OpenSSH · Ssh
Affects opensshSource GCVE Database
Not known to be exploited · CVSS 3.6 Low · fixed in 1:8.2p1-4ubuntu0.13+esm1 : update openssh when convenient.
Data as of 29 Oct 2026, 19:04 UTC
- EPSS
- 0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 1:8.2p1-4ubuntu0.13+esm1, 1:8.2p1-4ubuntu0.fips.0.13.1, 1:8.9p1-3ubuntu0.14 +5
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 6 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Patches and advisories
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10openssh-ssh1pkg:deb/ubuntu/openssh-ssh1?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSopensshpkg:deb/ubuntu/openssh?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSopenssh-ssh1pkg:deb/ubuntu/openssh-ssh1?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 25.10opensshpkg:deb/ubuntu/openssh?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10openssh-ssh1pkg:deb/ubuntu/openssh-ssh1?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSopensshpkg:deb/ubuntu/openssh?arch=source&distro=nobleOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
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.)
References
- ubuntu.com/security/CVE-2025-61984 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-61984 (opens in a new tab)
- openwall.com/lists/oss-security/2025/10/06/1 (opens in a new tab)
- marc.info (opens in a new tab)
- openssh.com/releasenotes.html (opens in a new tab)
- ubuntu.com/security/notices/USN-8090-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8090-2 (opens in a new tab)