PatchTheCVECVE-2026-84292: fast-uri serializes the port component of a URI without validating it
CVE-2026-84292 is a high-severity flaw (CVSS 7.5) affecting fast-uri. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
fast-uri serializes the port component of a URI without validating it. When recomposing the authority, the userinfo and host components are escaped but the port is concatenated verbatim, so a port value that is not a sequence of digits can inject authority delimiters, demoting the intended host to userinfo and pointing the authority at an attacker-controlled host. Both fast-uri and Node's URL read the result back as the attacker's host with no er
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.2% (top 85%) |
| CISA exploited list | No |
| Weakness | CWE-116 |
| Published | 2026-09-02 |
| Last modified | 2026-10-06 |
Last updated 2026-10-06 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Research and news
- Vulners Bulletins: Security Bulletin: IBM InfoSphere Optim Archive Viewer is affected by a vulnerability in fast-uri (CVE-2026-84292) 2026-10-27
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-84292?
fast-uri: upgrade to 2.4.6, 3.1.7, 4.1.4. Exact commands for each OS are on this page.
Is CVE-2026-84292 being exploited?
CVE-2026-84292 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-84292 affect?
CVE-2026-84292 affects fast-uri. Severity is high (CVSS 7.5). fast-uri serializes the port component of a URI without validating it. When recomposing the authority, the userinfo and host components are escaped but the port is concatenated verbatim, so a port value that is not a sequence of digits can
How urgent is CVE-2026-84292?
Priority 35/100. High severity; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2026-75931 HIGH 7.5 UPGRADE fast-uri is a URI parser for Node.js
- CVE-2026-76172 HIGH 7.5 UPGRADE fast-uri is a URI parser for Node.js
- CVE-2026-75899 HIGH 7.5 UPGRADE fast-uri is a URI parser for Node.js
- CVE-2026-75975 HIGH 7.5 UPGRADE fast-uri is a URI parser for Node.js
- CVE-2026-84394 HIGH 7.5 DOWNGRADE fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error