EUVD-2026-79234
GHSA-6m4x-pp6q-5jmm
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (github) · only source for this CVE.
CVSS VectorVendor: github
Lifecycle Timeline
5DescriptionCVE.org
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s HTTP/2 flow-control window is replenished according to bytes received from the network rather than bytes consumed by the application, while each stream stores DATA in an unbounded channel. A hostile peer can therefore send a body faster than a slow or non-draining application consumes it, retaining payloads in heap on an ember-server or ember-client configured with withHttp2. The patch bounds the per-stream H2Connection body channel so application consumption applies backpressure. This issue is fixed in versions 0.23.35 and 1.0.0-M47.
AnalysisAI
Unbounded heap growth in http4s Ember's HTTP/2 read path allows a hostile peer to exhaust server or client memory and crash the JVM with an OutOfMemoryError. Any Ember server built with withHttp2 that exposes a slow-draining or non-draining route is affected, as is any Ember client consuming a response body from an untrusted server; versions before 0.23.35 and before 1.0.0-M47 are vulnerable. …
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
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