CVE-2026-27830
No exploitation reported by the sources we read.
- Published2026-02-26
- Fixed in0.12.0
- WeaknessCWE-502 · CWE-94
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
c3p0, a JDBC Connection pooling library, is vulnerable to attack via maliciously crafted Java-serialized objects and `javax.naming.Reference` instances. Several c3p0 `ConnectionPoolDataSource` implementations have a property called `userOverridesAsString` which conceptually represents a `Map<String,Map<String,String>>`. Prior to v0.12.0, that property was maintained as a hex-encoded serialized object. Any attacker able to reset this property, on an existing `ConnectionPoolDataSource` or via maliciously crafted serialized objects or `javax.naming.Reference` instances could be tailored execute unexpected code on the application's `CLASSPATH`. The danger of this vulnerability was strongly magnified by vulnerabilities in c3p0's main dependency, mchange-commons-java. This library includes code that mirrors early implementations of JNDI functionality, including ungated support for remote `factoryClassLocation` values. Attackers could set c3p0's `userOverridesAsString` hex-encoded serialized objects that include objects "indirectly serialized" via JNDI references. Deserialization of those objects and dereferencing of the embedded `javax.naming.Reference` objects could provoke download and execution of malicious code from a remote `factoryClassLocation`. Although hazard presented by c3p0's vulnerabilites are exarcerbated by vulnerabilities in mchange-commons-java, use of Java-serialized-object hex as the format for a writable Java-Bean property, of objects that may be exposed across JNDI interfaces, represents a serious independent fragility. The `userOverridesAsString` property of c3p0 `ConnectionPoolDataSource` classes has been reimplemented to use a safe CSV-based format, rather than rely upon potentially dangerous Java object deserialization. c3p0-0.12.0+ and above depend upon mchange-commons-java 0.4.0+, which gates support for remote `factoryClassLocation` values by configuration parameters that default to restrictive values. c3p0 additionally enforces the new mchange-commons-java `com.mchange.v2.naming.nameGuardClassName` to prevent injection of unexpected, potentially remote JNDI names. There is no supported workaround for versions of c3p0 prior to 0.12.0.
Timeline
dates in UTC- 2026-02-2601:16CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-27830?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-27830?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 0.12 | < 0.12.0 | 0.12.0 | OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
c3p0: c3p0: Arbitrary Code Execution via deserialization of crafted objects
com.mchange/c3p0 as a component of Red Hat build of Debezium 2 · org.hibernate.orm/hibernate-c3p0 as a component of Red Hat build of Debezium 2 · org.hibernate.orm/hibernate-c3p0 as a component of Red Hat build of Debezium 3 · +7 more
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.1.16 security update
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.3.19 Update
Red Hat Security Advisory: Satellite 6.18.6 Async Update
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.6 security update
Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 8.1.6 security update
3 more advisories
Fix
- Update c3p0 to 0.12.0
- Vendor fix Red Hat Product Security RHSA-2026:73976 · 13 productsBefore applying this update, ensure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://access…
- Vendor fix Red Hat Product Security RHSA-2026:28385 · 3 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For detailed instructions how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_satellite/6.18/html/updating_red_hat_satellite/index
- Vendor fix Red Hat Product Security RHSA-2026:18054 · 4 productsBefore applying the update, make sure all previously released errata relevant to your system have been applied. Also, back up your existing installation, including all applications, configuration files, databases and database settings. For details on how to apply this update, refer to: https://acce…
- Vendor fix Red Hat Product Security RHSA-2026:4285 · 1 productTo apply this update, follow the standard installation procedure for your platform: * https://docs.redhat.com/en/documentation/red_hat_build_of_debezium/3.2.7/html-single/installing_debezium_on_openshift/index * https://docs.redhat.com/en/documentation/red_hat_build_of_debezium/3.2.7/html-single/i…
- Vendor fix Red Hat Product Security RHSA-2026:3890 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- No fix available, says the vendor Red Hat Product Security CVE-2026-27830 · 6 productsAffected
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CVSS 4.0 vector
- CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Published
- 2026-02-26
- Last Modified
- 2026-09-14
- NVD status
- Deferred
Frequently asked questions
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.