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CVE-2026-54590VulnerabilityPublished

Python asyncssh: AsyncSSH is a Python package which provides an asynchronous client and server implementation of the

Affects python-asyncsshSource GCVE Database

0
Authoritative record:CVE-2026-54590· Medium 5.9

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

CVSS 3.1 base score
5.9Medium
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Ubuntu:16.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=xenialOther threatsAffected
  • =1.2.0-1
  • =1.2.1-1
  • =1.3.0-1
Fixed in–
Ubuntu:Pro:18.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=esm-apps/bionicOther threatsAffected
  • =1.8.1-2
  • =1.11.0-2
  • =1.11.1-1
  • =1.11.1-1ubuntu0.1~esm1
  • =1.11.1-1ubuntu0.1~esm2
Fixed in–
Ubuntu:20.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=focalOther threatsAffected
  • =1.12.2-1
  • =1.12.2-1ubuntu0.1
  • =1.12.2-1ubuntu0.2
Fixed in–
Ubuntu:Pro:22.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=esm-apps/jammyOther threatsAffected
  • =2.5.0-1
  • =2.5.0-1ubuntu0.1~esm1
  • =2.5.0-1ubuntu0.1
  • =2.5.0-1ubuntu0.1+esm1
Fixed in–
Ubuntu:Pro:24.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=esm-apps/nobleOther threatsAffected
  • =2.10.1-2
  • =2.10.1-2ubuntu0.1
  • =2.10.1-2ubuntu0.1+esm1
Fixed in–
Ubuntu:25.10python-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=questingOther threatsAffected
  • =2.20.0-1
Fixed in–
Ubuntu:26.04:LTSpython-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=resoluteOther threatsAffected
  • =2.20.0-1
  • =2.21.1-1
Fixed in–
Homebrewdvcpkg:brew/dvcOther threatsAffected
  • >=2.7.3_1 <3.67.1_7
Fixed in
  • 3.67.1_7
Ubuntu:26.10python-asyncsshpkg:deb/ubuntu/python-asyncssh?arch=source&distro=stonkingOther threatsAffected
  • =2.21.1-1
  • =2.23.0-1
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

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