CVE-2026-69206
Description
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, DigestAuth replay protection records lastNc plus one instead of the highest nonce-count value it has accepted. When a legitimate client sends noncontiguous nc values because of parallel or retried requests, the stored counter remains below the accepted maximum, allowing a passive observer to replay a captured Authorization header multiple times. Successful replays execute authenticated requests, including state-changing operations, as the captured user. This issue is fixed in versions 0.23.35 and 1.0.0-M47.
How to fix
- org.http4s:http4s-ember-core_2.120.23.35 or later
- org.http4s:http4s-ember-core_2.130.23.35, 1.0.0-M47 or later
- org.http4s:http4s-ember-core_30.23.35, 1.0.0-M47 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.http4s:http4s-ember-core_2.12Maven | v < 0.23.35 | 0.23.35 |
| org.http4s:http4s-ember-core_2.13Maven | v < 0.23.35, 1.0.0-M1 ≤ v < 1.0.0-M47 | 0.23.35, 1.0.0-M47 |
| org.http4s:http4s-ember-core_3Maven | v < 0.23.35, 1.0.0-M1 ≤ v < 1.0.0-M47 | 0.23.35, 1.0.0-M47 |
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Attack Surface Management
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