CVE-2026-86428

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Source
https://cve.org/CVERecord?id=CVE-2026-86428
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86428.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-86428
Aliases
Downstream
Published
2026-09-07T12:53:49Z
Modified
2026-10-28T02:30:22Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
commonmark 1.5.0 before 2.10.0 Denial of Service via Attributes
Details

commonmark versions from 1.5.0 before 2.10.0 contain a denial of service vulnerability in the AttributesExtension when processing distinctly-named attributes. Attackers can submit Markdown with numerous distinct attribute names to cause quadratic-time attribute merging and filtering, consuming disproportionate CPU resources and preventing legitimate requests from completing.

Database specific 
{
    "cna_assigner":  "VulnCheck",
    "cwe_ids":  [
        "CWE-407"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86428.json"
}
References

Affected packages

Git / github.com/thephpleague/commonmark

Affected ranges

Type
GIT
Repo
https://github.com/thephpleague/commonmark
Events
Introduced
fc33ca12575e98e57cdce7d5f38b2ca5335714b3
Fixed
d2d1aa8b35e072966c89bc0c66cf926e56767dc4
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "1.5.0"
                },
                {
                    "fixed":  "2.10.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "cpe":  "cpe:2.3:a:thephpleague:commonmark:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "1.5.0"
                },
                {
                    "fixed":  "2.10.0"
                }
            ],
            "source":  "CPE_RANGE"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-86428.json"