CVE-2026-8159
7.5 · HIGHOverview
CVE-2026-8159 is a high-severity vulnerability affecting pillarjs multiparty. It was published on May 12, 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
[email protected] and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. Upgrade to [email protected] or higher.
Remediation
Check the references section for vendor advisories and patches from pillarjs. Update multiparty 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 |
|---|---|---|---|
| pillarjs | multiparty | >= 0, < 4.3.0 | Affected |
Frequently Asked Questions
What is CVE-2026-8159?
CVE-2026-8159 is a high-severity vulnerability affecting pillarjs multiparty. It was published on May 12, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-8159?
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-2026-8159?
Check the references section for vendor advisories and patches from pillarjs. Update multiparty 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-2026-8159?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-8159 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
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