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fast-uri vulnerable to host confusion via backslash authority introducer

Exploitation and risk

Source status

CISA KEV lists vulnerabilities known to be exploited. FIRST EPSS estimates the likelihood of exploitation in the next 30 days. An unavailable score does not mean zero risk.

Which CVEs have scores here?

This view includes predictions for CVE identifiers explicitly listed in public NuGet advisories. Microsoft release pages have their own prediction coverage. Check source status for the scope and latest checks.

No exploitation or prediction data is available here for these CVEs. This does not mean they are safe or unlikely to be exploited.

cve-program · CVE-2026-18446

Published

fast-uri before 4.1.2, 3.1.5, and 2.4.4 requires a literal double forward slash to recognize a URI authority, so a reference that uses a backslash based introducer in place of it (backslash backslash, forward slash backslash, or backslash forward slash) is parsed with no authority and folds into the path. Node's native WHATWG URL parser instead treats a backslash as interchangeable with a forward slash for special schemes, so the two parsers extract different hosts from the same input. Applications that use fast-uri to enforce host based policy such as allowlists, SSRF filtering, or redirect validation before passing the same URL into Node's URL or fetch consumers can be steered to an unintended host. Upgrade to fast-uri 4.1.2, 3.1.5, or 2.4.4.

Source published
31 Jul 2026 14:37:01 UTC
Source modified
31 Jul 2026 17:47:35 UTC
Saved here
23 Oct 2026 15:48:27 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

euvd · EUVD-2026-51553

Published

fast-uri before 4.1.2, 3.1.5, and 2.4.4 requires a literal double forward slash to recognize a URI authority, so a reference that uses a backslash based introducer in place of it (backslash backslash, forward slash backslash, or backslash forward slash) is parsed with no authority and folds into the path. Node's native WHATWG URL parser instead treats a backslash as interchangeable with a forward slash for special schemes, so the two parsers extract different hosts from the same input. Applications that use fast-uri to enforce host based policy such as allowlists, SSRF filtering, or redirect validation before passing the same URL into Node's URL or fetch consumers can be steered to an unintended host. Upgrade to fast-uri 4.1.2, 3.1.5, or 2.4.4.

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jul 31, 2026, 2:37:01 PM

dateUpdated: Jul 31, 2026, 5:47:35 PM

11 related source bulletins · separate from aliases

RHSA-2026:87410: Red Hat Security Advisory: RHOAI 2.25.12 - Red Hat OpenShift AI

CVE-2024-12224 · CVE-2025-14920 · CVE-2025-14921 · CVE-2025-14924 · CVE-2025-14925 · CVE-2025-14926 · CVE-2025-14927 · CVE-2025-14928 · CVE-2025-14929 · CVE-2025-14930 · CVE-2025-61726 · CVE-2025-61729 · CVE-2026-5241 · CVE-2026-5497 · CVE-2026-6734 · CVE-2026-8643 · CVE-2026-9697 · CVE-2026-11822 · CVE-2026-11824 · CVE-2026-12151 · CVE-2026-12860 · CVE-2026-15143 · CVE-2026-15574 · CVE-2026-15679 · CVE-2026-15925 · CVE-2026-16221 · CVE-2026-18427 · CVE-2026-18446 · CVE-2026-18949 · CVE-2026-19481 · CVE-2026-19484 · CVE-2026-19534 · CVE-2026-25681 · CVE-2026-25960 · CVE-2026-27136 · CVE-2026-28390 · CVE-2026-28684 · CVE-2026-31812 · CVE-2026-32283 · CVE-2026-33186 · CVE-2026-33805 · CVE-2026-33811 · CVE-2026-33814 · CVE-2026-34993 · CVE-2026-39821 · CVE-2026-39852 · CVE-2026-39892 · CVE-2026-40682 · CVE-2026-41178 · CVE-2026-42502 · CVE-2026-42561 · CVE-2026-44431 · CVE-2026-44432 · CVE-2026-44660 · CVE-2026-44705 · CVE-2026-45820 · CVE-2026-47219 · CVE-2026-48526 · CVE-2026-48710 · CVE-2026-48746 · CVE-2026-49114 · CVE-2026-49825 · CVE-2026-49855 · CVE-2026-50559 · CVE-2026-54283 · CVE-2026-54399 · CVE-2026-54428 · CVE-2026-55831 · CVE-2026-55833 · CVE-2026-56121 · CVE-2026-56746 · CVE-2026-56819 · CVE-2026-56853 · CVE-2026-56858 · CVE-2026-56859 · CVE-2026-56860 · CVE-2026-56862 · CVE-2026-58059 · CVE-2026-59296 · CVE-2026-59879 · CVE-2026-59884 · CVE-2026-59885 · CVE-2026-59886 · CVE-2026-59899 · CVE-2026-62243 · CVE-2026-62384 · CVE-2026-63209 · CVE-2026-63374 · CVE-2026-65898 · CVE-2026-65918 · CVE-2026-66007 · CVE-2026-67213 · CVE-2026-67214 · CVE-2026-67312 · CVE-2026-68494 · CVE-2026-68497 · CVE-2026-68770 · CVE-2026-69097 · CVE-2026-69112 · CVE-2026-69152 · CVE-2026-69153 · CVE-2026-69243 · CVE-2026-69244 · CVE-2026-71281 · CVE-2026-73086 · CVE-2026-73088 · CVE-2026-73089 · CVE-2026-73415 · CVE-2026-73417 · CVE-2026-73502 · CVE-2026-73508 · CVE-2026-73620 · CVE-2026-73622 · CVE-2026-73623 · CVE-2026-73624 · CVE-2026-73625 · CVE-2026-73627 · CVE-2026-73646 · CVE-2026-75838 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-75975 · CVE-2026-76098 · CVE-2026-76169 · CVE-2026-76172 · CVE-2026-76222 · CVE-2026-76905 · CVE-2026-77354 · CVE-2026-77874 · CVE-2026-78676 · CVE-2026-78677 · CVE-2026-78679 · CVE-2026-78682 · CVE-2026-79674 · CVE-2026-79675 · CVE-2026-80205 · CVE-2026-81722 · CVE-2026-81724 · CVE-2026-81727 · CVE-2026-82397 · CVE-2026-82417 · CVE-2026-84292 · CVE-2026-84375 · CVE-2026-84394 · CVE-2026-84428 · CVE-2026-84445 · CVE-2026-84469 · CVE-2026-84504 · CVE-2026-84782 · CVE-2026-84961 · CVE-2026-85124 · CVE-2026-85152 · CVE-2026-85525 · CVE-2026-86049 · CVE-2026-86332 · CVE-2026-87776 · CVE-2026-87817 · CVE-2026-87819 · CVE-2026-88029 · CVE-2026-88031 · CVE-2026-89418 · CVE-2026-89425 · CVE-2026-91777 · CVE-2026-91990 · CVE-2026-92599 · CVE-2026-93599 · CVE-2026-93657 · CVE-2026-93749 · CVE-2026-96749 · CVE-2026-102831 · CVE-2026-102925 · CVE-2026-102930 · CVE-2026-102937 · CVE-2026-102938 · CVE-2026-103262 · CVE-2026-104851 · CVE-2026-105744

RHSA-2026:62550: Red Hat Security Advisory: OpenShift Container Platform 4.16.70 bug fix and security update

CVE-2026-18446 · CVE-2026-25681 · CVE-2026-33814 · CVE-2026-34986 · CVE-2026-54423

WID-SEC-W-2026-2923: Atlassian Produkte (Bamboo, Bitbucket, Confluence, Crucible, Fisheye, und Jira): Mehrere Schwachstellen

CVE-2019-13990 · CVE-2021-44906 · CVE-2022-1471 · CVE-2022-23521 · CVE-2022-3517 · CVE-2022-41903 · CVE-2023-22518 · CVE-2023-22522 · CVE-2023-22523 · CVE-2023-22524 · CVE-2023-22527 · CVE-2023-45133 · CVE-2023-46604 · CVE-2025-14813 · CVE-2026-0603 · CVE-2026-10050 · CVE-2026-12143 · CVE-2026-12151 · CVE-2026-12802 · CVE-2026-12803 · CVE-2026-12816 · CVE-2026-13149 · CVE-2026-13506 · CVE-2026-13676 · CVE-2026-14257 · CVE-2026-14682 · CVE-2026-16221 · CVE-2026-18446 · CVE-2026-21582 · CVE-2026-2332 · CVE-2026-24734 · CVE-2026-25639 · CVE-2026-27601 · CVE-2026-27606 · CVE-2026-29786 · CVE-2026-3505 · CVE-2026-40983 · CVE-2026-40984 · CVE-2026-41284 · CVE-2026-41842 · CVE-2026-41845 · CVE-2026-41850 · CVE-2026-41851 · CVE-2026-41907 · CVE-2026-42033 · CVE-2026-42035 · CVE-2026-42041 · CVE-2026-42198 · CVE-2026-42583 · CVE-2026-42587 · CVE-2026-43513 · CVE-2026-44249 · CVE-2026-44486 · CVE-2026-44487 · CVE-2026-44488 · CVE-2026-44490 · CVE-2026-44492 · CVE-2026-44494 · CVE-2026-44495 · CVE-2026-44496 · CVE-2026-45416 · CVE-2026-45623 · CVE-2026-46625 · CVE-2026-47838 · CVE-2026-4800 · CVE-2026-48043 · CVE-2026-48779 · CVE-2026-48801 · CVE-2026-50010 · CVE-2026-53434 · CVE-2026-54291 · CVE-2026-54512 · CVE-2026-54513 · CVE-2026-55685 · CVE-2026-55831 · CVE-2026-55833 · CVE-2026-56745 · CVE-2026-56819 · CVE-2026-58059 · CVE-2026-58060 · CVE-2026-59639 · CVE-2026-59642 · CVE-2026-59869 · CVE-2026-59871 · CVE-2026-59873 · CVE-2026-59874 · CVE-2026-59887 · CVE-2026-59901 · CVE-2026-6321 · CVE-2026-6322 · CVE-2026-67320 · CVE-2026-69152 · CVE-2026-69192

RHSA-2026:92510: Red Hat Security Advisory: RHOAI 3.4.6 - Red Hat OpenShift AI

CVE-2023-54404 · CVE-2026-11822 · CVE-2026-11824 · CVE-2026-13717 · CVE-2026-16221 · CVE-2026-17106 · CVE-2026-18446 · CVE-2026-25681 · CVE-2026-26007 · CVE-2026-27136 · CVE-2026-33814 · CVE-2026-33818 · CVE-2026-39821 · CVE-2026-39834 · CVE-2026-41178 · CVE-2026-42502 · CVE-2026-45819 · CVE-2026-45820 · CVE-2026-56853 · CVE-2026-56858 · CVE-2026-56859 · CVE-2026-56860 · CVE-2026-56862 · CVE-2026-57516 · CVE-2026-59951 · CVE-2026-63209 · CVE-2026-63374 · CVE-2026-65898 · CVE-2026-67312 · CVE-2026-67314 · CVE-2026-67320 · CVE-2026-67321 · CVE-2026-69097 · CVE-2026-69153 · CVE-2026-73086 · CVE-2026-73088 · CVE-2026-73089 · CVE-2026-73643 · CVE-2026-75838 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-75975 · CVE-2026-76172 · CVE-2026-76844 · CVE-2026-77301 · CVE-2026-78679 · CVE-2026-82397 · CVE-2026-83663 · CVE-2026-84375 · CVE-2026-84445 · CVE-2026-85393 · CVE-2026-85525 · CVE-2026-87018 · CVE-2026-90711 · CVE-2026-91990 · CVE-2026-92599 · CVE-2026-93690 · CVE-2026-93749 · CVE-2026-94637 · CVE-2026-96640 · CVE-2026-96643 · CVE-2026-96644 · CVE-2026-96778 · CVE-2026-96804 · CVE-2026-97687 · CVE-2026-97689 · CVE-2026-102267 · CVE-2026-102271 · CVE-2026-102272 · CVE-2026-102276 · CVE-2026-102278 · CVE-2026-102282 · CVE-2026-104150 · CVE-2026-104851 · CVE-2026-105922 · CVE-2026-106445 · CVE-2026-106446 · CVE-2026-109156 · CVE-2026-109383 · CVE-2026-109527 · CVE-2026-109829 · CVE-2026-109869 · CVE-2026-109956 · CVE-2026-110856 · CVE-2026-110857 · CVE-2026-110858 · CVE-2026-110859 · CVE-2026-111064 · CVE-2026-111066 · CVE-2026-111497 · CVE-2026-112390 · CVE-2026-112391 · CVE-2026-112392 · CVE-2026-112397 · CVE-2026-112399 · CVE-2026-112400 · CVE-2026-112402 · CVE-2026-112404 · CVE-2026-112405 · CVE-2026-112893 · CVE-2026-112894 · CVE-2026-112895 · CVE-2026-112896 · CVE-2026-112897 · CVE-2026-112940 · CVE-2026-114145

RHSA-2026:68553: Red Hat Security Advisory: OpenShift Container Platform 4.22.15 security and extras update

CVE-2026-16221 · CVE-2026-18446 · CVE-2026-33814 · CVE-2026-45819 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-75975 · CVE-2026-76172 · CVE-2026-84292 · CVE-2026-84394

RHSA-2026:71454: Red Hat Security Advisory: OpenShift Container Platform 4.22.16 bug fix and security update

CVE-2026-18446 · CVE-2026-27136 · CVE-2026-33814 · CVE-2026-41178 · CVE-2026-45819 · CVE-2026-46597 · CVE-2026-75885 · CVE-2026-75886 · CVE-2026-75887

RHSA-2026:49401: Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

CVE-2026-18446 · CVE-2026-67319 · CVE-2026-69198

RHSA-2026:49387: Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

CVE-2026-18446 · CVE-2026-67319

RHSA-2026:68547: Red Hat Security Advisory: OpenShift Container Platform 4.21.34 security and extras update

CVE-2026-16221 · CVE-2026-18446 · CVE-2026-33814 · CVE-2026-45819 · CVE-2026-75899 · CVE-2026-75931 · CVE-2026-75975 · CVE-2026-76172 · CVE-2026-84292 · CVE-2026-84394

NCSC-2026-0325: Kwetsbaarheden verholpen in Atlassian producten

CVE-2021-44906 · CVE-2022-3517 · CVE-2023-45133 · CVE-2025-14813 · CVE-2026-0603 · CVE-2026-2332 · CVE-2026-3505 · CVE-2026-4800 · CVE-2026-6321 · CVE-2026-6322 · CVE-2026-10050 · CVE-2026-12143 · CVE-2026-12151 · CVE-2026-12802 · CVE-2026-12803 · CVE-2026-12816 · CVE-2026-13149 · CVE-2026-13506 · CVE-2026-13676 · CVE-2026-14257 · CVE-2026-14682 · CVE-2026-16221 · CVE-2026-18446 · CVE-2026-21582 · CVE-2026-24734 · CVE-2026-25639 · CVE-2026-27601 · CVE-2026-27606 · CVE-2026-29786 · CVE-2026-40983 · CVE-2026-40984 · CVE-2026-41284 · CVE-2026-41842 · CVE-2026-41845 · CVE-2026-41850 · CVE-2026-41851 · CVE-2026-41907 · CVE-2026-42033 · CVE-2026-42035 · CVE-2026-42041 · CVE-2026-42198 · CVE-2026-42583 · CVE-2026-42587 · CVE-2026-43513 · CVE-2026-44249 · CVE-2026-44486 · CVE-2026-44487 · CVE-2026-44488 · CVE-2026-44490 · CVE-2026-44492 · CVE-2026-44494 · CVE-2026-44495 · CVE-2026-44496 · CVE-2026-45416 · CVE-2026-45623 · CVE-2026-46625 · CVE-2026-47838 · CVE-2026-48043 · CVE-2026-48779 · CVE-2026-48801 · CVE-2026-50010 · CVE-2026-53434 · CVE-2026-54291 · CVE-2026-54512 · CVE-2026-54513 · CVE-2026-55685 · CVE-2026-55831 · CVE-2026-55833 · CVE-2026-56745 · CVE-2026-56819 · CVE-2026-58059 · CVE-2026-58060 · CVE-2026-59639 · CVE-2026-59642 · CVE-2026-59869 · CVE-2026-59871 · CVE-2026-59873 · CVE-2026-59874 · CVE-2026-59887 · CVE-2026-59901 · CVE-2026-67320 · CVE-2026-69152 · CVE-2026-69192

WID-SEC-W-2026-3376: Atlassian Bamboo, Bitbucket, Confluence, Fisheye/Crucible, Jira Software und Jira Service Management: Mehrere Schwachstellen

CVE-2022-46175 · CVE-2026-12143 · CVE-2026-12802 · CVE-2026-12803 · CVE-2026-12816 · CVE-2026-13506 · CVE-2026-13676 · CVE-2026-14257 · CVE-2026-14682 · CVE-2026-16221 · CVE-2026-18446 · CVE-2026-21582 · CVE-2026-42583 · CVE-2026-44249 · CVE-2026-44728 · CVE-2026-45416 · CVE-2026-45623 · CVE-2026-45674 · CVE-2026-47691 · CVE-2026-47759 · CVE-2026-47761 · CVE-2026-47762 · CVE-2026-4800 · CVE-2026-48043 · CVE-2026-48801 · CVE-2026-50010 · CVE-2026-53404 · CVE-2026-53434 · CVE-2026-54428 · CVE-2026-54512 · CVE-2026-54513 · CVE-2026-55153 · CVE-2026-55276 · CVE-2026-55831 · CVE-2026-55833 · CVE-2026-56745 · CVE-2026-56819 · CVE-2026-58059 · CVE-2026-58060 · CVE-2026-59639 · CVE-2026-59642 · CVE-2026-59650 · CVE-2026-59869 · CVE-2026-59879 · CVE-2026-59880 · CVE-2026-59887 · CVE-2026-59901 · CVE-2026-67213 · CVE-2026-67214 · CVE-2026-67320 · CVE-2026-68763 · CVE-2026-69152 · CVE-2026-73086 · CVE-2026-73088 · CVE-2026-73089 · CVE-2026-73507 · CVE-2026-73566 · CVE-2026-73646 · CVE-2026-75140 · CVE-2026-75595 · CVE-2026-75899 · CVE-2026-75975 · CVE-2026-76172 · CVE-2026-8763

Source published
Jul 31, 2026, 2:37:01 PM (timezone not stated)
Source modified
Jul 31, 2026, 5:47:35 PM (timezone not stated)
Saved here
15 Nov 2026 07:33:14 UTC
Source terms
ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

Source: euvd · ENISA EUVD · source terms and attribution apply. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

EUVD CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

nvd · CVE-2026-18446

Published

fast-uri before 4.1.2, 3.1.5, and 2.4.4 requires a literal double forward slash to recognize a URI authority, so a reference that uses a backslash based introducer in place of it (backslash backslash, forward slash backslash, or backslash forward slash) is parsed with no authority and folds into the path. Node's native WHATWG URL parser instead treats a backslash as interchangeable with a forward slash for special schemes, so the two parsers extract different hosts from the same input. Applications that use fast-uri to enforce host based policy such as allowlists, SSRF filtering, or redirect validation before passing the same URL into Node's URL or fetch consumers can be steered to an unintended host. Upgrade to fast-uri 4.1.2, 3.1.5, or 2.4.4.

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-436

Original publisher date fields

published: 2026-07-31T15:16:27.983

lastModified: 2026-09-02T14:42:38.677

1 source CPE criteria · context only
  • cpe:2.3:a:openjsf:fast-uri:*:*:*:*:*:node.js:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published
31 Jul 2026 15:16:27 UTC
Source modified
2 Sep 2026 14:42:38 UTC
Saved here
25 Oct 2026 05:17:25 UTC
Source terms
NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

Source: nvd · NIST NVD usage terms; underlying source attribution retained. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · ce714d77-add3-4f53-aff5-83d477b104bb · Secondary · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

osv · GHSA-7p8r-x3mc-p8w7

Published

### Impact `fast-uri` v4.1.1 and earlier require a literal `//` to recognize a URI authority, so a reference that uses `\\`, `/\`, or `\/` as the authority introducer (in place of `//`, after an optional scheme) is parsed with no authority: the sequence and everything after it fold into the path. Node's native WHATWG `URL` (used by `fetch()`, `undici`, and Node's `http`/`https` clients) instead treats `\` as interchangeable with `/` for special schemes (`http`, `https`, `ws`, `wss`, `ftp`, `file`), so the two parsers extract different hosts from the same input. For example, `fast-uri` resolves `\\evil.com/path` against base `https://allowed.com/` to `https://allowed.com/%5C%5Cevil.com/path` (confined to the trusted host), while Node's WHATWG URL resolves the same reference to `https://evil.com/path`. Applications that use `fast-uri` to enforce host-based policy (allowlists, denylists, loopback/SSRF filtering, redirect validation, outbound proxy routing) before passing the same URL into Node's URL or `fetch()` consumers see a policy/use desync and can be steered to an unintended destination. ### Patches Upgrade to `fast-uri` v4.1.2, v3.1.5, v2.4.4. ### Workarounds None. Upgrade to the patched version.

Source published
3 Aug 2026 19:16:43 UTC
Source modified
10 Sep 2026 03:50:53 UTC
Saved here
24 Oct 2026 13:17:17 UTC
Source terms
GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Publisher rating · HIGH

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 15 Nov 11:08 UTC · 256 of 275 readable · 252 fully read · documentation 469/469 current