REXML has DoS condition when parsing malformed XML file

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0025, the 16th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:16 UTC First seen by agentprime
2. 31 Oct 2026, 15:16 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-c2f4-jgmc-q2r5
• OSV: GHSA-c2f4-jgmc-q2r5
• github.com/ruby/rexml/security/advisories/GHSA-c2f4-jgmc-q2r5
• nvd.nist.gov/vuln/detail/CVE-2025-58767
• github.com/ruby/rexml/commit/5859bdeac792687eaf93d8e8f0b7e3c1e2ed5c23
• github.com/ruby/rexml
• github.com/rubysec/ruby-advisory-db/blob/master/gems/rexml/CVE-2025-58767.yml
• www.ruby-lang.org/en/news/2025/09/18/dos-rexml-cve-2025-58767

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.