PatchTheCVECVE-2026-75931: fast-uri is a URI parser for Node.js
CVE-2026-75931 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 is a URI parser for Node.js. It canonicalizes a host to its ASCII form only when the input carries an explicit scheme, so a scheme-relative reference such as a host preceded by two slashes is returned with its host verbatim and no error set. As a result fast-uri's own entry points disagree with each other: parse, resolve, normalize, and equal can yield different hosts for the same input depending only on whether a scheme is written out,
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 | 0.4% (top 66%) |
| CISA exploited list | No |
| Weakness | CWE-436 |
| Published | 2026-08-24 |
| Last modified | 2026-10-14 |
Last updated 2026-10-14 · 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
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-2026-75931?
fast-uri: upgrade to 2.4.5, 3.1.6, 4.1.3. Exact commands for each OS are on this page.
Is CVE-2026-75931 being exploited?
CVE-2026-75931 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-2026-75931 affect?
CVE-2026-75931 affects fast-uri. Severity is high (CVSS 7.5). fast-uri is a URI parser for Node.js. It canonicalizes a host to its ASCII form only when the input carries an explicit scheme, so a scheme-relative reference such as a host preceded by two slashes is returned with its host verbatim and no
How urgent is CVE-2026-75931?
Priority 40/100. High severity; Remotely exploitable, no login, no user action
Software pages
Related CVEs
- 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-2026-84292 HIGH 7.5 UPGRADE fast-uri serializes the port component of a URI without validating it
- CVE-2026-84394 HIGH 7.5 DOWNGRADE fast-uri accepts a host that contains an unbalanced or misplaced authority bracket without reporting an error