bandit · Client-Side Enforcement of Server-Side Security Vulnerability
Affects banditSource GCVE Database
Not known to be exploited · CVSS 6.3 Medium.
Data as of 28 Oct 2026, 22:31 UTC
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 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
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10banditpkg:deb/ubuntu/bandit?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSbanditpkg:deb/ubuntu/bandit?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSbanditpkg:deb/ubuntu/bandit?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 22.04 LTSbanditpkg:deb/ubuntu/bandit?arch=source&distro=jammyOther threats | Affected
| Fixed in– |
Ubuntu 20.04 LTSbanditpkg:deb/ubuntu/bandit?arch=source&distro=focalOther threats | Affected
| Fixed in– |
Ubuntu 18.04 LTSbanditpkg:deb/ubuntu/bandit?arch=source&distro=bionicOther 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
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
- ubuntu.com/security/CVE-2026-110314 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-110314 (opens in a new tab)
- cna.erlef.org/cves/cve-2026-110314.html (opens in a new tab)
- github.com/mtrudel/bandit/commit/220b9dfd27f9a21305be2afc75cbe585ddc24e7a (opens in a new tab)
- github.com/mtrudel/bandit/commit/bb407f2277dcb65a58dd8cc07913a0b58a80e266 (opens in a new tab)
- github.com/mtrudel/bandit/security/advisories/ghsa-2v5v-8f9v-xh85 (opens in a new tab)
- hex.pm/packages/bandit (opens in a new tab)
- github.com (opens in a new tab)
- github.com/mtrudel/bandit (opens in a new tab)
- repo.hex.pm (opens in a new tab)
- github.com/cveproject/cvelistv5/tree/main/cves/2026/110xxx/cve-2026-110314.json (opens in a new tab)
- nvd.nist.gov/vuln/detail/cve-2026-110314 (opens in a new tab)
- osv.dev/vulnerability/eef-cve-2026-110314 (opens in a new tab)