CVSS 3.1
5.9 mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:NCVE-2026-69206
Medium (5.9). EPSS 0.4% chance of exploitation in the next 30 days. Fixed in org.http4s:http4s-ember-core_2.12 0.23.35.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 33% of CVEs (scores of 2026-10-31)
- CWE
- CWE-294
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-9xww-74xv-gjfp | Maven | org.http4s:http4s-ember-core_2.12 | <0.23.35 | 0.23.35 |
| GHSA-9xww-74xv-gjfp | Maven | org.http4s:http4s-ember-core_2.13 | <0.23.35 | 0.23.35 |
| GHSA-9xww-74xv-gjfp | Maven | org.http4s:http4s-ember-core_3 | <0.23.35 | 0.23.35 |
| GHSA-9xww-74xv-gjfp | Maven | org.http4s:http4s-ember-core_2.13 | >=1.0.0-M1 <1.0.0-M47 | 1.0.0-M47 |
| GHSA-9xww-74xv-gjfp | Maven | org.http4s:http4s-ember-core_3 | >=1.0.0-M1 <1.0.0-M47 | 1.0.0-M47 |