CVE-2026-69216 json
Http4s: Ember chunk parser lenience (TE.TE request smuggling)
published 2026-09-15 54 d ago modified 2026-09-16 53 d ago also GHSA-jrpm-956j-96jg , EUVD-2026-79176
- cvss
- 5.4
- 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 30%
- public exploits
- 0
- none known
Summary
Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s chunk decoder trims the chunk-size token and accepts leading plus or minus signs instead of requiring one or more hexadecimal digits followed by the required CRLF. When an intermediary forwards chunked data without re-encoding and interprets malformed chunk boundaries differently, an unauthenticated attacker can create TE.TE request smuggling that bypasses intermediary controls, poisons caches, or hijacks the request queue. The same response-path leniency can enable response smuggling against an ember-client used as a gateway when the upstream is malicious or compromised. 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
0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/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-444 Inconsistent Interpretation of HTTP Requests
References
Sources
- CVE List CVE-2026-69216
- GitHub Advisory GHSA-jrpm-956j-96jg
- NVD CVE-2026-69216
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