CVE-2026-73564

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Source
https://cve.org/CVERecord?id=CVE-2026-73564
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73564.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-73564
Aliases
Downstream
Related
Published
2026-08-13T17:35:46Z
Modified
2026-09-09T18:26:44Z
Severity
  • 8.7 (High) CVSS_V4 - 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 CVSS Calculator
Summary
frp: Unauthenticated Remote Denial of Service in the frp SSH Tunnel Gateway via Integer Overflow
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-129",
        "CWE-190"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73564.json"
}
References

Affected packages

Git / github.com/fatedier/frp

Affected ranges

Type
GIT
Repo
https://github.com/fatedier/frp
Events
Introduced
051299ec25638895e36779c305abf554671b4f68
Fixed
7dc7be930e2452ae93fd32f2a77f8c6fcd0b652b
Fixed
fa3bcca2b0c4753cd4f0e2ab189dd6a5a6a15708
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0.53.0"
        },
        {
            "fixed": "0.70.1"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.53.0
v0.53.1
v0.53.2
v0.54.0
v0.55.0
v0.55.1
v0.56.0
v0.57.0
v0.58.0
v0.58.1
v0.59.0
v0.60.0
v0.61.0
v0.61.1
v0.61.2
v0.62.0
v0.62.1
v0.63.0
v0.64.0
v0.65.0
v0.66.0
v0.67.0
v0.68.0
v0.68.1
v0.69.0
v0.69.1
v0.70.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73564.json"