EUVD-2026-79194
GHSA-9vwc-pc8p-253q
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (GitHub_M) · only source for this CVE.
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
5Blast Radius
ecosystem impact- 3 maven packages depend on org.http4s:http4s-ember-core_2.12 (2 direct, 1 indirect)
Ecosystem-wide dependent count for version 0.23.35.
DescriptionCVE.org
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, An Ember server with HTTP/2 enabled through withHttp2 does not enforce SETTINGS_MAX_CONCURRENT_STREAMS for peer-created streams. One unauthenticated connection can open an unbounded number of streams, each retaining per-stream state until heap exhaustion. The same unchecked allocation is reachable in an ember-client through server-initiated PUSH_PROMISE frames because enablePush is not enforced. This issue is fixed in versions 0.23.35 and 1.0.0-M47.
AnalysisAI
Heap exhaustion in the http4s Ember backend (0.23.x before 0.23.35 and 1.0.0 milestones before 1.0.0-M47) allows a single unauthenticated HTTP/2 connection to open an unbounded number of peer-created streams because SETTINGS_MAX_CONCURRENT_STREAMS is never enforced, and each stream retains per-stream state until the JVM heap is exhausted. The same unchecked allocation is reachable on the client side through server-initiated PUSH_PROMISE frames, since enablePush is likewise not honored. …
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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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