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CVE-2026-110314VulnerabilityPublished Updated

bandit · Client-Side Enforcement of Server-Side Security Vulnerability

Affects banditSource GCVE Database

0
Authoritative record:CVE-2026-110314· Medium 6.3

Not known to be exploited · CVSS 6.3 Medium.

Data as of 28 Oct 2026, 22:31 UTC

CVSS 4.0 base score
6.3Medium
How severe the flaw is on the 0–10 CVSS scale.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Oct 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

Affected software

ProductAffectedFixed in
Ubuntu 26.10banditpkg:deb/ubuntu/bandit?arch=source&distro=stonkingOther threatsAffected
  • =1.7.10-3
  • =1.9.4-1
Fixed in–
Ubuntu 26.04 LTSbanditpkg:deb/ubuntu/bandit?arch=source&distro=resoluteOther threatsAffected
  • =1.7.10-2
  • =1.7.10-3
Fixed in–
Ubuntu 24.04 LTSbanditpkg:deb/ubuntu/bandit?arch=source&distro=nobleOther threatsAffected
  • =1.6.2-3
Fixed in–
Ubuntu 22.04 LTSbanditpkg:deb/ubuntu/bandit?arch=source&distro=jammyOther threatsAffected
  • =1.6.2-1
Fixed in–
Ubuntu 20.04 LTSbanditpkg:deb/ubuntu/bandit?arch=source&distro=focalOther threatsAffected
  • =1.5.1-3
  • =1.6.2-1
Fixed in–
Ubuntu 18.04 LTSbanditpkg:deb/ubuntu/bandit?arch=source&distro=bionicOther threatsAffected
  • =1.4.0-0ubuntu2
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

Client-Side Enforcement of Server-Side Security vulnerability in the WebSocket connection handling of mtrudel bandit allows a remote client to keep running WebSock handler code after the server has stopped its connection, via data frames sent after ignoring the server's Close frame. When a WebSock callback returns {:stop, ...}, Bandit.WebSocket.Connection calls terminate/2, sends Close and shuts down the write side, but keeps the connection process running in a :closing state. handle_frame/3 and handle_info/3 never check that state, so later frames still reach handle_in/2 and later messages reach handle_info/2, with the state from the stop tuple, until the client sends Close, TCP drops or the idle timeout fires. A client refused in init/1 after a failed token check could still run an admin-only action. This issue affects bandit: from 0.5.1 before 1.14.0.

References

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