CVE-2026-69206
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| http4s | http4s | < 0.23.35 | affected |
| http4s | http4s | >= 1.0.0-M1, < 1.0.0-M47 | affected |
Weaknesses
- CWE-294: CWE-294: Authentication Bypass by Capture-replay
References
- https://github.com/http4s/http4s/security/advisories/GHSA-9xww-74xv-gjfp
- https://github.com/http4s/http4s/commit/7f065101c45f3d86bc105e8fc6323c2c4a11471f
- https://github.com/http4s/http4s/releases/tag/v0.23.35
- https://github.com/http4s/http4s/releases/tag/v1.0.0-M47
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