# CVE-2025-13434: jameschz Hush Framework HTTP Host Header Util.php http headers for scripting syntax

> Remote attackers can inject malicious scripts via the HTTP Host header in Hush Framework, potentially leading to code execution or security bypass.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Nov 2025
- **Updated:** 20 Nov 2025
- **Also known as:** GHSA-xfj2-w4fv-cg6j

## What is CVE-2025-13434?

CVE-2025-13434 is a medium-severity cross-site scripting vulnerability in jameschz Hush Framework, published on 20 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A weakness has been identified in jameschz Hush Framework 2.0. The impacted element is an unknown function of the file Hush\hush-lib\hush\Util.php of the component HTTP Host Header Handler. This manipulation of the argument $_SERVER['HOST'] causes improper neutralization of http headers for scripting syntax. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be exploited. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-644 (Improper Neutralization of HTTP Headers for Scripting Syntax)

## Which versions are affected by CVE-2025-13434?

It affects 1 product.


Products: Jameschz Hush.

## How do I fix CVE-2025-13434?

No fix has been published for CVE-2025-13434 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-13434 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-13434 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-13434 and fix it if it is affected.

What it is: CVE-2025-13434 is a medium-severity cross-site scripting vulnerability in jameschz Hush Framework, published on 20 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-13434 exists.

Affected product: jameschz Hush Framework. 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-2025-13434/ (Markdown: https://insights.sbomify.com/CVE-2025-13434/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-13434
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-13434
- OSV: https://osv.dev/vulnerability/CVE-2025-13434

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-13434/
Summaries are generated and may contain mistakes; the official description above is the record.