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No exploitation reportedFix available

CVE-2026-13676

No exploitation reported by the sources we read.

  • Published2026-06-29
  • Fixed in4.0.1 · 3.1.3 · 2.4.2
  • WeaknessCWE-436 · CWE-551

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

fast-uri versions 2.3.1 through 3.1.2 and 4.0.0 fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its original Unicode form while normalize() and equal() still return values that differ from a WHATWG-compatible URL parser. Applications that use fast-uri to enforce host-based policy (denylists, loopback filtering, redirect validation, outbound proxy routing) before passing the same URL to Node's URL or fetch can be bypassed when the two implementations resolve the same input to different hosts. Patches: upgrade to fast-uri 3.1.3 for the 3.x line or 4.0.1 for the 4.x line. Workarounds: enforce host policy using the same URL parser used for the actual request, or reject non-ASCII hosts before policy checks.

Timeline

dates in UTC
  1. 2026-06-2914:16CVE publishedNVD

Versions per branch

NVD · OSV
Openjsf fast-uri
BranchAffectedFixed in
4.0≥ 4.0.0, < 4.0.14.0.1
3.1≥ 2.3.1, < 3.1.33.1.3
3.x≥ 3.0.0, < 3.1.33.1.3
2.x≥ 2.3.1, < 2.4.22.4.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As openjs, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • fast-uriother versions: not affected
    Affected
    • ≥ 4.0.0, < 4.0.1fixed in 4.0.1semver
    • ≥ 2.3.1, < 3.1.3fixed in 3.1.3semver

    Not affected = 4.0.1 · = 3.1.3

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-06-29

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • @rootio/fast-uriRoot:npmall versions · fixed in 3.0.1-root.io.3
  • @rootio/fast-uriRoot:npmall versions · fixed in 3.0.1-root.io.4
  • @rootio/fast-uriRoot:npmall versions · fixed in 3.0.1-root.io.5
  • @rootio/fast-uriRoot:npmall versions · fixed in 3.0.1-root.io.6
  • @rootio/fast-uriRoot:npmall versions · fixed in 3.0.1-root.io.7
  • @rootio/fast-uriRoot:npmall versions · fixed in 3.0.1-root.io.8
  • @rootio/fast-uriRoot:npmall versions · fixed in 3.0.2-root.io.2
  • @rootio/fast-uriRoot:npmall versions · fixed in 3.0.2-root.io.3

145 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-13676 Red Hat Product Security390 products fixed · 39 known affected

    fast-uri: fast-uri: Security policy bypass due to improper Unicode hostname canonicalization

    openshift-sandboxed-containers/osc-pccs as a component of Confidential Compute Attestation · network-observability/network-observability-console-plugin-pf5-rhel9 as a component of Network Observability Operator · network-observability/network-observability-console-plugin-rhel9 as a component of Network Observability Operator · +36 more

  • RHSA-2026:84734 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI

  • RHSA-2026:70267 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Quay 3.14.9

  • RHSA-2026:68254 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Edge Manager Version 1.2.1 Security Update

  • RHSA-2026:68006 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Red Hat Edge Manager Version 1.2.1 Security Update

  • RHSA-2026:66545 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AMQ Broker 7.13.6 release and security update

40 more advisories

Full record on NVD

Fix

  1. Update Openjsf fast-uri to 4.0.1 · 3.1.3 · 2.4.2
  2. Vendor fix Red Hat Product Security RHSA-2026:84734 · 4 productsFor Red Hat OpenShift AI 3.4.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  3. Vendor fix Red Hat Product Security RHSA-2026:70267 · 4 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11458
  4. Vendor fix Red Hat Product Security RHSA-2026:68254 · 4 productsSee the following documentation for details on how to enable Red Hat Edge Manager and more: https://docs.redhat.com/en/documentation/red_hat_edge_manager/1.2
  5. Vendor fix Red Hat Product Security RHSA-2026:66545 · 1 productBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings. The References section of this erratum contains a download link (you must log in to download the update).
  6. Vendor fix Red Hat Product Security RHSA-2026:63371 · 1 productFor Red Hat Lightspeed in Satellite installation see the Red Hat Satellite documentation.
  7. Vendor fix Red Hat Product Security RHSA-2026:61314 · 12 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionnone2026-06-29
  • CNACVSS 3.17.5known since 2026-10-23
  • CNAweakness (CWE)CWE-436, CWE-551known since 2026-10-23
  • FIRST EPSSEPSS score0.7 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-07-21

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
2026-06-29
Last Modified
2026-09-11
NVD status
Modified
GitHub Advisory
GHSA-4c8g-83qw-93j6

Frequently asked questions

What is CVE-2026-13676?

fast-uri versions 2.3.1 through 3.1.2 and 4.0.0 fail to canonicalize Unicode (IDN) hostnames for HTTP-family URLs. The IDN conversion path calls a helper that does not exist on the global URL constructor, silently leaving the host in its original Unicode form while normalize() and equal() still return values that differ from a WHATWG-compatible URL parser. Applications that use fast-uri to enforce host-based policy (denylists, loopback filtering, redirect validation, outbound proxy routing) before passing the same URL to Node's URL or fetch can be bypassed when the two implementations resolve the same input to different hosts. Patches: upgrade to fast-uri 3.1.3 for the 3.x line or 4.0.1 for the 4.x line. Workarounds: enforce host policy using the same URL parser used for the actual request, or reject non-ASCII hosts before policy checks.

Is CVE-2026-13676 actively exploited?

Active exploitation of CVE-2026-13676 has not been confirmed. Its EPSS score was 0.7% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-13676?

CVE-2026-13676 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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