Security fix · CVE-2026-110180
fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js.
Published Oct 20, 2026 · catalog updated Oct 23, 2026 · fast-uri is a dependency-free
Last checked Nov 6, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-110180. EPSS is 0.26%. Act only if a listed version of fast-uri is a dependency-free is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (fast-uri is a dependency-free).
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Medium4.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.26%
- Remediation
- Version ranges on file
- Affected products
- npm fast-uri
### Impact versions , , and can silently rewrite the host of an HTTP-family URL ( , , , , or any scheme with ). For those schemes passes the parsed host to the WHATWG parser and adopts its without checking that the parser read the whole input as a host. RFC 3986 permits inside the host group and the WHATWG parser strips TAB, LF, and CR, so the authority reports is rewritten by that second parser with no set: data before an is dropped and whitespace is removed. For example, parses to host (dropping the segment), and a host containing a raw TAB, CR, or LF has those characters stripped. then treats a whitespace-smuggled host as the same as the clean one, and rewrites the authority the same way. Applications that use to enforce host-based policy (denylists, loopback filtering, redirect validation, outbound proxy routing) on one representation, such as the raw input, see a policy/use desync: the canonical host returns differs from what was checked, and traffic can be steered to an unintended destination. ### Patches Upgrade to , , or . ### Workarounds Reject URIs whose authority contains more than one , or contains TAB, CR, or LF, before calling . Alternatively, treat any non-empty as fatal, and compare hosts only from the same result.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- npm fast-uri>= 2.4.2, < 2.4.8
- npm fast-uri>= 3.1.3, < 3.1.9
- npm fast-uri>= 4.0.1, < 4.2.3
How to fix CVE-2026-110180
Upgrade
CVE-2026-110180 lists a fix boundary at 2.4.8. Compare the installed build with that boundary before you change production.
Version check
Affected < 2.4.8
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-110180. EPSS is 0.26%. Act only if a listed version of fast-uri is a dependency-free is installed.
Which versions are affected?
Compare what you have installed with >= 2.4.2, < 2.4.8, >= 3.1.3, < 3.1.9, >= 4.0.1, < 4.2.3. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-20: Improper Input Validation; CWE-436. EPSS 0.26%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Oct 20, 2026 · NIST NVD
Detected
fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions from 2.4.2 through 2.4.7, from 3.1.3 through 3.1.8, and from 4.0.1 through 4.2.2, for HTTP-family schemes the canonicalizeHost() function passes the parsed host to the WHATWG URL parser and adopts its hostname without checking that the parser consumed the entire input as a host, so the authority can be silent
Oct 20, 2026 · NIST NVD
Updated
fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions from 2.4.2 through 2.4.7, from 3.1.3 through 3.1.8, and from 4.0.1 through 4.2.2, for HTTP-family schemes the canonicalizeHost() function passes the parsed host to the WHATWG URL parser and adopts its hostname without checking that the parser consumed the entire input as a host, so the authority can be silent
Oct 20, 2026 · NIST NVD
Updated
fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions from 2.4.2 through 2.4.7, from 3.1.3 through 3.1.8, and from 4.0.1 through 4.2.2, for HTTP-family schemes the canonicalizeHost() function passes the parsed host to the WHATWG URL parser and adopts its hostname without checking that the parser consumed the entire input as a host, so the authority can be silent
Oct 23, 2026 · GitHub Advisory Database
Updated
### Impact versions , , and can silently rewrite the host of an HTTP-family URL ( , , , , or any scheme with ). For those schemes passes the parsed host to the WHATWG parser and adopts its without checking that the parser read the whole input as a host. RFC 3986 permits inside the host group and the WHATWG parser strips TAB, LF, and CR, so the authority reports is rewritten by that second parser w
Sources
- CVE.orgVulnerability recordCVE-2026-110180
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-110180
30-day exploitation probability 0.26%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-wjr9-j795-jxcr
fast-uri vulnerable to host confusion via unchecked WHATWG host canonicalization
github.com - GitLab Advisory DatabasePackage advisoryCVE-2026-110180
fast-uri versions >= 2.4.2, = 3.1.3, = 4.0.1, <= 4.2.2 can silently rewrite the host of an HTTP-family URL (http, https, ws, wss, or any scheme with domainHost: true). For those schemes canonicalizeHost() passes the parsed host to the WHATWG URL parser and adopts its .hostname without checking that the parser read the whole input as a host. RFC 3986 permits @ inside the host …
advisories.gitlab.com - NIST NVDVulnerability recordCVE-2026-110180
fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions from 2.4.2 through 2.4.7, from 3.1.3 through 3.1.8, and from 4.0.1 through 4.2.2, for HTTP-family schemes the canonicalizeHost() function passes the parsed host to the WHATWG URL parser and
nvd.nist.gov
References
Freshness
Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 6, 2026
- GitLab Advisory DatabaseOct 27, 2026
- GitHub Advisory DatabaseOct 24, 2026
- CVE.orgOct 21, 2026
- NIST NVDOct 21, 2026