CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-69203
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, 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.
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-9vwc-pc8p-253q | Maven | org.http4s:http4s-ember-core_2.12 | <0.23.35 | 0.23.35 |
| GHSA-9vwc-pc8p-253q | Maven | org.http4s:http4s-ember-core_2.13 | <0.23.35 | 0.23.35 |
| GHSA-9vwc-pc8p-253q | Maven | org.http4s:http4s-ember-core_3 | <0.23.35 | 0.23.35 |
| GHSA-9vwc-pc8p-253q | Maven | org.http4s:http4s-ember-core_2.13 | >=1.0.0-M1 <1.0.0-M47 | 1.0.0-M47 |
| GHSA-9vwc-pc8p-253q | Maven | org.http4s:http4s-ember-core_3 | >=1.0.0-M1 <1.0.0-M47 | 1.0.0-M47 |