vulnerability / NVI-00005836 / Revision 5
league/commonmark: Denial of service via distinctly-named attributes in the Attributes extension
OSV carries this publisher advisory for league/commonmark. This is an aggregated source copy; consult the original publisher and compare update dates.
This report has not inspected your inventory, configuration, deployed build, reachability or evidence. A catalog listing and a severity score do not establish exposure or compromise.
01 / Meaning
Why it matters
Published affected context helps an owner decide what evidence to gather. This report has not examined your application.
7.5 HIGH (3.1)
disclosure@vulncheck.com severity; no combined Null risk score.
8.7 HIGH (4.0)
disclosure@vulncheck.com severity; no combined Null risk score.
0.493%
FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.42494. Missing scores are unknown.
As of · FIRST EPSS
02 / Applicability
The affected context
Affected versions, configuration prerequisites and known exclusions are public. Confirm each one against the deployed service.
league/commonmark
source listedECOSYSTEM: introduced 1.5.0; fixed 2.10.0
### Impact `AttributesExtension` ships with the library but must be explicitly registered on the `Environment`; it is not included in `CommonMarkConverter`, `GithubFlavoredMarkdownConverter`, or `GithubFlavoredMarkdownExtension`. **Applications that do not register `AttributesExtension` are not affected by this advisory.** Two paths in the extension re-process every attribute a node has already collected each time another attribute is applied to it. When the attributes carry distinct names, the collected set grows by one on every step and is walked again in full, so a run of *n* attributes costs O(n²). **1. Attribute nodes resolving to a common target (affected from 1.5.0).** `AttributesListener::processDocument()` merges each attribute node into the set accumulated for its target, then filters the result. Both operations traverse that entire set: `AttributesHelper::mergeAttributes()` rebuilds it with `array_merge()`, and `AttributesHelper::filterAttributes()` matches a regular expression against every name in it. A run of attribute nodes sharing one target therefore re-walks a set that grows by a key per node. Two input shapes reach this path: adjacent inline attributes at th
03 / Response
What to do next
- vendor patch
The original advisory lists fixed boundaries 2.10.0 for league/commonmark. Confirm the publisher’s latest guidance.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. GitHub Advisory Database via OSV
- investigate
Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.
Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system. FIRST EPSS
A fixed release is not deployment evidence.
Check current vendor support and compatibility. After making a change, verify the deployed build and relevant runtime conditions. Keep the evidence, owner and time. An updated lockfile alone does not prove what is running.
04 / Limits
What this report cannot establish
- Customer inventory, deployment, reachability and exploitation have not been inspected.
- NVD lastModified does not establish freshness of every associated CPE record.
05 / Provenance
Sources you can inspect
Each assertion retains its source. Mirrored records may repeat one underlying publisher; additional links are not independent corroboration.
- GHSA-8rr7-cvq3-gmfh ↗
GitHub Advisory Database via OSV · vendor advisory
Observed . GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.
- CVE-2026-86428 ↗
NIST National Vulnerability Database · official catalog
Observed . This product uses data from the NVD API but is not endorsed or certified by the NVD.
- CVE-2026-86428 ↗
FIRST EPSS · official catalog
Observed . FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.
Public revision history
Only published revisions appear here. Routine fetches do not create a material-change event.
- Revision 5 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 4 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 3 ·
Source facts changed; compare the preserved prior revision.
- Revision 2 ·
Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.
- Revision 1 ·
First indexed by Null; source disclosure date is shown separately.