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🛡️ CVE-2026-34841 — bruno

🔴 CVSS 9.8 — Critical ✅ No Known Exploit CWE-1395 NVD
9.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Axios npm Supply Chain Incident Impacting @usebruno/cli

Impact

This is 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.

Potential impact includes:

  • Execution of a malicious postinstall script
  • Remote Access Trojan (RAT) installation
  • Exfiltration of credentials and sensitive data

Not impacted:

  • Bruno desktop app users
  • Users who installed outside the attack window

Patches

The compromised axios versions (1.14.1, 0.30.4) have been removed from npm, and new installations will now resolve to safe versions.

Additionally, Bruno has taken further hardening steps:

  • Pinned axios to a known safe version to prevent accidental resolution to malicious releases
  • Fix implemented in: [https://github.com/usebruno/bruno/pull/7632](https://github.com/usebruno/bruno/pull/7632)

Recommendation

If users installed @usebruno/cli during the affected window:

1. Reinstall dependencies

2. Rotate all credentials and secrets:

For additional guidance on securing your system, refer to this article:

https://www.aikido.dev/blog/axios-npm-compromised-maintainer-hijacked-rat

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2026-34841 is classified as CWE-1395: Dependency on Vulnerable Third-Party Component. The product ships or relies on a component with known vulnerabilities, inheriting its exposure.

Affected software

CVE-2026-34841 is recorded against 2 packages.

  • @usebruno/cli
  • bruno (fixed in 3.2.1)

Timeline and source

Published on 2 April 2026 and last revised on 6 April 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Advisory)
github.com (Package)
www.aikido.dev (Web)

Same weakness in other software

These advisories are the same class of weakness (CWE-1395: Dependency on Vulnerable Third-Party Component) in other software:

Details

Severity CRITICAL
CVSS Score 9.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-1395
Public Exploit ✅ No
Source NVD
Published 2026-04-02
Updated 2026-08-20
Modified 2026-04-06

Affected Packages

Software From version Fixed in
@usebruno/cli — —
bruno — 3.2.1

Exploit Protection

Are you running bruno?

CVE-2026-34841 carries CVSS 9.8 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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