Is CVE-2026-126353 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-126353 being exploited in the wild.

How severe is CVE-2026-126353?

Medium severity, with a CVSS score of 5.9, published 12 November 2026.

Which products and versions are affected?

Sporkmonger Addressable 2.3.0 to 2.9.0.

Is there a fix for CVE-2026-126353?

Yes: fixed in 2.9.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-126353 attacked?

It is attacked over the network.

Am I affected by CVE-2026-126353?

Check whether you run Sporkmonger Addressable at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-126353: Addressable URI template regular expression denial of service

CVE-2026-126353 · Severity: medium · CVSS 5.9 · Published 2026-11-12

Addressable is a Ruby library that parses and manipulates URIs and URI templates. Versions 2.3.0 through 2.9.0 are vulnerable to a denial of service attack when processing attacker-controlled URI template expressions with multiple exploded variables, which can cause the template matching to consume excessive CPU and hang a thread. An attacker could exploit this to make an application unresponsive.

Quick answers

Is CVE-2026-126353 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-126353 being exploited in the wild.
How severe is CVE-2026-126353?: Medium severity, with a CVSS score of 5.9, published 12 November 2026.
Which products and versions are affected?: Sporkmonger Addressable 2.3.0 to 2.9.0.
Is there a fix for CVE-2026-126353?: Yes: fixed in 2.9.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-126353 attacked?: It is attacked over the network.
Am I affected by CVE-2026-126353?: Check whether you run Sporkmonger Addressable at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 2.9.1

Technical details

The vulnerability exists in URI template expression processing where exploded variables with certain operators (/, ., ;, ?, &, +, #) generate ambiguous regular expressions that match input strings in polynomially or exponentially many ways. On regex engines without match memoization (MRI Ruby before 3.2, JRuby, TruffleRuby), processing Template#match or Template#extract with a crafted input triggers catastrophic backtracking. Ruby 3.2 is affected for plus and number-sign expressions; Ruby 3.3+ and URI#parse are unaffected.

Affected products

sporkmonger Addressable 2.3.0 to 2.9.0

Timeline

2026-11-12: disclosed
2026-10-30: patched

References

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