High severity7.5NVD Advisory· Published Sep 15, 2026· Updated Sep 17, 2026
CVE-2026-69208
CVE-2026-69208
Description
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, the DigestAuth server middleware removes fresh nonces and stops eviction at the first stale nonce because its stale-nonce comparison is inverted. On an application that protects at least one route with DigestAuth, an unauthenticated attacker can repeatedly trigger authentication challenges, causing the persistent nonce map to grow until the JVM exhausts heap memory. 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-server_2.12Maven | < 0.23.35 | 0.23.35 |
org.http4s:http4s-ember-server_2.13Maven | < 0.23.35 | 0.23.35 |
org.http4s:http4s-ember-server_3Maven | < 0.23.35 | 0.23.35 |
org.http4s:http4s-ember-server_2.13Maven | >= 1.0.0-M1, < 1.0.0-M47 | 1.0.0-M47 |
org.http4s:http4s-ember-server_3Maven | >= 1.0.0-M1, < 1.0.0-M47 | 1.0.0-M47 |
Affected products
2Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-fm4g-76c9-7w69ghsaADVISORY
- github.com/http4s/http4s/commit/8cfeda8472954d631dfbe5dc026463a27653e482nvdWEB
- 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-fm4g-76c9-7w69nvdWEB
News mentions
1- Http4s: Batch of 18 CVEs Disclosed, Featuring Critical HTTP/1.1 and HTTP/2 FlawsVypr Intelligence · Sep 15, 2026