CVE-2026-45390
OCaml-tar <3.4.0 path traversal enables writes outside extraction dir.
Is CVE-2026-45390 being exploited?
Not confirmed. CVE-2026-45390 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 0.37% probability of exploitation in the next 30 days.
How severe is CVE-2026-45390?
CVE-2026-45390 is rated Critical with a CVSS score of 9.1. 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-2026-45390?
Yes. A fix has been recorded for CVE-2026-45390. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-45390 affect?
CVE-2026-45390 affects OCaml-tar (<3.4.0). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-45390?
Upgrade to OCaml-tar 3.4.0+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Arbitrary file writes outside the extraction directory via crafted tar uploads that reach the decompression endpoint.
Patch when possible