CVE-2026-52814 Gogs: Unauthenticated Asymmetric Denial of Service (DoS) via SSH Handshake Stall (File Descriptor Exhaustion)

What is CVE-2026-52814?

CVE-2026-52814 is a medium-severity denial of service vulnerability in gogs, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Gogs is an open source self-hosted Git service. Prior to 0.14.3, the Gogs built-in Go SSH server is vulnerable to an unauthenticated, asymmetric Denial of Service (DoS) attack. The application accepts inbound TCP connections and passes them to golang.org/x/crypto/ssh.NewServerConn inside a new goroutine without enforcing any read/write deadlines on the underlying net.Conn. An unauthenticated attacker can open multiple TCP connections to the SSH port and simply withhold the SSH protocol banner. This forces the server to spawn an unbounded number of goroutines that block indefinitely waiting for socket I/O. This leads to complete File Descriptor (FD) exhaustion, preventing legitimate users from accessing the Git SSH service, and ultimately destabilizing the entire Gogs process (e.g., causing internal log rotation failures). This vulnerability is fixed in 0.14.3.

Weakness: CWE-400

Which versions are affected by CVE-2026-52814?

3 open source packages ship an affected version, including gogs.io/gogs.

How do I fix CVE-2026-52814?

Upgrade gogs.io/gogs to 0.14.3 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-52814 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52814 exists.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-xp79-5mx3-jx52, GO-2026-5765.