Answer in brief
CVE-2026-73564 records a High severity 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.
Answer in brief
CVE-2026-73564 records a High severity 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.
A CVSS score is not reported in the current record. 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 | Not reported |
| 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
Aug 13, 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.
A CVSS score is not reported in the current record. 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 | Not reported |
| 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
Aug 13, 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.