ReDoS vulnerability in parser_apache2

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 0.022, the 82nd percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 1 Nov 2021. New records show when each source confirmed them.

Sources

• GitHub Advisory Database: GHSA-hwhf-64mh-r662
• OSV: GHSA-hwhf-64mh-r662
• github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662
• nvd.nist.gov/vuln/detail/CVE-2021-41186
• github.com/fluent/fluentd/commit/5482a3d049dab351de0be68f4b4bc562319d8511
• github.com/fluent/fluentd
• github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142
• github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.md
• github.com/rubysec/ruby-advisory-db/blob/master/gems/fluentd/CVE-2021-41186.yml

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.