CVE-2026-86432: commonmark 2.0.0 before 2.8.4 Denial of Service via XML
thephpleague · commonmark
Fixed in 2.8.4 · Affected: thephpleague commonmark before 2.8.4 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 36% of scored CVEs
DescriptionCVE.org
commonmark versions from 2.0.0 before 2.8.4 contain a denial of service vulnerability in XmlRenderer that emits depth-proportional indentation for every XML tag. Attackers can provide deeply nested Markdown or AST structures to cause quadratic memory consumption and output amplification, exhausting server resources.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- thephpleague · commonmarkfrom 2.0.0 before 2.8.4
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- thephpleague
- Published
- September 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-86432 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.