CVE-2026-52814: Gogs Denial of Service via SSH handshake stall in built-in SSH server

CVE-2026-52814 · Severity: medium · CVSS 4 · Published 2026-06-24

Gogs is an open-source self-hosted Git service used by teams to manage source code. A vulnerability in its built-in SSH server allows an unauthenticated attacker to crash the service or make it unavailable by opening many connections and refusing to send data. This can lead to a total service outage, preventing developers from accessing their code and disrupting automated development workflows.

Technologies: gogs.io/gogs (Go), Gogs. Vendors: Go, Gogs.

Quick answers

Is CVE-2026-52814 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-52814 being exploited in the wild.
How severe is CVE-2026-52814?
Medium severity, with a CVSS score of 4, published 24 June 2026.
Which products and versions are affected?
gogs.io/gogs (Go) < 0.14.3, SEMVER:introduced=0, SEMVER:introduced=0,fixed=0.14.3; Gogs < 0.14.3.
Is there a fix for CVE-2026-52814?
Yes. gogs.io/gogs (Go): upgrade to 0.14.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-52814 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-52814?
Check whether you run gogs.io/gogs (Go) or Gogs at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • gogs.io/gogs (Go): upgrade to 0.14.3 or later
    go get gogs.io/gogs@v0.14.3

Technical details

The Gogs built-in SSH server fails to enforce read/write deadlines on underlying TCP connections before passing them to the Go SSH handshake handler. An unauthenticated attacker can initiate numerous TCP connections and withhold the SSH protocol banner, causing the server to spawn an unbounded number of goroutines that block indefinitely. This results in File Descriptor (FD) exhaustion and memory pressure, eventually preventing legitimate SSH access and causing secondary failures like log rotation errors. The vulnerability is rooted in the 'listen' function within 'internal/ssh/ssh.go'. It has been patched in version 0.14.3 by implementing a 15-second handshake timeout.

Affected products

  • Gogs Gogs < 0.14.3

Identifiers

  • CVE-2026-52814
  • GHSA-xp79-5mx3-jx52
  • GO-2026-5765

Timeline

  • 2026-06-07: patched: Fix merged into main branch and version 0.14.3 released.
  • 2026-06-19: advisory: GitHub Security Advisory GHSA-xp79-5mx3-jx52 published.
  • 2026-06-24: disclosed: CVE-2026-52814 published to NVD.

References

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