# CVE-2026-34841: Axios npm Supply Chain Incident Impacting @usebruno/cli

> Compromised axios dependency in Bruno CLI allowed attackers to deploy a Remote Access Trojan on developer machines during a specific time window.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 6 Apr 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-658g-p7jg-wx5g

## What is CVE-2026-34841?

CVE-2026-34841 is a critical vulnerability in usebruno bruno, published on 6 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Bruno is an open source IDE for exploring and testing APIs. Prior to 3.2.1, Bruno was affected by a supply chain attack involving compromised versions of the axios npm package, which introduced a hidden dependency deploying a cross-platform Remote Access Trojan (RAT). Users of @usebruno/cli who ran npm install between 00:21 UTC and ~03:30 UTC on March 31, 2026 may have been impacted. Upgrade to 3.2.1

Weakness: CWE-506 (Embedded Malicious Code), CWE-494 (Download of Code Without Integrity Check)

## Which versions are affected by CVE-2026-34841?

2 open source packages ship an affected version, including @usebruno/cli. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@usebruno/cli` | npm | All versions | 3.2.1 |
| `@usebruno/cli` | npm | All versions | 3.2.1 |

Products: Usebruno Bruno.

## How do I fix CVE-2026-34841?

Upgrade @usebruno/cli to 3.2.1 or later.

## Is CVE-2026-34841 being exploited?

There is no known exploitation of CVE-2026-34841 in the wild and no public exploit code.

## Other vulnerabilities in usebruno bruno

- [CVE-2025-30210](https://insights.sbomify.com/CVE-2025-30210/): Bruno XSS On Environment Name (high 8.7)
- [CVE-2025-30354](https://insights.sbomify.com/CVE-2025-30354/): Bruno ignores Safe-Mode in Asserts expressions (high 8.7)
- [CVE-2024-48463](https://insights.sbomify.com/CVE-2024-48463/): Open redirect in n/a (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34841 and fix it if it is affected.

What it is: CVE-2026-34841 is a critical vulnerability in usebruno bruno, published on 6 Apr 2026. 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-2026-34841 in the wild and no public exploit code.

Affected packages and fixed versions:
- @usebruno/cli (npm): affected all versions; fixed in 3.2.1
- @usebruno/cli (npm): affected all versions; fixed in 3.2.1

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-2026-34841/ (Markdown: https://insights.sbomify.com/CVE-2026-34841/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34841
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34841
- OSV: https://osv.dev/vulnerability/CVE-2026-34841

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34841/
Summaries are generated and may contain mistakes; the official description above is the record.