CVE-2026-8159

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 75% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

[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.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
25.5%
KEV
Not listed

Published

May 12, 2026

Last Modified

May 13, 2026

Advisory Details (3)

Auto-updated May 12, 2026
Patch available. Sources: github.
generic

Regular expression Denial of Service - ReDoS | OWASP Foundation

https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS
github Patch Available

multiparty vulnerable to ReDoS via filename parsing · Advisory · pillarjs/multiparty · GitHub

https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html

Vendor Advisories for CVE-2026-8159(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
multiparty—4.3.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:27 UTCEPSS rescore
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  1. 2026-06-24 14:05 UTCEPSS rescore
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  22. 2026-06-12 13:49 UTCEG score recompute
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Frequently asked(5)

What is CVE-2026-8159?
CVE-2026-8159 is a high vulnerability published on May 12, 2026. [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…
When was CVE-2026-8159 disclosed?
CVE-2026-8159 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8159 actively exploited?
CVE-2026-8159 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 25.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8159?
CVE-2026-8159 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-8159?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8159, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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