CVE-2026-69206 json
Http4s: DigestAuth allows replay of captured requests
published 2026-09-15 54 d ago modified 2026-09-16 53 d ago also GHSA-9xww-74xv-gjfp , EUVD-2026-79236
- cvss
- 5.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 33%
- public exploits
- 0
- none known
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.
Patch / fix
- maven org.http4s:http4s-ember-core_2.12 0.23.35
- maven org.http4s:http4s-ember-core_2.13 0.23.35, 1.0.0-M47
- maven org.http4s:http4s-ember-core_3 0.23.35, 1.0.0-M47
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 53 d ago
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
| GitHub | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.http4s:http4s-ember-core_2.12 | <0.23.35 |
0.23.35 |
| maven | org.http4s:http4s-ember-core_2.13 | <0.23.35 >=1.0.0-M1, <1.0.0-M47 |
0.23.35 1.0.0-M47 |
| maven | org.http4s:http4s-ember-core_3 | <0.23.35 >=1.0.0-M1, <1.0.0-M47 |
0.23.35 1.0.0-M47 |
Affected products
- http4s http4s
Classification
- Weakness
-
- CWE-294 Authentication Bypass by Capture-replay
References
Sources
- CVE List CVE-2026-69206
- GitHub Advisory GHSA-9xww-74xv-gjfp
- NVD CVE-2026-69206
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