# CVE-2025-36520: Null dereference in Comdb2

> A null pointer dereference in Bloomberg Comdb2 allows remote attackers to cause a denial of service via crafted network packets.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Jul 2025
- **Updated:** 3 Nov 2025
- **Also known as:** GHSA-pcp6-2jq5-m5cf

## What is CVE-2025-36520?

CVE-2025-36520 is a high-severity vulnerability in Bloomberg Comdb2, published on 22 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A null pointer dereference vulnerability exists in the net_connectmsg Protocol Buffer Message functionality of Bloomberg Comdb2 8.1. A specially crafted network packets can lead to a denial of service. An attacker can send packets to trigger this vulnerability.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2025-36520?

It affects 1 product.


Products: Bloomberg Comdb2.

## How do I fix CVE-2025-36520?

No fix has been published for CVE-2025-36520 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-36520 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-36520 exists.

## Other vulnerabilities in Bloomberg Comdb2

- [CVE-2025-35966](https://insights.sbomify.com/CVE-2025-35966/): Null dereference in Comdb2 (high 7.5)
- [CVE-2025-36512](https://insights.sbomify.com/CVE-2025-36512/): Denial of service in Comdb2 (high 7.5)
- [CVE-2025-46354](https://insights.sbomify.com/CVE-2025-46354/): Denial of service in Comdb2 (high 7.5)
- [CVE-2025-48498](https://insights.sbomify.com/CVE-2025-48498/): Null dereference in Comdb2 (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-36520 and fix it if it is affected.

What it is: CVE-2025-36520 is a high-severity vulnerability in Bloomberg Comdb2, published on 22 Jul 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-2025-36520 exists.

Affected product: Bloomberg Comdb2. 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-2025-36520/ (Markdown: https://insights.sbomify.com/CVE-2025-36520/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-36520
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-36520
- OSV: https://osv.dev/vulnerability/CVE-2025-36520

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-36520/
Summaries are generated and may contain mistakes; the official description above is the record.