Answer in brief
CVE-2024-43398 records a Medium severity (CVSS 5.9) vulnerability in REXML denial of service vulnerability. The current sources do not mark it as known exploited. The current feed maps rexml (rubygems). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps rexml (rubygems). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| rexmlrubygems | >=0 <3.3.6 | 3.3.6 |
Published upstream
Aug 22, 2024
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
### Impact 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. ### Patches The REXML gem 3.3.6 or later include the patch to fix the vulnerability. ### Workarounds Don't parse untrusted XMLs with tree parser API. ### References * https://www.ruby-lang.org/en/news/2024/08/22/dos-rexml-cve-2024-43398/ : An announce on www.ruby-lang.org
Quoted source text, attributed separately from HOL analysis.