CVE-2026-46386
OpenProject RCE via default Rails key in Docker, enabling Marshal deserialization.
Is CVE-2026-46386 being exploited?
Not confirmed. CVE-2026-46386 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 0.49% probability of exploitation in the next 30 days.
How severe is CVE-2026-46386?
CVE-2026-46386 is rated Critical with a CVSS score of 9.9. 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-2026-46386?
Yes. A fix has been recorded for CVE-2026-46386. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-46386 affect?
CVE-2026-46386 affects OpenProject Docker image, OpenProject web app (Rails). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-46386?
Patch OpenProject image to fixed version
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
RCE via Marshal deserialization in Rails cookie path (/my/two_factor_devices) due to default SECRET_KEY_BASE in Docker image.
Immediate action required
- affected>= 8.3.0 and < 17.2.4
- affected>= 17.3.0 and < 17.3.2
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.