Answer in brief
CVE-2026-73564 records a High severity (CVSS 8.7) vulnerability in frp: Unauthenticated Remote Denial of Service in the frp SSH Tunnel Gateway via Integer Overflow. The current sources do not mark it as known exploited. The current feed maps fatedier/frp (generic), github.com/fatedier/frp (go), github.com/fatedier/frp (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps fatedier/frp (generic), github.com/fatedier/frp (go), github.com/fatedier/frp (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| fatedier/frpgeneric | >=0.53.0 <0.70.1 | 0.70.1 |
| github.com/fatedier/frpgo | >=0.53.0 <0.70.1 | 0.70.1 |
| github.com/fatedier/frpgo | >=0.53.0,<=0.70.0 | 0.70.1 |
Published upstream
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 8, 2026
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.
Quoted source text, attributed separately from HOL analysis.