# CVE-2023-41834: Apache Flink Stateful Functions allowed HTTP header injection due to Improper Neutralization of CRLF Sequences

> Remote attackers can inject arbitrary HTTP headers and conduct response splitting attacks via crafted requests in Apache Flink Stateful Functions.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 19 Sep 2023
- **Updated:** 13 Feb 2025
- **Also known as:** GHSA-v965-25gx-6h45

## What is CVE-2023-41834?

CVE-2023-41834 is a medium-severity vulnerability in Apache Flink Stateful Functions, published on 19 Sep 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Improper Neutralization of CRLF Sequences in HTTP Headers in Apache Flink Stateful Functions 3.1.0, 3.1.1 and 3.2.0 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via crafted HTTP requests. Attackers could potentially inject malicious content into the HTTP response that is sent to the user's browser. 

Users should upgrade to Apache Flink Stateful Functions version 3.3.0.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), CWE-113 (Improper Neutralization of CRLF Sequences in HTTP Headers)

## Which versions are affected by CVE-2023-41834?

It affects 1 product.


Products: Apache Flink Stateful Functions.

## How do I fix CVE-2023-41834?

No fix has been published for CVE-2023-41834 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-41834 being exploited?

There is no known exploitation of CVE-2023-41834 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-41834 and fix it if it is affected.

What it is: CVE-2023-41834 is a medium-severity vulnerability in Apache Flink Stateful Functions, published on 19 Sep 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-41834 in the wild and no public exploit code.

Affected product: Apache Flink Stateful Functions. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-41834/ (Markdown: https://insights.sbomify.com/CVE-2023-41834/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-41834
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-41834
- OSV: https://osv.dev/vulnerability/CVE-2023-41834

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From sbomify Insights: https://insights.sbomify.com/CVE-2023-41834/
Summaries are generated and may contain mistakes; the official description above is the record.