CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-69202
High (7.5). EPSS 0.6% chance of exploitation in the next 30 days. Fixed in org.http4s:http4s-ember-core_2.12 0.23.35.
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.
Severity
- EPSS
- 0.6% chance of exploitation in the next 30 days; higher than 50% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-400, CWE-770
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-6m4x-pp6q-5jmm | Maven | org.http4s:http4s-ember-core_2.12 | <0.23.35 | 0.23.35 |
| GHSA-6m4x-pp6q-5jmm | Maven | org.http4s:http4s-ember-core_2.13 | <0.23.35 | 0.23.35 |
| GHSA-6m4x-pp6q-5jmm | Maven | org.http4s:http4s-ember-core_3 | <0.23.35 | 0.23.35 |
| GHSA-6m4x-pp6q-5jmm | Maven | org.http4s:http4s-ember-core_2.13 | >=1.0.0-M1 <1.0.0-M47 | 1.0.0-M47 |
| GHSA-6m4x-pp6q-5jmm | Maven | org.http4s:http4s-ember-core_3 | >=1.0.0-M1 <1.0.0-M47 | 1.0.0-M47 |