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ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrus…

Low CVSS 3.6
CVECVE-2025-61984
First seen2026-07-14 20:30 UTC
Disclosed2025-10-06 19:15 UTC
Last updated2026-07-14 20:30 UTC
Channel statusauto

Summary

ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code execution when a ProxyCommand is used. The untrusted sources are the command line and %-sequence expansion of a configuration file. (A configuration file that provides a complete literal username is not categorized as an untrusted source.)

In-depth triage · Auto channel

No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).

Lint boundary warnings (5)

The following non-blocking warnings were raised during the lint phase of this triage (e.g. reference URLs not yet on the allowlist). They do not affect entry usability and are disclosed for transparency (see DR-002).

  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://marc.info/?l=openssh-unix-dev&m=175974522032149&w=2
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://www.openssh.com/releasenotes.html#10.1p1
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://www.vicarius.io/vsociety/posts/cve-2025-61984-detection-script-remote-code-execution-vulnerability-affecting-openssh
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://www.vicarius.io/vsociety/posts/cve-2025-61984-mitigation-script-remote-code-execution-vulnerability-affecting-openssh
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://dgl.cx/2025/10/bash-a-newline-ssh-proxycommand-cve-2025-61984

Sources

  • NVD DATABASE

Original Links

Timeline

  1. nvd_ingest NVD