UBUNTU-CVE-2026-89407

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Source
https://ubuntu.com/security/CVE-2026-89407
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-89407.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-89407
Upstream
Published
2026-09-22T15:17:00Z
Modified
2026-09-24T02:00:54Z
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

NumberInput.looksLikeValidNumber() in FasterXML jackson-core pre-validates "stringified numbers" with two regular expressions: PATTERN_FLOAT ([+-]?[0-9][.]?[0-9]+([eE][+-]?[0-9]+)?), present since 2.17.0, and PATTERN_FLOAT_TRAILING_DOT, added in 2.17.2. PATTERN_FLOAT places adjacent quantifiers over the same character class -- an optional [0-9] run, an optional dot, then a required [0-9]+ run -- so input that ultimately fails to match forces Java's backtracking engine to retry every possible split point of the digit run. Matching cost therefore grows with the square of the input length. An attacker who can supply JSON that an application deserializes into a numeric target type reaches this method through jackson-databind's default String-to-number coercion (StdDeserializer and NumberDeserializers for BigDecimal, BigInteger, Double and Float). Because StreamReadConstraints.maxStringLength defaults to 20,000,000 characters, no constraint bounds the input before it reaches the regex. Testing by the reporter confirmed O(n^2) growth across five consecutive input-size doublings, with a single 160,000-character string consuming roughly 74 seconds in one call; a small number of concurrent requests of ordinary body size can therefore exhaust a server's request-handling thread pool. The affected method does not exist before 2.17.0, so 2.16.x and earlier releases are not affected. The fix replaces both regular expressions with a hand-rolled single-pass scan.

References

Affected packages

Ubuntu:16.04:LTS
jackson-core

Package

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

Affected ranges

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

Affected versions

2.*
2.4.2-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-core-java",
            "binary_version":  "2.4.2-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-89407.json"
Ubuntu:18.04:LTS
jackson-core

Package

Name
jackson-core
Purl
pkg:deb/ubuntu/jackson-core?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
2.9.8-3~18.04

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-core-java",
            "binary_version":  "2.9.8-3~18.04"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-89407.json"
Ubuntu:20.04:LTS
jackson-core

Package

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

Affected ranges

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

Affected versions

2.*
2.9.8-3
2.10.0-1
2.10.1-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-core-java",
            "binary_version":  "2.10.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-89407.json"
Ubuntu:22.04:LTS
jackson-core

Package

Name
jackson-core
Purl
pkg:deb/ubuntu/jackson-core?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
2.13.0-1
2.13.0-2

Ecosystem specific 

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

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-89407.json"
Ubuntu:24.04:LTS
jackson-core

Package

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

Affected ranges

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

Affected versions

2.*
2.14.1-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-core-java",
            "binary_version":  "2.14.1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-89407.json"
Ubuntu:26.04:LTS
jackson-core

Package

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

Affected ranges

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

Affected versions

2.*
2.14.1-1
2.14.1-1build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libjackson2-core-java",
            "binary_version":  "2.14.1-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-89407.json"