# CVE-2025-35434: CISA Thorium does not validate TLS connections to Elasticsearch

> An attacker can impersonate the Elasticsearch service by bypassing TLS validation, potentially intercepting or modifying data.

- **Severity:** Low 2.3 (`CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Sep 2025
- **Updated:** 30 Sep 2025
- **Also known as:** GHSA-r8gr-36v8-m732

## What is CVE-2025-35434?

CVE-2025-35434 is a low-severity vulnerability in CISA Thorium, published on 17 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

CISA Thorium does not validate TLS certificates when connecting to Elasticsearch. An unauthenticated attacker with access to a Thorium cluster could impersonate the Elasticsearch service. Fixed in 1.1.2.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2025-35434?

It affects 1 product.


Products: Cisa Thorium.

## How do I fix CVE-2025-35434?

No fix has been published for CVE-2025-35434 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-35434 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-35434 exists.

## Other vulnerabilities in CISA Thorium

- [CVE-2025-35432](https://insights.sbomify.com/CVE-2025-35432/): CISA Thorium does not rate limit account verification email messages (medium 6.9)
- [CVE-2025-35436](https://insights.sbomify.com/CVE-2025-35436/): CISA Thorium account verification email error handling (medium 6.9)
- [CVE-2025-35430](https://insights.sbomify.com/CVE-2025-35430/): CISA Thorium insecure downloaded file path validation (medium 5.3)
- [CVE-2025-35431](https://insights.sbomify.com/CVE-2025-35431/): CISA Thorium LDAP injection (medium 5.3)
- [CVE-2025-35435](https://insights.sbomify.com/CVE-2025-35435/): CISA Thorium download stream divide by zero (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-35434 and fix it if it is affected.

What it is: CVE-2025-35434 is a low-severity vulnerability in CISA Thorium, published on 17 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-35434 exists.

Affected product: CISA Thorium. 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-2025-35434/ (Markdown: https://insights.sbomify.com/CVE-2025-35434/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-35434
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-35434
- OSV: https://osv.dev/vulnerability/CVE-2025-35434

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-35434/
Summaries are generated and may contain mistakes; the official description above is the record.