Security fix · CVE-2026-110095
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-2026-110095. EPSS is 0.29%. 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
- 0.29%
- 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, the normalize() and serialize() functions apply RFC 3986 dot-segment removal to the path of a relative-path reference, even though that algorithm is defined only for the merged target path during resolution, so a leading parent-directory segment can be dropped and a document-relative reference can become root-relative. An application that normalizes an attacker-supplied or user-supplied relative reference and then resolves it, or uses it as a cache, deduplication, or authorization key, can have the reference escape its intended directory and point at a different resource. 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, resolve a relative reference against its absolute base first and normalize the absolute result instead of normalizing the reference beforehand.
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-2026-110095
Upgrade
CVE-2026-110095 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-2026-110095. EPSS is 0.29%. 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-41. EPSS 0.29%. 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, the normalize() and serialize() functions apply RFC 3986 dot-segment removal to the path of a relative-path reference, even though that algorithm is defined only for the merged target path during resolution, so a leading parent-directory se
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, the normalize() and serialize() functions apply RFC 3986 dot-segment removal to the path of a relative-path reference, even though that algorithm is defined only for the merged target path during resolution, so a leading parent-directory se
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, the normalize() and serialize() functions apply RFC 3986 dot-segment removal to the path of a relative-path reference, even though that algorithm is defined only for the merged target path during resolution, so a leading parent-directory se
Oct 23, 2026 · GitHub Advisory Database
Updated
### Impact 's and apply RFC 3986 dot-segment removal ( ) to the path of a relative-path reference. RFC 3986 section 5.2.4 defines that algorithm only for the merged target path during resolution, not for the reference itself, so applied to the reference it drops leading segments and can turn a document-relative reference into a root-relative one. For example, returns and returns , so points at a d
Sources
- CVE.orgVulnerability recordCVE-2026-110095
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-110095
30-day exploitation probability 0.29%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-xhq7-xmqj-769h
fast-uri vulnerable to improper path equivalence in relative reference normalization
github.com - GitLab Advisory DatabasePackage advisoryCVE-2026-110095
fast-uri's normalize() and serialize() apply RFC 3986 dot-segment removal (remove_dot_segments) to the path of a relative-path reference. RFC 3986 section 5.2.4 defines that algorithm only for the merged target path during resolution, not for the reference itself, so applied to the reference it drops leading .. segments and can turn a document-relative reference into a root-relative one. For examp
advisories.gitlab.com - NIST NVDVulnerability recordCVE-2026-110095
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, the normalize() and serialize() functions apply RFC 3986 dot-segment removal to the path of a relative-path reference, e
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