bounds write vulnerability in… CWE-129