# CVE-2025-35436: CISA Thorium account verification email error handling

> An unauthenticated attacker can crash the CISA Thorium application by sending a specially crafted email address during account verification.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Sep 2025
- **Updated:** 30 Sep 2025
- **Also known as:** GHSA-rjv5-cqp8-h968

## What is CVE-2025-35436?

CVE-2025-35436 is a medium-severity denial of service vulnerability in CISA Thorium, published on 17 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

CISA Thorium uses '.unwrap()' to handle errors related to account verification email messages. An unauthenticated remote attacker could cause a crash by providing a specially crafted email address or response. Fixed in commit 6a65a27.

Weakness: CWE-248 (Uncaught Exception)

## Which versions are affected by CVE-2025-35436?

It affects 1 product.


Products: Cisa Thorium.

## How do I fix CVE-2025-35436?

No fix has been published for CVE-2025-35436 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-35436 being exploited?

There is no known exploitation of CVE-2025-35436 in the wild and no public exploit code.

## 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-2025-35430](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)
- [CVE-2025-35433](https://insights.sbomify.com/CVE-2025-35433/): CISA Thorium does not properly invalidate previously used tokens (low 2.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-35436 and fix it if it is affected.

What it is: CVE-2025-35436 is a medium-severity denial of service vulnerability in CISA Thorium, published on 17 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-35436 in the wild and no public exploit code.

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-2025-35436/ (Markdown: https://insights.sbomify.com/CVE-2025-35436/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-35436
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-35436
- OSV: https://osv.dev/vulnerability/CVE-2025-35436

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-35436/
Summaries are generated and may contain mistakes; the official description above is the record.