| Name | CVE-2026-18446 |
| Description | fast-uri before 4.1.2, 3.1.5, and 2.4.4 requires a literal double forward slash to recognize a URI authority, so a reference that uses a backslash based introducer in place of it (backslash backslash, forward slash backslash, or backslash forward slash) is parsed with no authority and folds into the path. Node's native WHATWG URL parser instead treats a backslash as interchangeable with a forward slash for special schemes, so the two parsers extract different hosts from the same input. Applications that use fast-uri to enforce host based policy such as allowlists, SSRF filtering, or redirect validation before passing the same URL into Node's URL or fetch consumers can be steered to an unintended host. Upgrade to fast-uri 4.1.2, 3.1.5, or 2.4.4. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| node-ajv (PTS) | bullseye | 6.12.6-2 | vulnerable |
| bookworm | 6.12.6-3 | vulnerable | |
| trixie | 8.12.0~ds+~2.1.1-5 | vulnerable | |
| forky | 8.20.0~ds+~cs6.1.3-1 | vulnerable | |
| sid | 8.20.0~ds+~cs7.1.2-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| node-ajv | source | (unstable) | (unfixed) |
[trixie] - node-ajv <no-dsa> (Minor issue)
https://github.com/fastify/fast-uri/security/advisories/GHSA-7p8r-x3mc-p8w7
Embedded fast-uri used and provided as node-fast-uri, starting with forky