Widely used container management platform; potential RCE and cluster takeover.
CVE-2026-44939
Rancher Manager import endpoint allows remote code execution via unsanitized YAML.
Is CVE-2026-44939 being exploited?
Not confirmed. CVE-2026-44939 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 1.3% probability of exploitation in the next 30 days.
How severe is CVE-2026-44939?
CVE-2026-44939 is rated Critical with a CVSS score of 9.4. 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-2026-44939?
Yes. A fix has been recorded for CVE-2026-44939. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-44939 affect?
CVE-2026-44939 affects Rancher Manager. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-44939?
Upgrade to 2.14.2+, restrict /v3/import, rotate tokens.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution and container breakout via /v3/import with crafted YAML.
Immediate action required
- affected>= 2.14.0 and < 2.14.2
- affected>= 2.13.0 and < 2.13.6
- affected>= 2.12.0 and < 2.12.10
- affected>= 2.11.0 and < 2.11.14
- affected>= 2.10.0 and < 2.10.12
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.