No advisories yet.
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Tue, 15 Sep 2026 13:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Tue, 15 Sep 2026 12:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Fast-uri
Fast-uri fast-uri |
|
| Vendors & Products |
Fast-uri
Fast-uri fast-uri |
Tue, 15 Sep 2026 10:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv, that added a mailto scheme parser in version 4.1.3. In versions 4.1.3 and 4.1.4, the mailto parser compares each query field name to the reserved names to, subject, and body while the name is still percent-encoded, and decodes it only when storing it as a generic header, so a percent-encoded spelling of a reserved field name is not recognized as that field at parse time but is re-emitted as the literal field name when the parsed URI is serialized. An application that validates, logs, or displays the recipient list from the first parse and then serializes the URI and sends it can silently gain an attacker-chosen recipient, and the subject and body fields can be smuggled across the same roundtrip. The issue is fixed in fast-uri 4.1.5, and users should upgrade to 4.1.5 or later. As a workaround, do not act on a mailto URI that fast-uri has re-serialized without first decoding and re-validating its recipient, subject, and body fields. | |
| Title | fast-uri vulnerable to mailto header injection via percent-encoded field-name desynchronization | |
| Weaknesses | CWE-172 CWE-436 |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
Sign in to view the affected projects.
Status: PUBLISHED
Assigner: openjs
Published:
Updated: 2026-09-15T12:31:55.631Z
Reserved: 2026-09-08T13:53:37.286Z
Link: CVE-2026-86818
Updated: 2026-09-15T12:31:45.415Z
Status : Received
Published: 2026-09-15T11:17:12.453
Modified: 2026-09-15T13:16:44.010
Link: CVE-2026-86818
No data.
OpenCVE Enrichment
Updated: 2026-09-15T11:45:17Z