CVE-2026-86818Published

fast-uri vulnerable to mailto header injection via percent-encoded field-name desynchronization

cve-program · CVE-2026-86818

Published

fast-uri

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "fast-uri",
                    "product": "fast-uri",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "versionType": "semver",
                            "status": "affected",
                            "version": "4.1.3",
                            "lessThan": "4.1.5"
                        },
                        {
                            "versionType": "semver",
                            "status": "unaffected",
                            "version": "4.1.5"
                        }
                    ],
                    "packageURL": "pkg:npm/fast-uri"
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2026-78403

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Sep 15, 2026, 10:40:38 AM

dateUpdated: Sep 15, 2026, 12:31:55 PM

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2026-86818

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Awaiting Analysis

Weakness classifications: CWE-172 · CWE-436

Original publisher date fields

published: 2026-09-15T11:17:12.453

lastModified: 2026-09-16T19:40:00.317

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-jvvf-x445-j334

Published

fast-uri

npm

SEMVER · introduced 4.1.3 → fixed 4.1.5

Original source record · Cite this exact observation · Complete original publisher JSON