Python asyncssh: AsyncSSH is a Python package which provides an asynchronous client and server implementation of the
Affects python-asyncsshSource GCVE Database
Not known to be exploited · CVSS 5.9 Medium : upgrade to 3.67.1_7 when convenient.
Data as of 26 Oct 2026, 09:16 UTC
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 33% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 3.67.1_7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 8 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 2026.
What to do
Upgrade dvc to 3.67.1_7.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu:16.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=xenialOther threats | Affected
| Fixed in– |
Ubuntu:Pro:18.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=esm-apps/bionicOther threats | Affected
| Fixed in– |
Ubuntu:20.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=focalOther threats | Affected
| Fixed in– |
Ubuntu:Pro:22.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=esm-apps/jammyOther threats | Affected
| Fixed in– |
Ubuntu:Pro:24.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=esm-apps/nobleOther threats | Affected
| Fixed in– |
Ubuntu:25.10python-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu:26.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Homebrewdvcpkg:brew/dvcOther threats | Affected
| Fixed in
|
Ubuntu:26.10python-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade AsyncSSH to version 3.67.1_7 or later, where this vulnerability is fixed. No other mitigations are indicated.
Description
AsyncSSH versions prior to 3.67.1_7 contain a vulnerability where a peer-supplied send_pktsize value of zero causes a synchronous loop to become permanently true without awaiting, freezing the connection. This denial of service can be triggered by a malicious SSH server or an authenticated client, affecting current and future connections. The issue is fixed in version 3.67.1_7.
References
- ubuntu.com/security/CVE-2026-54590 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-54590 (opens in a new tab)
- github.com/ronf/asyncssh/commit/3d515ba9ba0cd9990d248bdf62bcf05d51261a88 (opens in a new tab)
- github.com/ronf/asyncssh/releases/tag/v2.23.1 (opens in a new tab)
- github.com/ronf/asyncssh/security/advisories/GHSA-qr67-gv47-xwwh (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-54590 (opens in a new tab)
- github.com/ronf/asyncssh (opens in a new tab)