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CVE.org (no NVD analysis yet)· CNA openjs

CVE-2026-110725: fast-uri vulnerable to scheme injection via an unescaped first-segment colon in suffix references

Noroxi assessment

Priority: Monitor (action score 14/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.30% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: fast-uri fast-uri 2.4.8, 3.1.9, 4.2.3.

Low priority for now. Upgrade to fast-uri fast-uri 2.4.8, 3.1.9, 4.2.3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

LowCVSS 3.7 · v3.1—No exploit Fix available
Published
Oct 20, 2026
Updated
Oct 20, 2026
EPSS
0.3% · 23th percentile

Report tools

JSON

Action score

14

Monitor

Low priority for now.

CVSS
14 / 40 · 3.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · openjs
3.7
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (openjs). Independent of NVD's CPE analysis and usually ahead of it.

  • fast-uri fast-uri

    • 2.4.8, 3.1.9, 4.2.3not affected
    • before 2.4.8affected · semver
    • 3.0.0 and later · before 3.1.9affected · semver
    • 4.0.0 and later · before 4.2.3affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12node-ajvfrom 0—
Debian:14node-ajvbefore 8.20.0~ds+~cs7.2.4-18.20.0~ds+~cs7.2.4-1
npmfast-urifrom 3.0.0 · before 3.1.93.1.9
npmfast-urifrom 4.0.0 · before 4.2.34.2.3
npmfast-uribefore 2.4.82.4.8
openSUSE:Tumbleweedagama-web-uibefore 25+475.275dd4727-56.125+475.275dd4727-56.1
openSUSE:Tumbleweedgit-bugbefore 0.11.0-3.10.11.0-3.1

Same product

fast-uri: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-110306fast-uri vulnerable to URI scheme spoofing via percent-encoded scheme decoding
    24Monitor
  • CVE-2026-110180fast-uri vulnerable to host confusion via unchecked WHATWG host canonicalization
    19Monitor
  • CVE-2026-86818fast-uri vulnerable to mailto header injection via percent-encoded field-name desynchronization
    19Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-86472Sep 15, 2026 · fast-uri vulnerable to inconsistent host case normalization via percent-encoded octets
    19Monitor
  • ← EarlierCVE-2026-110095Oct 20, 2026 · fast-uri vulnerable to improper path equivalence in relative reference normalization
    14Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
fast-uri fast-uri2.4.8Vendor (CNA)
fast-uri fast-uri3.1.9Vendor (CNA)
fast-uri fast-uri4.2.3Vendor (CNA)
debian:node-ajv8.20.0~ds+~cs7.2.4-1 · Debian:14Package registry (OSV)
npm:fast-uri2.4.8Package registry (OSV)
npm:fast-uri3.1.9Package registry (OSV)
npm:fast-uri4.2.3Package registry (OSV)
opensuse:agama-web-ui25+475.275dd4727-56.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:git-bug0.11.0-3.1 · openSUSE:TumbleweedPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 9, 2026+20 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-1100950 days apartfast-uri vulnerable to improper path equivalence in relative reference normalization
    14Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-41 · Improper Resolution of Path Equivalence

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Exploit maturity— → none
  3. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records