REXML is an XML toolkit for Ruby. The REXML gem before 3.3.6 has a DoS vulnerability when it parses an XML that has many deep elements that have same local name attributes. If you need to parse untrusted XMLs with tree parser API like REXML::Document.new, you may be impacted to this vulnerability. If you use other parser APIs such as stream parser API and SAX2 parser API, this vulnerability is not affected. The REXML gem 3.3.6 or later include the patch to fix the vulnerability.
Weakness
The product uses XML documents and allows their structure to be defined with a Document Type Definition (DTD), but it does not properly control the number of recursive definitions of entities.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Rexml | Ruby-lang | * | 3.3.6 (excluding) |
| Red Hat Enterprise Linux 8 | RedHat | ruby:3.3-8100020240906074654.489197e6 | * |
| Red Hat Enterprise Linux 8 | RedHat | ruby:3.1-8100020250407112943.489197e6 | * |
| Red Hat Enterprise Linux 8 | RedHat | pcs-0:0.10.18-2.el8_10.2 | * |
| Red Hat Enterprise Linux 8.6 Telecommunications Update Service | RedHat | pcs-0:0.10.12-6.el8_6.6 | * |
| Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | RedHat | pcs-0:0.10.12-6.el8_6.6 | * |
| Red Hat Enterprise Linux 8.8 Extended Update Support | RedHat | pcs-0:0.10.15-4.el8_8.3 | * |
| Red Hat Enterprise Linux 9 | RedHat | ruby:3.3-9040020240906110954.9 | * |
| Red Hat Enterprise Linux 9 | RedHat | ruby:3.1-9050020250404144903.9 | * |
| Ruby2.7 | Ubuntu | esm-infra/focal | * |
| Ruby2.7 | Ubuntu | focal | * |
| Ruby3.0 | Ubuntu | jammy | * |
| Ruby3.2 | Ubuntu | noble | * |
| Ruby3.3 | Ubuntu | devel | * |
| Ruby3.3 | Ubuntu | oracular | * |
| Ruby3.3 | Ubuntu | plucky | * |
| Ruby3.3 | Ubuntu | questing | * |
| Ruby3.3 | Ubuntu | upstream | * |