# CVE-2019-25101: OnShift TurboGears HTTP Header controllers.py response splitting

> Remote attackers can perform HTTP response splitting in TurboGears, potentially poisoning caches or redirecting users.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 4 Feb 2023
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-8q38-w56m-qq2c, PYSEC-2026-556

## What is CVE-2019-25101?

CVE-2019-25101 is a medium-severity vulnerability in OnShift TurboGears, published on 4 Feb 2023. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability classified as critical has been found in OnShift TurboGears 1.0.11.10. This affects an unknown part of the file turbogears/controllers.py of the component HTTP Header Handler. The manipulation leads to http response splitting. It is possible to initiate the attack remotely. Upgrading to version 1.0.11.11 is able to address this issue. The patch is named f68bbaba47f4474e1da553aa51564a73e1d92a84. It is recommended to upgrade the affected component. The associated identifier of this vulnerability is VDB-220059.

Weakness: CWE-436 (Interpretation Conflict), CWE-113 (Improper Neutralization of CRLF Sequences in HTTP Headers)

## Which versions are affected by CVE-2019-25101?

3 open source packages ship an affected version, including turbogears and TurboGears. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `turbogears` | PyPI | All versions | 1.0.11.11 |
| `turbogears` | PyPI | All versions | 1.0.11.11 |
| `TurboGears` | PyPI | All versions | 1.0.11.11 |

Products: Turbogears Project Turbogears.

## How do I fix CVE-2019-25101?

Upgrade turbogears to 1.0.11.11 or later.

## Is CVE-2019-25101 being exploited?

There is no known exploitation of CVE-2019-25101 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-25101 and fix it if it is affected.

What it is: CVE-2019-25101 is a medium-severity vulnerability in OnShift TurboGears, published on 4 Feb 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2019-25101 in the wild and no public exploit code.

Affected packages and fixed versions:
- turbogears (PyPI): affected all versions; fixed in 1.0.11.11
- turbogears (PyPI): affected all versions; fixed in 1.0.11.11
- TurboGears (PyPI): affected all versions; fixed in 1.0.11.11

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-2019-25101/ (Markdown: https://insights.sbomify.com/CVE-2019-25101/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-25101
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-25101
- OSV: https://osv.dev/vulnerability/CVE-2019-25101

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-25101/
Summaries are generated and may contain mistakes; the official description above is the record.