CVE-2026-69208GHSA-FM4G-76C9-7W69
Http4s: DigestAuth nonce map grows unbounded
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 0.23.35, 1.0.0-M47
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- http4s http4s
fixed in 0.23.35; From 1.0.0-M1 · fixed in 1.0.0-M47
- org.http4s:http4s-ember-server_2.12Maven
fixed in 0.23.35
- org.http4s:http4s-ember-server_2.13Maven
fixed in 0.23.35
- org.http4s:http4s-ember-server_3Maven
fixed in 0.23.35
- org.http4s:http4s-ember-server_2.13Maven
From 1.0.0-M1 · fixed in 1.0.0-M47
- org.http4s:http4s-ember-server_3Maven
From 1.0.0-M1 · fixed in 1.0.0-M47