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Fencer Vulns
high 7.5

CVE-2026-35611 json

Addressable has a Regular Expression Denial of Service in Addressable templates

published 2026-04-07 7 mo ago modified 2026-10-26 13 d ago also EUVD-2026-19788 , GHSA-h27x-rffw-24p4

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

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.

Patch / fix

  • rubygems addressable 2.9.0
  • addressable_project addressable 2.9.0
  • ruby-addressable Debian 14 2.9.0-1

debian advisories DEBIAN-CVE-2026-35611

  • ruby-addressable Ubuntu Pro 16.04 LTS 2.3.8-1ubuntu0.1~esm1
  • ruby-addressable Ubuntu Pro 18.04 LTS 2.5.2-1ubuntu0.1~esm1
  • ruby-addressable Ubuntu Pro 20.04 LTS 2.7.0-1ubuntu0.1~esm1
  • ruby-addressable Ubuntu Pro 22.04 LTS 2.8.0-3ubuntu0.1~esm1
  • ruby-addressable Ubuntu Pro 24.04 LTS 2.8.5-1ubuntu0.1~esm1
  • ruby-addressable Ubuntu Pro 26.04 LTS 2.8.7-2ubuntu0.26.04.1~esm1

ubuntu advisories UBUNTU-CVE-2026-35611

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ruby-addressable Alpine 3.24, Alpine 3.23 2.9.0-r0

alpine advisories ALPINE-CVE-2026-35611

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rubygem-addressable Azure Linux 3.0 2.9.0-1

azure linux advisories AZL-82061

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-35611 updated cvss 6.5

addressable: Addressable: Denial of Service via crafted URI templates

  • Red Hat 3scale API Management Platform 2 3scale-amp21/zync, 3scale-amp22/zync, 3scale-amp21/system, 3scale-amp22/system, 3scale-amp26/toolbox, 3scale-amp2/zync-rhel8, +6 more
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
rubygems addressable
>=2.3.0, <2.9.0
2.9.0

Affected products

  • sporkmonger addressable

Classification

Weakness
  • CWE-1333 Inefficient Regular Expression Complexity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.