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Addressable: Regular Expression Denial of Service in Addressable templates with several exploded variables

No KEV listing collectedCVSS 5.9Fix not stated

Assessment

Severity
Moderate
CVSS base score
5.9
Impact
Not stated
Exploitation detected
Unknown: not stated by MSRC
Exploitability
Not assessed
Publicly disclosed
Unknown: not stated by MSRC
EPSS · 30-day forecast
No EPSS score collected
Customer action
Required: follow the MSRC remediation guidance
More details
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Public detection template
No Nuclei template is listed in the current collected catalog
Component
Mariner
Weakness
CWE-1333: Inefficient Regular Expression Complexity
Issued by
GitHub_M
Published
13 Nov 2026 · November 2026
Last revised
15 Nov 2026Information published.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
HighAC:H
Privileges required
NonePR:N
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
NoneC:N
Integrity
NoneI:N
Availability
HighA:H

Updates that fix it

0 KBs

No KB listed

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Open Source Software
1 affected product
  • azl4 rubygem-addressable 2.8.6-9.azl4 on Azure Linux 4.0
Page history

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  1. 15 Nov 2026 · 08:08:43 UTC Last revised13 Nov 2026 20:43 UTC → 15 Nov 2026 01:04 UTC

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Exploitation and risk

Source status

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cve-program · CVE-2026-126353

Published

Addressable: Regular Expression Denial of Service in Addressable templates with several exploded variables

Addressable is an alternative implementation to the URI implementation that is part of Ruby's standard library. From 2.3.0 until 2.9.1, URI template expressions containing several exploded variables generate ambiguous regular expressions that can divide a run of members among the variables in polynomially many ways. Template#match or Template#extract processing of an attacker-controlled URI can therefore consume a thread and cause denial of service. The flaw affects MRI Ruby before 3.2 and JRuby, TruffleRuby 40.0, and plus or number-sign expressions on MRI Ruby 3.2. MRI Ruby 3.3 and later, URI parsing, and Template#expand are unaffected. This issue is fixed in version 2.9.1.

Source published
12 Nov 2026 22:10:14 UTC
Source modified
12 Nov 2026 22:10:14 UTC
Saved here
13 Nov 2026 00:16:18 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

ChangeIntel

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Sources read 15 Nov 18:02 UTC · 254 of 275 readable · 250 fully read · documentation 469/469 current