fast-uri vulnerable to host confusion via backslash authority introducer
Exploitation and risk
Source statusCISA 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.
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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
Publishedfast-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
Publishedfast-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
Publishedfast-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