high7.5
CVE-2026-86433
commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the Attributes extension where AttributesListener::findTargetAndDirect…
Impact
commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the Attributes extension where AttributesListener::findTargetAndDirection() performs quadratic-time sibling list scanning. Unauthenticated attackers can submit approximately 32 KB of repeated attribute blocks to cause parsing to take over 5 seconds, exhausting server resources.
Affected products
| Product | Affected versions |
|---|---|
| Commonmark Versions From 1.5.0 | before 2.8.4 |
Versions were read from the advisory text. No structured product data has been published for this record yet.