c3p0 — security advisory
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>`. 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, represent
- Products
- c3p0
- Affected versions
- 0.9.1.2-10, 0.9.1.2-10ubuntu0.20.04.1, 0.9.1.2-10ubuntu1, 0.9.1.2-10ubuntu2, 0.9.1.2-11, 0.9.1.2-9, 0.9.1.2-9+deb8u1build0.16.04.1, 0.9.1.2-9+deb8u1build0.18.04.1, 0.9.1.2-9+deb8u1ubuntu0.16.04.1~esm1, 0.9.1.2-9+deb8u1ubuntu0.18.04.1
- Fixed versions
- 0.9.1.2-10ubuntu0.20.04.1+esm1, 0.9.1.2-10ubuntu1+esm1, 0.9.1.2-10ubuntu2+esm1, 0.9.1.2-11ubuntu0.1~esm1, 0.9.1.2-9+deb8u1ubuntu0.16.04.1~esm2, 0.9.1.2-9+deb8u1ubuntu0.18.04.1+esm1
- CVEs
- CVE-2026-27830
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:56 UTC · Revision 1
Source evidence
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>`. 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, represent
osv:UBUNTU-CVE-2026-27830
c3p0
Fixed versions: 0.9.1.2-9+deb8u1ubuntu0.16.04.1~esm2
c3p0
Fixed versions: 0.9.1.2-9+deb8u1ubuntu0.18.04.1+esm1
c3p0
Fixed versions: 0.9.1.2-10ubuntu0.20.04.1+esm1
c3p0
Fixed versions: 0.9.1.2-10ubuntu1+esm1
c3p0
Fixed versions: 0.9.1.2-10ubuntu2+esm1
c3p0
Fixed versions: Not specified
c3p0
Fixed versions: Not specified
c3p0
Fixed versions: 0.9.1.2-11ubuntu0.1~esm1
Complete source record
{
"id": "36f6a465d8758c26fd6d67c00721fb1dc5b86ac6921d91a7d238be8a4be1a821",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-27830",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-27830",
"summary": "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>`. 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, represent",
"evidence": "osv:UBUNTU-CVE-2026-27830",
"products": [
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{
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{
"value": "0.9.1.2-10ubuntu2",
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},
{
"name": {
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"evidence": "/affected/5/package/name"
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{
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{
"name": {
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{
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{
"name": {
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{
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"affected_versions": [
{
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"evidence": "/affected/7/versions"
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{
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],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-27830",
"aliases": [
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"metrics": [
{
"type": "CVSS_V4",
"score": "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"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
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"affected": [
{
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{
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}
]
}
],
"package": {
"name": "c3p0",
"purl": "pkg:deb/ubuntu/c3p0?arch=source&distro=esm-apps-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"0.9.1.2-9",
"0.9.1.2-9+deb8u1build0.16.04.1",
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],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27830.json"
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"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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}
]
}
],
"package": {
"name": "c3p0",
"purl": "pkg:deb/ubuntu/c3p0?arch=source&distro=esm-apps%2Fbionic",
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},
"versions": [
"0.9.1.2-9",
"0.9.1.2-9+deb8u1build0.18.04.1",
"0.9.1.2-9+deb8u1ubuntu0.18.04.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27830.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libc3p0-java",
"binary_version": "0.9.1.2-9+deb8u1ubuntu0.18.04.1+esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
"introduced": "0"
},
{
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}
]
}
],
"package": {
"name": "c3p0",
"purl": "pkg:deb/ubuntu/c3p0?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"0.9.1.2-10",
"0.9.1.2-10ubuntu0.20.04.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27830.json"
},
"ecosystem_specific": {
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{
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],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
},
{
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{
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{
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]
}
],
"package": {
"name": "c3p0",
"purl": "pkg:deb/ubuntu/c3p0?arch=source&distro=esm-apps%2Fjammy",
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"0.9.1.2-10ubuntu1",
"0.9.1.2-10ubuntu2"
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27830.json"
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27830.json"
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"name": "c3p0",
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"0.9.1.2-11"
],
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"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27830.json"
},
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{
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]
}
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{
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{
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},
{
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]
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],
"package": {
"name": "c3p0",
"purl": "pkg:deb/ubuntu/c3p0?arch=source&distro=esm-apps%2Fresolute",
"ecosystem": "Ubuntu:Pro:26.04:LTS"
},
"versions": [
"0.9.1.2-10ubuntu2",
"0.9.1.2-11"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-27830.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libc3p0-java",
"binary_version": "0.9.1.2-11ubuntu0.1~esm1"
}
],
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
}
}
],
"modified": "2026-10-17T12:56:18.113053110Z",
"provider": "osv",
"upstream": [
"CVE-2026-27830"
],
"references": [
"https://ubuntu.com/security/CVE-2026-27830",
"https://www.cve.org/CVERecord?id=CVE-2026-27830",
"https://github.com/swaldman/c3p0/commit/e14cbd8166e423e2e9a9d6f08b2add3433492d6e",
"https://github.com/swaldman/c3p0/security/advisories/GHSA-5476-xc4j-rqcv",
"https://mogwailabs.de/en/blog/2025/02/c3p0-you-little-rascal",
"https://www.mchange.com/projects/c3p0/#configuring_security",
"https://www.mchange.com/projects/c3p0/#security-note",
"https://ubuntu.com/security/notices/USN-8642-1"
]
},
"related_cves": [
{
"value": "CVE-2026-27830",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 355175,
"published_at": "2026-02-26T01:16:00+00:00"
}