CVE-2026-42994: Bitwarden CLI 2026.4.0 from 2026-04-22T21:57Z to 2026-04-22T23:30Z, when obtained from npm, had embedded malic

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-42994 is a critical-severity flaw (CVSS 9.8) affecting cli. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Bitwarden CLI 2026.4.0 from 2026-04-22T21:57Z to 2026-04-22T23:30Z, when obtained from npm, had embedded malicious code. This is related to a Checkmarx supply chain incident.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

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 77%)
CISA exploited list	No
Weakness	CWE-78, CWE-94
Published	2026-05-01
Last modified	2026-10-26

Publisher (CNA): MITRE · Vendor: bitwarden

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-01 05:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

bitwarden cli DOWNGRADE

Affected: 2026.4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2026.4.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2026.4.0 (Debian / Ubuntu)

apt-cache madison cli sudo apt install cli=<VERSION_BEFORE_2026.4.0> sudo apt-mark hold cli

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cli sudo dnf downgrade cli-<VERSION_BEFORE_2026.4.0> sudo dnf versionlock add cli

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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.

Quick answers

How do I fix CVE-2026-42994?

cli: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-42994 being exploited?

CVE-2026-42994 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42994 affect?

CVE-2026-42994 affects cli. Severity is critical (CVSS 9.8). Bitwarden CLI 2026.4.0 from 2026-04-22T21:57Z to 2026-04-22T23:30Z, when obtained from npm, had embedded malicious code. This is related to a Checkmarx supply chain incident.

How urgent is CVE-2026-42994?

Priority 45/100. Critical severity; Remotely exploitable, no login, no user action

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References

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