HTTP Request Smuggling in akka-http-core
A vulnerable Akka HTTP server will accept a malformed message and hand it over to the user. If the user application proxies this message to another server unchanged and that server also accepts that message but interprets it as two HTTP messages, the second message has reached the second server without having been inspected by the proxy.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | com.typesafe.akka:akka-http-core | >= 10.2.0, < 10.2.4, < 10.1.14 | 10.2.4, 10.1.14 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-23339
- https://github.com/akka/akka-http/pull/3754%23issuecomment-779265201
- https://github.com/akka/akka-http/commit/e3a4935151c91cee28e65e6b894dd50839ef9d34
- https://doc.akka.io/docs/akka-http/10.1/security/2021-02-24-incorrect-handling-of-Transfer-Encoding-header.html
- https://snyk.io/vuln/SNYK-JAVA-COMTYPESAFEAKKA-1075043
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-444- Platform
- Java / Kotlin (Maven)
- Package
com.typesafe.akka:akka-http-core- Disclosed
- 10.05.2021
- Updated
- 11.10.2026 12:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-2w7w-2j92-44hx - CC BY 4.0
Vulnerability history: com.typesafe.akka:akka-http-core
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 05.2021 10.2023
- Without a fix
- 0
- Exploited in attacks
- 1
Severity breakdown
- Medium 2
Disclosures per year
- 2021: 1
- 2022: 0
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 0
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