UBUNTU-CVE-2026-35611

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Source

https://ubuntu.com/security/CVE-2026-35611

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35611.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-35611

Upstream

CVE-2026-35611

Published

2026-04-07T17:16:00Z

Modified

2026-05-20T16:25:37.292042588Z

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

Addressable is an alternative implementation to the URI implementation that is part of Ruby's standard library. From 2.3.0 to before 2.9.0, within the URI template implementation in Addressable, two classes of URI template generate regular expressions vulnerable to catastrophic backtracking. Templates using the * (explode) modifier with any expansion operator (e.g., {foo*}, {+var*}, {#var*}, {/var*}, {.var*}, {;var*}, {?var*}, {&var*}) generate patterns with nested unbounded quantifiers that are O(2^n) when matched against a maliciously crafted URI. Templates using multiple variables with the + or # operators (e.g., {+v1,v2,v3}) generate patterns with O(n^k) complexity due to the comma separator being within the matched character class, causing ambiguous backtracking across k variables. When matched against a maliciously crafted URI, this can result in catastrophic backtracking and uncontrolled resource consumption, leading to denial of service. This vulnerability is fixed in 2.9.0.

References

Affected packages

Ubuntu:16.04:LTS

ruby-addressable

Package

Name: ruby-addressable
Purl: pkg:deb/ubuntu/ruby-addressable?arch=source&distro=xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.3.8-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "ruby-addressable",
            "binary_version": "2.3.8-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35611.json"

Ubuntu:18.04:LTS

ruby-addressable

Package

Name: ruby-addressable
Purl: pkg:deb/ubuntu/ruby-addressable?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.5.1-2

2.5.2-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "ruby-addressable",
            "binary_version": "2.5.2-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35611.json"

Ubuntu:20.04:LTS

ruby-addressable

Package

Name: ruby-addressable
Purl: pkg:deb/ubuntu/ruby-addressable?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.5.2-1

2.7.0-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "ruby-addressable",
            "binary_version": "2.7.0-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35611.json"

Ubuntu:22.04:LTS

ruby-addressable

Package

Name: ruby-addressable
Purl: pkg:deb/ubuntu/ruby-addressable?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.7.0-2

2.8.0-3

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "ruby-addressable",
            "binary_version": "2.8.0-3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35611.json"

Ubuntu:24.04:LTS

ruby-addressable

Package

Name: ruby-addressable
Purl: pkg:deb/ubuntu/ruby-addressable?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.8.1-1

2.8.5-1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "ruby-addressable",
            "binary_version": "2.8.5-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35611.json"

Ubuntu:25.10

ruby-addressable

Package

Name: ruby-addressable
Purl: pkg:deb/ubuntu/ruby-addressable?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.8.5-1

2.8.7-2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "ruby-addressable",
            "binary_version": "2.8.7-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35611.json"

Ubuntu:26.04:LTS

ruby-addressable

Package

Name: ruby-addressable
Purl: pkg:deb/ubuntu/ruby-addressable?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.8.7-2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "ruby-addressable",
            "binary_version": "2.8.7-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35611.json"