fast-uri vulnerable to authority injection via an unvalidated port in serialize

[ Description ]Official description

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 error, so re-validating the built URI does not catch it. This affects applications that build URIs from parts and assign untrusted data to the port component through the serialize, normalize, or equal functions in their object forms. The issue affects fast-uri versions before 2.4.6, from 3.0.0 before 3.1.7, and from 4.0.0 before 4.1.4. It is fixed in 2.4.6, 3.1.7, and 4.1.4, where recomposeAuthority rejects any port that is not a digit sequence per RFC 3986.

[ Fixes ]Fixes and patches

• fast-uri 2.4.6Fixed version · GitHub Advisories · npm package fast-uri: upgrade to 2.4.6 or later (affected < 2.4.6)
• fast-uri 3.1.7Fixed version · GitHub Advisories · npm package fast-uri: upgrade to 3.1.7 or later (affected >= 3.0.0, < 3.1.7)
• fast-uri 4.1.4Fixed version · GitHub Advisories · npm package fast-uri: upgrade to 4.1.4 or later (affected >= 4.0.0, < 4.1.4)

[ Advisories ]Government CERT advisories

• BSI CERT-Bund20 Oct 2026WID-SEC-2026-4056

  Atlassian products (Bamboo, Bitbucket, Confluence, Crucible, Fisheye and Jira): Multiple vulnerabilities Translated from German

  CVE-2026-13676CVE-2026-50750CVE-2026-53404+72 more CVEs
• CERT-FR16 Oct 2026CERTFR-2026-AVI-1336

  Multiple vulnerabilities in IBM products Translated from French

  Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-14671CVE-2026-11548CVE-2022-22950+490 more CVEs
• CERT-FR9 Oct 2026CERTFR-2026-AVI-1291

  Multiple vulnerabilities in IBM products Translated from French

  Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-49978CVE-2025-27895CVE-2026-59651+195 more CVEs
• CERT-FR2 Oct 2026CERTFR-2026-AVI-1256

  Multiple vulnerabilities in IBM products Translated from French

  Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-27980CVE-2026-58055CVE-2026-49978+360 more CVEs
• BSI CERT-Bund27 Sep 2026WID-SEC-2026-3596

  IBM App Connect Enterprise: Multiple vulnerabilities Translated from German

  CVE-2026-83610CVE-2026-13149CVE-2026-69152+49 more CVEs
• CERT-FR25 Sep 2026CERTFR-2026-AVI-1233

  Multiple vulnerabilities in IBM products Translated from French

  Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, remote denial of service and a breach of data confidentiality.

  CVE-2021-44906CVE-2026-59651CVE-2026-6402+183 more CVEs
• BSI CERT-Bund23 Sep 2026WID-SEC-2026-3555

  Red Hat Ansible Automation Platform (automation-controller): Multiple vulnerabilities Translated from German

  CVE-2026-84713CVE-2026-71459CVE-2026-84475+58 more CVEs

[ Packages ]Affected open-source packages

• fast-uri npmAffected < 2.4.6 · fixed in 2.4.6 · GHSA-qw65-cvwx-89v3
• fast-uri npmAffected >= 3.0.0, < 3.1.7 · fixed in 3.1.7 · GHSA-qw65-cvwx-89v3
• fast-uri npmAffected >= 4.0.0, < 4.1.4 · fixed in 4.1.4 · GHSA-qw65-cvwx-89v3

[ References ]References

• github.com/fastify/fast-uri/security/advisories/GHSA-qw65-cvwx-89v3
• cna.openjsf.org/security-advisories.html