UBUNTU-CVE-2026-91777

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Source
https://ubuntu.com/security/CVE-2026-91777
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-91777.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-91777
Upstream
Published
2026-09-23T03:17:00Z
Modified
2026-09-24T02:02:54Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Forward-reference completion for @JsonIdentityInfo object IDs in FasterXML jackson-databind performs a linear scan of the pending-reference accumulator for every resolved ID. The affected paths are CollectionDeserializer.CollectionReferringAccumulator.resolveForwardReference() and the equivalent implementation in MapDeserializer. When a document first creates N unresolved object-ID references in an identity-enabled collection or map and then defines those same IDs in reverse order, completion performs on the order of N * (N + 1) / 2 identity comparisons, so a shallow document whose size grows linearly causes quadratic CPU work during deserialization. The reporter instrumented equals() calls on the ID class and measured exactly 2,003,000 comparisons at N = 2,000, against zero comparisons in the pending-reference lookup path for an equally sized control in which every reference was already resolved. The input requires no deep nesting and no syntactically unusual JSON. Exploitation requires an application that deserializes attacker-influenced JSON into an identity-enabled collection or map. The fix replaces the repeated linear lookup with a keyed pending-reference structure.

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-2026-91777.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-2026-91777.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-2026-91777.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-2026-91777.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-2026-91777.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-2026-91777.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-2026-91777.json"