Security fix · CVE-2026-110725
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-2026-110725. EPSS is 0.30%. 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
- Low3.7
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.30%
- Remediation
- Version ranges on file
- Affected products
- npm fast-uri
fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions before 2.4.8, from 3.0.0 through 3.1.8, and from 4.0.0 through 4.2.2, when serialize(), normalize(), or resolve() are called with the non-default option reference set to suffix on a reference that has no authority, the emitted relative reference can contain a bare colon in its first path segment without escaping it, even though RFC 3986 forbids that because it makes the string reparse as an absolute URI with a scheme. An application that serializes or normalizes a relative reference with the suffix option and then treats the result as a URI can turn inert input into a live javascript, data, or vbscript URL, a cross-site scripting vector, and the equal() comparison can conflate a scheme-bearing reference with a relative one. Exposure is limited to applications using the non-default suffix reference option. The issue is fixed in fast-uri 2.4.8, 3.1.9, and 4.2.3, and users should upgrade to one of these versions or later. As a workaround, avoid the suffix reference option on untrusted input, or percent-encode a colon in the first path segment of the result before treating it as a URI.
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< 2.4.8
- npm fast-uri>= 3.0.0, < 3.1.9
- npm fast-uri>= 4.0.0, < 4.2.3
How to fix CVE-2026-110725
Upgrade
CVE-2026-110725 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-2026-110725. EPSS is 0.30%. 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 < 2.4.8, >= 3.0.0, < 3.1.9, >= 4.0.0, < 4.2.3. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-116; CWE-41. EPSS 0.30%. 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 before 2.4.8, from 3.0.0 through 3.1.8, and from 4.0.0 through 4.2.2, when serialize(), normalize(), or resolve() are called with the non-default option reference set to suffix on a reference that has no authority, the emitted relative reference can contain a bare colon in its first path segment without escap
Oct 20, 2026 · NIST NVD
Updated
fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions before 2.4.8, from 3.0.0 through 3.1.8, and from 4.0.0 through 4.2.2, when serialize(), normalize(), or resolve() are called with the non-default option reference set to suffix on a reference that has no authority, the emitted relative reference can contain a bare colon in its first path segment without escap
Oct 23, 2026 · GitHub Advisory Database
Updated
### Impact 's , , and , when called with the non-default option on a reference that has no authority, emit a relative reference whose first path segment contains a bare colon without escaping it. RFC 3986 section 3.3 requires the first segment of a reference not to contain a colon, precisely because a bare colon makes the string reparse as an absolute URI with a scheme. 's default serialization es
Sources
- CVE.orgVulnerability recordCVE-2026-110725
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-110725
30-day exploitation probability 0.30%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-333x-w4r6-6crp
fast-uri vulnerable to scheme injection via an unescaped first-segment colon in suffix references
github.com - GitLab Advisory DatabasePackage advisoryCVE-2026-110725
fast-uri's serialize(), normalize(), and resolve(), when called with the non-default option reference: 'suffix' on a reference that has no authority, emit a relative reference whose first path segment contains a bare colon without escaping it. RFC 3986 section 3.3 requires the first segment of a path-noscheme reference not to contain a colon, precisely because a bare colon makes the string reparse
advisories.gitlab.com - NIST NVDVulnerability recordCVE-2026-110725
fast-uri is a dependency-free RFC 3986 URI parser and serializer for Node.js. In versions before 2.4.8, from 3.0.0 through 3.1.8, and from 4.0.0 through 4.2.2, when serialize(), normalize(), or resolve() are called with the non-default option reference set to suffix on a referenc
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