Answer in brief
CVE-2026-111103 records a High severity (CVSS 8.2) vulnerability in HTTP/2 StreamError recovery rolls back connection state and bypasses per-connection limits 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.
CVSS is 8.2. 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.
The current feed maps mtrudel/bandit (generic), mtrudel/mtrudel/bandit (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| mtrudel/banditgeneric | >=1.9.0 <1.14.0 | 1.14.0 |
| mtrudel/mtrudel/banditgeneric | >=3ad49c80c268891e7cc412e69649115456638e59 <220b9dfd27f9a21305be2afc75cbe585ddc24e7a | 220b9dfd27f9a21305be2afc75cbe585ddc24e7a |
Published upstream
Oct 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 26, 2026
Improper Cleanup on Thrown Exception vulnerability in the HTTP/2 handler of mtrudel bandit allows an unauthenticated remote attacker to bypass per-connection resource limits via a single TCP write that carries several frames, one of which raises a stream error. When a frame raises StreamError partway through a chunk, Bandit.HTTP2.Handler.handle_data/3 sends RST_STREAM and continues with the connection state from before the chunk, dropping the rest of it. Streams opened by earlier frames in the chunk keep running their Plug calls, but the stream counts, last_stream_id, the rapid-reset timestamps, the HPACK decoder state and the buffer roll back, so max_concurrent_streams, max_requests and the rapid-reset limiter never see those streams. A client that sends one HEADERS frame more than max_concurrent_streams in each write has the extra refused and the others forgotten: with a limit of 10, five such writes run 50 Plug calls at once. This issue affects bandit: from 1.9.0 before 1.14.0.
Quoted source text, attributed separately from HOL analysis.