UBUNTU-CVE-2026-110879

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Source
https://ubuntu.com/security/CVE-2026-110879
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110879.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-110879
Upstream
Published
2026-10-28T01:16:00Z
Modified
2026-10-28T20:17:41Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

jackson-databind validates the outer class of a class-name type ID but accepts attacker-selected classes inside its generic arguments, even when those classes violate the declared type or would be rejected as direct type IDs. This bypasses the generic-argument validation added for CVE-2026-54512 (GHSA-j3rv-43j4-c7qm), of which this is an incomplete fix. DatabindContext._resolveAndValidateGeneric() checks the outer class against the declared base type and then passes each argument from the type ID to _validateTypeParameter(), which validates the argument against the outer base type rather than enforcing its corresponding declared generic binding. It also invokes validators with arguments that have not passed the subtype check those validators expect. Under the default DefaultBaseTypeLimitingValidator this accepts an unrelated class inside a generic subtype even when the same class is rejected as a direct type ID. Where an allowIfBaseType(...) rule approves the outer type, Jackson substitutes LaissezFaireSubTypeValidator, so the configured validator no longer restricts the embedded arguments. The element type of a plain array type ID such as [Lpkg.Gadget; is likewise left unvalidated once the array's base type is approved. Affected paths include annotation-based class-name polymorphism with a default Jackson 3.x JsonMapper, configured default typing in both Jackson 2.x and 3.x, and integrations that expose that default typing. The default-validator case requires no application-authored validator: with @JsonTypeInfo(use = Id.CLASS), a direct gadget type ID is rejected as "Not a subtype", while a type ID naming a generic wrapper around the same gadget is accepted and deserialized, including attacker-supplied bean properties. Where class-name default typing permits Map, a property declared as Map<String,String> accepts HashMap<FileSystemXmlApplicationContext,String>; map-key discovery then passes the attacker-controlled JSON property name to the selected class's one-string constructor. With Spring on the classpath and attacker-controlled XML the application can load, that constructor loads the XML and invokes ProcessBuilder.start() under the application account, giving arbitrary command execution. This issue affects com.fasterxml.jackson.core:jackson-databind from 2.10.0 and tools.jackson.core:jackson-databind from 3.0.0. Releases before 2.10.0 are not affected, because PolymorphicTypeValidator was introduced in jackson-databind 2.10.0.

References

Affected packages

Ubuntu:18.04:LTS
jackson-databind

Package

Name
jackson-databind
Purl
pkg:deb/ubuntu/jackson-databind?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.8.6-1
2.9.1-1
2.9.4-1
2.9.5-1
2.9.8-1~18.04

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-databind-java",
            "binary_version":  "2.9.8-1~18.04"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110879.json"
Ubuntu:20.04:LTS
jackson-databind

Package

Name
jackson-databind
Purl
pkg:deb/ubuntu/jackson-databind?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.9.9.3-1
2.10.0-2
2.10.1-1
2.10.2-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-databind-java",
            "binary_version":  "2.10.2-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110879.json"
Ubuntu:22.04:LTS
jackson-databind

Package

Name
jackson-databind
Purl
pkg:deb/ubuntu/jackson-databind?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.12.1-1
2.12.5-1
2.13.0-1
2.13.0-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-databind-java",
            "binary_version":  "2.13.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110879.json"
Ubuntu:24.04:LTS
jackson-databind

Package

Name
jackson-databind
Purl
pkg:deb/ubuntu/jackson-databind?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.14.0-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-databind-java",
            "binary_version":  "2.14.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110879.json"
Ubuntu:26.04:LTS
jackson-databind

Package

Name
jackson-databind
Purl
pkg:deb/ubuntu/jackson-databind?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.14.0+ds-1
2.14.0+ds-1build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-databind-java",
            "binary_version":  "2.14.0+ds-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110879.json"
Ubuntu:26.10
jackson-databind

Package

Name
jackson-databind
Purl
pkg:deb/ubuntu/jackson-databind?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.14.0+ds-1build1
2.14.0+ds-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-databind-java",
            "binary_version":  "2.14.0+ds-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110879.json"
Ubuntu:Pro:14.04:LTS
jackson-databind

Package

Name
jackson-databind
Purl
pkg:deb/ubuntu/jackson-databind?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.2.2-1
2.2.2-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-databind-java",
            "binary_version":  "2.2.2-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110879.json"
Ubuntu:Pro:16.04:LTS
jackson-databind

Package

Name
jackson-databind
Purl
pkg:deb/ubuntu/jackson-databind?arch=source&distro=esm-apps%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.4.2-2
2.4.2-3
2.4.2-3ubuntu0.1~esm1
2.4.2-3ubuntu0.1~esm2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-databind-java",
            "binary_version":  "2.4.2-3ubuntu0.1~esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-110879.json"