CVE-2026-34841: Bruno is an open source IDE for exploring and testing APIs

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CRITICAL 9.8REMOTEUPGRADE

CVE-2026-34841 is a critical-severity flaw (CVSS 9.8) affecting bruno. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-494, CWE-506
Published	2026-04-06
Last modified	2026-10-23

Publisher (CNA): GitHub, Inc. · Vendor: usebruno

Am I affected?

Timeline

2026-04-06 17:17 UTCPublished CVE record published
2026-10-23 23:10 UTCUpdated Record last modified

usebruno bruno UPGRADE

Affected: < 3.2.1

Fixed in: 3.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bruno || rpm -q bruno || bruno --version

2. UPGRADE to 3.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bruno

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bruno

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

npm · @usebruno/cli · FIXED · 3.2.1 · vulnerable: < 3.2.0 · source

npm install @usebruno/cli@">=3.2.1" npm ls @usebruno/cli

Fedora 46 · kwin-zones · FIXED · 1.0.13-1.fc46 · FEDORA-2026-95888f332b · source

sudo dnf upgrade --advisory=FEDORA-2026-95888f332b

Fedora ELN · nginx-mod-brotli · FIXED · 1.0.0~rc-16.eln159 · FEDORA-2026-501a6a8273 · source

sudo dnf upgrade --advisory=FEDORA-2026-501a6a8273

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

References

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