CVE-2026-59887
7.5 · HIGHOverview
CVE-2026-59887 is a high-severity vulnerability affecting markdown-it linkify-it. It was published on July 8, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in lib/re.mjs, causing O(n^2) CPU consumption on crafted user text. This issue is fixed in version 5.0.2.
Remediation
Check the references section for vendor advisories and patches from markdown-it. Update linkify-it to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| markdown-it | linkify-it | >= 0, < 5.0.2 | Affected |
References
Frequently Asked Questions
What is CVE-2026-59887?
CVE-2026-59887 is a high-severity vulnerability affecting markdown-it linkify-it. It was published on July 8, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-59887?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-59887?
Check the references section for vendor advisories and patches from markdown-it. Update linkify-it to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-59887?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-59887 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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