UBUNTU-CVE-2026-106554

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Source
https://ubuntu.com/security/CVE-2026-106554
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-106554.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-106554
Upstream
Published
2026-11-04T00:00:00Z
Modified
2026-11-05T11:45:35Z
Severity
  • Ubuntu - medium
Summary
[none]
Details

One CBOR-parsing issue in jackson-dataformats-binary's CBOR module: an unbounded run of CBOR tags drives quadratic-time TagList growth (CPU/GC-exhaustion DoS, PoC-proven). PoC executed against com.fasterxml.jackson.dataformat:jackson-dataformat-cbor:2.18.2; present in current 2.x and 3.x (tools.jackson.dataformat.cbor) HEAD. Distinct from the Avro and Smile/Protobuf advisories for this repo. Quadratic CPU/GC DoS from an unbounded chain of CBOR tags (PoC-proven). File: cbor/src/main/java/.../cbor/CBORParser.java (tag handling -> TagList). CBOR permits a data item to be preceded by any number of semantic tags. The CBOR parser accumulates them in a TagList whose backing array grows by a fixed increment (+8), not by doubling, and re-scans/copies on each growth. An attacker sends a value preceded by a long run of tag bytes; the fixed-increment growth makes accumulating N tags O(N^2) in time (plus GC pressure), with no cap on the number of stacked tags. PoC (executed, JDK 17): feeding a CBOR stream consisting of a long run of tag bytes (e.g. tag 0xC0+) before a trivial value forces quadratic CPU/GC; parse time grows super-linearly with the tag count, pinning a request thread with no configurable limit. Impact. Algorithmic-complexity denial of service (CWE-407): a modest input of stacked tags consumes quadratic CPU/GC, pinning a request thread; concurrent requests exhaust the pool. Fix. Grow TagList by doubling and/or cap the number of stacked tags (StreamReadConstraints-style).

References

Affected packages

Ubuntu:16.04:LTS
jackson-dataformat-cbor

Package

Name
jackson-dataformat-cbor
Purl
pkg:deb/ubuntu/jackson-dataformat-cbor?arch=source&distro=xenial

Affected ranges

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

Affected versions

2.*
2.4.3-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjackson2-dataformat-cbor",
            "binary_version": "2.4.3-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-106554.json"
Ubuntu:18.04:LTS
jackson-dataformat-cbor

Package

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

Affected ranges

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

Affected versions

2.*
2.7.8-1
2.7.8-2
2.7.8-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjackson2-dataformat-cbor",
            "binary_version": "2.7.8-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-106554.json"
Ubuntu:20.04:LTS
jackson-dataformat-cbor

Package

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

Affected ranges

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

Affected versions

2.*
2.7.8-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjackson2-dataformat-cbor",
            "binary_version": "2.7.8-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-106554.json"
Ubuntu:22.04:LTS
jackson-dataformat-cbor

Package

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

Affected ranges

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

Affected versions

2.*
2.7.8-3
2.7.8-4
2.7.8-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjackson2-dataformat-cbor",
            "binary_version": "2.7.8-5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-106554.json"
Ubuntu:24.04:LTS
jackson-dataformat-cbor

Package

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

Affected ranges

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

Affected versions

2.*
2.7.8-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjackson2-dataformat-cbor",
            "binary_version": "2.7.8-5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-106554.json"
Ubuntu:26.04:LTS
jackson-dataformat-cbor

Package

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

Affected ranges

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

Affected versions

2.*
2.7.8-5.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjackson2-dataformat-cbor",
            "binary_version": "2.7.8-5.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-106554.json"
Ubuntu:26.10
jackson-dataformat-cbor

Package

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

Affected ranges

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

Affected versions

2.*
2.7.8-5.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjackson2-dataformat-cbor",
            "binary_version": "2.7.8-5.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-106554.json"