CVE-2026-26956
vm2 <=3.10.4 sandbox escape enables RCE; fixed in 3.10.5.
Is CVE-2026-26956 being exploited?
Not confirmed. CVE-2026-26956 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 0.92% probability of exploitation in the next 30 days.
How severe is CVE-2026-26956?
CVE-2026-26956 is rated Critical with a CVSS score of 9.8. 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-2026-26956?
Yes. A fix has been recorded for CVE-2026-26956. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-26956 affect?
CVE-2026-26956 affects vm2 <= 3.10.4. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-26956?
Upgrade to vm2 3.10.5+ immediately
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via sandbox escape; attacker can escape vm2 VM.run() and run host commands.
Immediate action required
- affected= 3.10.4
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.