CVE-2026-69208
Published:September 15, 2026
Updated:September 22, 2026
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
https://github.com/http4s/http4s.git (GITHUB):
Affected version(s) >=v0.22.0-M8 <v0.23.35Fix Suggestion:
Update to version v0.23.35https://github.com/http4s/http4s.git (GITHUB):
Affected version(s) >=v1.0.0-M1 <v1.0.0-M47Fix Suggestion:
Update to version v1.0.0-M47org.http4s:http4s-ember-server_2.13 (JAVA):
Affected version(s) >=0.10.0-M10 <0.23.35Fix Suggestion:
Update to version 0.23.35org.http4s:http4s-ember-server_2.13 (JAVA):
Affected version(s) >=1.0.0-M2 <1.0.0-M47Fix Suggestion:
Update to version 1.0.0-M47org.http4s:http4s-ember-server_2.12 (JAVA):
Affected version(s) >=0.10.0-M10 <0.23.35Fix Suggestion:
Update to version 0.23.35org.http4s:http4s-ember-server_3 (JAVA):
Affected version(s) >=0.22.0-M8 <0.23.35Fix Suggestion:
Update to version 0.23.35org.http4s:http4s-ember-server_3 (JAVA):
Affected version(s) >=1.0.0-M22 <1.0.0-M47Fix Suggestion:
Update to version 1.0.0-M47Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.41