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.
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Mon, 07 Sep 2026 13:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | commonmark 1.5.0 before 2.8.4 Denial of Service via Attributes | |
| First Time appeared |
Thephpleague
Thephpleague commonmark |
|
| Weaknesses | CWE-407 | |
| CPEs | cpe:2.3:a:thephpleague:commonmark:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Thephpleague
Thephpleague commonmark |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-09-07T12:53:52.562Z
Reserved: 2026-09-07T12:34:31.457Z
Link: CVE-2026-86433
No data.
Status : Received
Published: 2026-09-07T13:20:42.733
Modified: 2026-09-07T13:20:42.733
Link: CVE-2026-86433
No data.
OpenCVE Enrichment
Updated: 2026-09-07T15:45:17Z
Weaknesses