Description
A regular expression based DoS vulnerability in Active Support <6.1.7.1 and <7.0.4.1. A specially crafted string passed to the underscore method can cause the regular expression engine to enter a state of catastrophic backtracking. This can cause the process to use large amounts of CPU and memory, leading to a possible DoS vulnerability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | https://github.com/rails/rails | 6.1.7.1, 7.0.4.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | rails | 2:6.1.7.3+dfsg-1 | — |
| Debian 13 | rails | 2:6.1.7.3+dfsg-1 | — |
| Debian 12 | rails | 2:6.1.7.3+dfsg-1 | — |
| Debian 11 | rails | 2:6.0.3.7+dfsg-2+deb11u1 | DSA-5372-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | rails | No fix yet | — |
| Ubuntu 26.04 LTS | rails | No fix yet | — |
| Ubuntu 25.10 | rails | No fix yet | — |
| Ubuntu 24.04 LTS | rails | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | rails | No fix yet | — |
| Ubuntu Pro 20.04 LTS | rails | No fix yet | — |
| Ubuntu Pro 18.04 LTS | rails | No fix yet | — |
| Ubuntu Pro 16.04 LTS | rails | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Satellite Utils 6 | foreman +1 | 3.7.0.9-1.el8sat | RHSA-2023:6818 |
| Red Hat Satellite Capsule 6 | foreman +1 | 3.7.0.9-1.el8sat | RHSA-2023:6818 |
| Red Hat Satellite Capsule 6 | puppet-agent | 7.26.0-3.el8sat | RHSA-2023:6818 |
| Red Hat Satellite Capsule 6 | puppetserver | 7.11.0-1.el8sat | RHSA-2023:6818 |
| Red Hat Satellite Capsule 6 | python-django +1 | 3.2.21-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite Capsule 6 | python-future +1 | 0.18.3-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite Capsule 6 | python-gitpython +1 | 3.1.32-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite Capsule 6 | python-pulp-ansible +1 | 1:0.16.0-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite Capsule 6 | python-requests +1 | 2.31.0-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite Capsule 6 | python-sqlparse +1 | 0.4.4-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite Capsule 6 | rubygem-rack | 2.2.7-1.el8sat | RHSA-2023:6818 |
| Red Hat Satellite 6 | foreman +13 | 3.7.0.9-1.el8sat | RHSA-2023:6818 |
| Red Hat Satellite 6 | puppet-agent | 7.26.0-3.el8sat | RHSA-2023:6818 |
| Red Hat Satellite 6 | puppetserver | 7.11.0-1.el8sat | RHSA-2023:6818 |
| Red Hat Satellite 6 | python-django +1 | 3.2.21-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite 6 | python-future +1 | 0.18.3-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite 6 | python-gitpython +1 | 3.1.32-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite 6 | python-pulp-ansible +1 | 1:0.16.0-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite 6 | python-requests +1 | 2.31.0-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite 6 | python-sqlparse +1 | 0.4.4-1.el8pc | RHSA-2023:6818 |
| Red Hat Satellite 6 | rubygem-actionpack +2 | 6.1.7.3-1.el8sat | RHSA-2023:6818 |
| Red Hat Satellite 6 | rubygem-git | 1.18.0-1.el8sat | RHSA-2023:6818 |
| Red Hat Satellite 6 | rubygem-globalid | 1.1.0-1.el8sat | RHSA-2023:6818 |
| Red Hat Satellite 6 | rubygem-kubeclient | 4.10.1-1.el8sat | RHSA-2023:6818 |
| Red Hat Satellite 6 | rubygem-rack | 2.2.7-1.el8sat | RHSA-2023:6818 |
| Red Hat Satellite 6 | yggdrasil-worker-forwarder | 0.0.3-1.el8sat | RHSA-2023:6818 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | rubygem-activesupport-5_1 | 5.1.4-150000.3.12.1 | SUSE-SU-2023:0275-1 |
| SLES 15 SP3 | rubygem-activesupport-5_1 | 5.1.4-150000.3.12.1 | SUSE-SU-2023:0275-1 |
| SLES 15 SP2 | rubygem-activesupport-5_1 | 5.1.4-150000.3.12.1 | SUSE-SU-2023:0275-1 |
| SLES 15 SP1 | rubygem-activesupport-5_1 | 5.1.4-150000.3.12.1 | SUSE-SU-2023:0275-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE OpenStack Cloud Crowbar 9 | rubygem-activesupport-4_2 | 4.2.9-7.15.1 | SUSE-SU-2023:0612-1 |
| SUSE OpenStack Cloud Crowbar 8 | rubygem-activesupport-4_2 | 4.2.9-7.15.1 | SUSE-SU-2023:0612-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | rubygem-activesupport-7.0 | 7.0.4.1-1.1 | openSUSE-SU-2025:15114-1, openSUSE-SU-2024:14071-1, openSUSE-SU-2024:12767-1 |
| openSUSE Leap 15.4 | rubygem-activesupport-5_1 | 5.1.4-150000.3.12.1 | SUSE-SU-2023:0275-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | ruby-activesupport | 7.0.4.3-r0 | — |
| Alpine v3.23 | ruby-activesupport | 7.0.4.3-r0 | — |
| Alpine v3.22 | ruby-activesupport | 7.0.4.3-r0 | — |
| Alpine v3.21 | ruby-activesupport | 7.0.4.3-r0 | — |
| Alpine v3.20 | ruby-activesupport | 7.0.4.3-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | ruby-activesupport | 7.0.4.3-r0 | — |
| Alpine v3.18 | ruby-activesupport | 7.0.4.3-r0 | — |
| Alpine v3.17 | ruby-activesupport | 7.0.4.3-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| RubyGems | activesupport | < 6.1.7.1 | 6.1.7.1 | GHSA-j6gc-792m-qgm2 |
| RubyGems | activesupport | >= 7.0.0, < 7.0.4.1 | 7.0.4.1 | GHSA-j6gc-792m-qgm2 |
Advisories 9
- RHSA-2023:6818 Red Hat Security Advisory: Satellite 6.14 security and bug fix update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- DSA-5372-1 rails - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:14071-1 ruby3.3-rubygem-activesupport-7.0-7.0.8.4-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0612-1 Security update for rubygem-activesupport-4_2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12767-1 ruby3.1-rubygem-activesupport-7.0-7.0.4.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2025:15114-1 ruby3.4-rubygem-activesupport-7.0-7.0.8.6-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0275-1 Security update for rubygem-activesupport-5_1 SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-0114 Ruby on Rails: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 25, 2025
- WID-SEC-2023-2101 genua genucenter: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 20, 2023