Medium · CVSS 6.3CVE-2026-110314

WebSocket frames keep reaching the WebSock after a server-initiated close in BanditCVE-2026-110314

Answer in brief

CVE-2026-110314 records a Medium severity (CVSS 6.3) vulnerability in WebSocket frames keep reaching the WebSock after a server-initiated close in Bandit. The current sources do not mark it as known exploited. The current feed maps mtrudel/bandit (generic), mtrudel/mtrudel/bandit (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 26, 2026Updated Oct 26, 2026Source checked Oct 26, 2026First seen by HOL Oct 26, 2026Material review Oct 26, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.3
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 6.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps mtrudel/bandit (generic), mtrudel/mtrudel/bandit (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
mtrudel/banditgeneric	>=0.5.1 <1.14.0	1.14.0
mtrudel/mtrudel/banditgeneric	>=bb407f2277dcb65a58dd8cc07913a0b58a80e266 <220b9dfd27f9a21305be2afc75cbe585ddc24e7a	220b9dfd27f9a21305be2afc75cbe585ddc24e7a

Recommended response

Check inventory. Check lockfiles and deployed manifests for mtrudel/bandit, mtrudel/mtrudel/bandit.
Review the reported fix. Source-reported workaround: Mark the WebSock state as stopped whenever a callback returns {:stop, ...}, and have handle_in/2 and handle_info/2 return {:ok, state} without acting while that mark is set.

Evidence timeline and material changes

Published upstream
Oct 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 26, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.