---
title: "CVE-2026-34841: Axios npm Supply Chain Incident Impacting @usebruno/cli"
url: https://erroneo.us/security/cve/CVE-2026-34841/
description: "CVE-2026-34841 (@usebruno/cli (npm)): Bruno is an open source IDE for exploring and testing APIs. Prior to 3.2.1, Bruno was affected by a supply chain…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-04-06
date_modified: 2026-04-08
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-34841"
kev: false
cvss: 9.8
epss: 0.00321
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.3% , percentile 24: FIRST’s model estimates a 0.3% chance of exploitation activity in the next 30 days, higher than 24% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes @usebruno/cli (npm) < 3.2.0, fixed in 3.2.1 . Check your lockfile, including transitive dependencies.

## What it is

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

## Affected packages

- npm `@usebruno/cli` < 3.2.0 → fixed: 3.2.1

## Affected products (CVE record)

- usebruno bruno: < 3.2.1

## Severity

- GitHub_M CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.32% probability of exploitation activity in the next 30 days; percentile 24.

## Sources

- [GitHub Advisory GHSA-658g-p7jg-wx5g](https://github.com/advisories/GHSA-658g-p7jg-wx5g)
- [CVE.org record CVE-2026-34841](https://www.cve.org/CVERecord?id=CVE-2026-34841)
- [NVD entry CVE-2026-34841](https://nvd.nist.gov/vuln/detail/CVE-2026-34841)
- [github.com](https://github.com/usebruno/bruno/security/advisories/GHSA-658g-p7jg-wx5g)
- [github.com](https://github.com/axios/axios/issues/10604)
- [github.com](https://github.com/usebruno/bruno/pull/7632)
- [aikido.dev](https://www.aikido.dev/blog/axios-npm-compromised-maintainer-hijacked-rat)
- [github.com](https://github.com/advisories/GHSA-fw8c-xr5c-95f9)

---
Source page: https://erroneo.us/security/cve/CVE-2026-34841/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt