High severity7.5NVD Advisory· Published Sep 15, 2026
CVE-2026-69203
CVE-2026-69203
Description
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
org.http4s:http4s-ember-core_2.12Maven | < 0.23.35 | 0.23.35 |
org.http4s:http4s-ember-core_2.13Maven | < 0.23.35 | 0.23.35 |
org.http4s:http4s-ember-core_3Maven | < 0.23.35 | 0.23.35 |
org.http4s:http4s-ember-core_2.13Maven | >= 1.0.0-M1, < 1.0.0-M47 | 1.0.0-M47 |
org.http4s:http4s-ember-core_3Maven | >= 1.0.0-M1, < 1.0.0-M47 | 1.0.0-M47 |
Affected products
1Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-9vwc-pc8p-253qghsaADVISORY
- github.com/http4s/http4s/commit/4983de1f93f2caaa3b9de310cf6a9db32c50d66envdWEB
- github.com/http4s/http4s/releases/tag/v0.23.35nvdWEB
- github.com/http4s/http4s/releases/tag/v1.0.0-M47nvdWEB
- github.com/http4s/http4s/security/advisories/GHSA-9vwc-pc8p-253qnvdWEB
News mentions
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