CVE-2026-126353

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.

• CWE-1333

• https://github.com/sporkmonger/addressable/commit/49aecf97bf6f6675717f1078a0b45f95c428e103
• https://github.com/sporkmonger/addressable/releases/tag/addressable-2.9.1
• https://github.com/sporkmonger/addressable/security/advisories/GHSA-4w5q-wg7v-w6gp

Published

Nov 12, 2026

Last Modified

Nov 13, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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