High · CVSS 8.7CVE-2026-115269

HTTP/2 WINDOW_UPDATE and SETTINGS frames reset the request body read timeout in BanditCVE-2026-115269

Answer in brief

CVE-2026-115269 records a High severity (CVSS 8.7) vulnerability in HTTP/2 WINDOW_UPDATE and SETTINGS frames reset the request body read timeout 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: High · CVSS 8.7
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.7. 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	>=1.4.0 <1.14.0	1.14.0
mtrudel/mtrudel/banditgeneric	>=fff06efe3be962b484bd4d3eb339372fda5a231f <220b9dfd27f9a21305be2afc75cbe585ddc24e7a	220b9dfd27f9a21305be2afc75cbe585ddc24e7a

Recommended response

Check inventory. Check lockfiles and deployed manifests for mtrudel/bandit, mtrudel/mtrudel/bandit.
Review the reported fix. Source-reported workaround: Disable HTTP/2 with http_2_options: [enabled: false], so that the vulnerable read path never runs.

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

Allocation of Resources Without Limits or Throttling vulnerability in the HTTP/2 request body reader of mtrudel bandit allows an unauthenticated remote attacker to hold stream processes open indefinitely via WINDOW_UPDATE or empty SETTINGS frames sent while a Plug reads the request body. Bandit.HTTP2.Stream.do_read_data/4 in lib/bandit/http2/stream.ex waits for each frame with a fresh read_timeout. A stream WINDOW_UPDATE, or the zero-delta window update that every empty SETTINGS frame delivers to all streams, ends the wait without delivering any body data, and the loop starts a new full countdown. A client that sends one of these 9-byte frames before each countdown expires keeps read_body blocked, together with the stream process and whatever the application holds while reading, for as long as it likes. This issue affects bandit: from 1.4.0 before 1.14.0.

Quoted source text, attributed separately from HOL analysis.

Apache Vysper: Unbounded allocationAlso CWE-770