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🛡️ GHSA-3m6q-h5gj-7mrw — gitea

⚪ Unknown ✅ No Known Exploit CWE-1188 OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Gitea has insecure default SSH settings

Summary

The built-in SSH server currently advertises a number of key exchange, MAC, and host key algorithms that are considered weak or broken. The defaults should be tightened so a fresh installation passes a baseline SSH security audit out of the box.

Details

Running ssh-audit against a default deployment flags the following as fail:

  • Key exchange
  • ecdh-sha2-nistp256
  • ecdh-sha2-nistp384
  • ecdh-sha2-nistp521
  • MAC
  • hmac-sha1
  • Host key
  • ssh-rsa

Reproduction

```sh

docker run -it --rm positronsecurity/ssh-audit -p 2222 gitea.local

```

Impact

Default deployments expose algorithms that are known-weak or deprecated upstream. The current workaround requires manually setting several GITEA__server__SSH_SERVER_* variables, which most users will never do.

Workaround

```ini

[server]

SSH_SERVER_KEY_EXCHANGES = curve25519-sha256, diffie-hellman-group14-sha256

SSH_SERVER_CIPHERS = chacha20-poly1305@openssh.com, aes128-ctr, aes192-ctr, aes256-ctr, aes128-gcm@openssh.com, aes256-gcm@openssh.com

SSH_SERVER_MACS = hmac-sha2-256-etm@openssh.com, hmac-sha2-256

```

There is no exposed option to restrict host key algorithms, so ssh-rsa remains advertised.

Acceptance criteria

  • [ ] Default SSH_SERVER_KEY_EXCHANGES, SSH_SERVER_CIPHERS, and SSH_SERVER_MACS updated to the secure list above.
  • [ ] New SSH_SERVER_HOST_KEY_ALGORITHMS option added, with a default that excludes ssh-rsa.
  • [ ] Documentation updated to reflect the new defaults.
  • [ ] ssh-audit against a fresh install reports no [fail] entries.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality low, integrity low, availability none.

Weakness class

GHSA-3m6q-h5gj-7mrw is classified as CWE-1188: Insecure Default Initialization of Resource. Default settings are insecure, so an installation is exposed until someone changes them.

Affected software

GHSA-3m6q-h5gj-7mrw is recorded against 1 package.

  • code.gitea.io/gitea

Timeline and source

Published on 22 April 2026 and last revised on 25 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

github.com (Web)
github.com (Package)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CWE CWE-1188
Public Exploit ✅ No
Source OSV
Published 2026-04-22
Updated 2026-08-20
Modified 2026-06-25
Fix URL N/A

Affected Packages

Software From version Fixed in
code.gitea.io/gitea — —

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