CVE-2026-55849
CLI argument injection in cyclonedx-npm allows arbitrary OS command execution.
Is CVE-2026-55849 being exploited?
Not confirmed. CVE-2026-55849 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.24% probability of exploitation in the next 30 days.
How severe is CVE-2026-55849?
CVE-2026-55849 is rated High. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-55849?
Yes. A fix has been recorded for CVE-2026-55849. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55849 affect?
CVE-2026-55849 affects @cyclonedx/cyclonedx-npm 2.1.0 - <5.0.0, Developer machines, CI/CD runners, Build servers using the CLI. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55849?
Upgrade to @cyclonedx/cyclonedx-npm v5.0.0 immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Arbitrary OS command execution as invoking user via unsanitized --workspace value in CLI when npm_execpath is unset.
Immediate action required
- affected>= 2.1.0 and < 5.0.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.