High 8.7Published Aug 13, 2026

CVE-2026-73564frp: Unauthenticated Remote Denial of Service in the frp SSH Tunnel Gateway via Integer Overflow

Updated under an hour ago (2026-10-19 06:20 UTC)

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It affects fatedier frp. Add what you run to find out whether that includes you.

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Every CVE for fatedier frp

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-129, CWE-190
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

fatedier frp fatedier:frp (from the name)	from 0.53.0, < 0.70.1	CNA record

References

https://github.com/fatedier/frp/security/advisories/GHSA-26gq-p25f-99cpx-refsource-confirm
https://github.com/fatedier/frp/pull/5428x-refsource-misc
https://github.com/fatedier/frp/commit/7dc7be930e2452ae93fd32f2a77f8c6fcd0b652bx-refsource-misc
https://github.com/fatedier/frp/releases/tag/v0.70.1x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.