CVE-2026-69208High· 7.5▾ TwilightHttp4s 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 applic…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 17.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.4%
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
org.http4s:http4s-ember-server_2.12 <= 0.23.34org.http4s:http4s-ember-server_2.13 <= 0.23.34org.http4s:http4s-ember-server_3 <= 0.23.34org.http4s:http4s-ember-server_2.13 >= 1.0.0-M1, <= 1.0.0-M46org.http4s:http4s-ember-server_3 >= 1.0.0-M1, <= 1.0.0-M46Patched in:
org.http4s:http4s-ember-server_2.12 0.23.35org.http4s:http4s-ember-server_2.13 0.23.35org.http4s:http4s-ember-server_3 0.23.35org.http4s:http4s-ember-server_2.13 1.0.0-M47org.http4s:http4s-ember-server_3 1.0.0-M47Connected by shared product, vendor, weakness, or advisory.
CVE-2026-69213High· 7.5Http4s is a Scala interface for HTTP services
CVE-2026-69209High· 7.5Http4s is a Scala interface for HTTP services
CVE-2026-69218High· 7.5Http4s is a Scala interface for HTTP services
CVE-2026-69206Medium· 5.9Http4s is a Scala interface for HTTP services
CVE-2026-69203High· 7.5Http4s is a Scala interface for HTTP services
CVE-2026-69202High· 7.5Http4s is a Scala interface for HTTP services