How severe is CVE-2026-34841?

CVE-2026-34841 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34841 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34841?

CVE-2026-34841 affects Usebruno Bruno. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34841?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-34841 have an EU (EUVD) identifier?

Yes. CVE-2026-34841 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19354.

When was CVE-2026-34841 published?

CVE-2026-34841 was published on 2026-04-06 and last updated on 2026-06-17.

CVE-2026-34841

CVE-2026-34841 is a critical-severity vulnerability in Usebruno Bruno with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-494.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19354
Weakness: CWE-494
Affected product: Usebruno Bruno
Published: 2026-04-06
Last modified: 2026-06-17

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

Frequently asked questions

What is CVE-2026-34841?: 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
How severe is CVE-2026-34841?: CVE-2026-34841 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34841 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34841?: CVE-2026-34841 affects Usebruno Bruno. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34841?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-34841 have an EU (EUVD) identifier?: Yes. CVE-2026-34841 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19354.
When was CVE-2026-34841 published?: CVE-2026-34841 was published on 2026-04-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:usebruno:bruno:*:*:*:*:*:*:*:*

More vulnerabilities in Usebruno Bruno

CVE-2024-48463 — Medium (CVSS 6.5): Bruno before 1.29.1 uses Electron shell.openExternal without validation (of http or https) for opening windows within…
CVE-2025-30210 — Medium (CVSS 6.1): Bruno is an open source IDE for exploring and testing APIs. Prior to 1.39.1, the custom tool-tip components which…
CVE-2025-30354 — Medium (CVSS 4.3): Bruno is an open source IDE for exploring and testing APIs. A bug in the assertion runtime caused assert expressions to…

All CVEs affecting Usebruno Bruno →

Other CWE-494 vulnerabilities

CVE-2020-1595 — Critical (CVSS 9.9): <p>A remote code execution vulnerability exists in Microsoft SharePoint where APIs aren't properly protected from…
CVE-2020-1210 — Critical (CVSS 9.9): <p>A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source…
CVE-2026-42248 — Critical (CVSS 9.8): Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike…
CVE-2026-3000 — Critical (CVSS 9.8): IDExpert Windows Logon Agent developed by Changing has a Remote Code Execution vulnerability, allowing unauthenticated…
CVE-2026-2999 — Critical (CVSS 9.8): IDExpert Windows Logon Agent developed by Changing has a Remote Code Execution vulnerability, allowing unauthenticated…
CVE-2026-27180 — Critical (CVSS 9.8): MajorDoMo (aka Major Domestic Module) is vulnerable to unauthenticated remote code execution through supply chain…

Browse all CWE-494 vulnerabilities →