CVE-2026-27830
RCE via crafted Java-serialized objects in c3p0 pre-0.12.0 (deserialization/JNDI).
Is CVE-2026-27830 being exploited?
Not confirmed. CVE-2026-27830 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 0.53% probability of exploitation in the next 30 days.
How severe is CVE-2026-27830?
CVE-2026-27830 is rated High with a CVSS score of 8.9. 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-2026-27830?
Yes. A fix has been recorded for CVE-2026-27830. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-27830 affect?
CVE-2026-27830 affects c3p0 ConnectionPoolDataSource (pre-0.12.0), mchange-commons-java (pre-0.4.0). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-27830?
Patch to c3p0 0.12.0+ and update mchange-commons-java 0.4.0+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution via deserialized Java objects and JNDI references, allowing code load from a remote factoryClassLocation.
Immediate action required
- affected< 0.12.0
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.