CVE-2026-39983
FTP command injection in basic-ftp before 5.2.1 via CRLF in paths.
Is CVE-2026-39983 being exploited?
Not confirmed. CVE-2026-39983 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 2.2% probability of exploitation in the next 30 days.
How severe is CVE-2026-39983?
CVE-2026-39983 is rated High with a CVSS score of 8.6. 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-2026-39983?
Yes. A fix has been recorded for CVE-2026-39983. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-39983 affect?
CVE-2026-39983 affects basic-ftp (Node.js) <= 5.2.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-39983?
Upgrade to 5.2.1+; audit path inputs in code.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
CRLF-based FTP command injection via crafted paths; attacker can inject/execute multiple FTP commands on the FTP server.
Patch when possible
- affected< 5.2.1
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.