CVE-2026-18446

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (11th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 31, 2026

Last Modified

September 2, 2026

Advisory Details (2)

Auto-updated Jul 31, 2026
Patch available. Sources: github.
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html
github Patch Available

fast-uri vulnerable to host confusion via backslash authority introducer · Advisory · fastify/fast-uri · GitHub

https://github.com/fastify/fast-uri/security/advisories/GHSA-7p8r-x3mc-p8w7

Vendor Advisories for CVE-2026-18446(6)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatopenshift4/nmstate-console-plugin-rhel9:17895928062026-09-22redhat
redhatopenshift4/nmstate-console-plugin-rhel9:17895678492026-09-22redhat
redhatopenshift4/ose-monitoring-plugin-rhel9:17882357122026-09-10redhat
redhatgrafana13-1-main-13.1.1-0.4.hum12026-08-01redhat
redhatgrafana12-4-main-12.4.6-0.3.hum12026-08-01redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-ajv8.12.0~ds+~2.1.1-5 ... 8.20.0~ds+~cs7.1.4-1 (13 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-ajv8.12.0~ds+~2.1.1-5 ... 8.20.0~ds+~cs7.1.2-1 (9 versions)8.20.0~ds+~cs7.1.3-1—
npm(1)
PackageVulnerable rangeFixed inDependents
fast-uri—4.1.2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 83× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 191 total refreshes for this CVE.

  1. 2026-09-29 15:20 UTCEPSS rescore
  2. 2026-09-29 06:50 UTCEG score recompute
  3. 2026-09-29 06:50 UTCVendor advisory
  4. 2026-09-28 13:51 UTCEPSS rescore
  5. 2026-09-28 06:25 UTCVendor advisory
  6. 2026-09-27 18:56 UTCEG score recompute
  7. 2026-09-27 18:56 UTCVendor advisory
  8. 2026-09-27 13:47 UTCEPSS rescore
  9. 2026-09-26 15:58 UTCEPSS rescore
  10. 2026-09-25 04:52 UTCEG score recompute
  11. 2026-09-25 04:52 UTCVendor advisory
  12. 2026-09-24 08:56 UTCVendor advisory
  13. 2026-09-23 21:27 UTCEG score recompute
  14. 2026-09-23 21:27 UTCVendor advisory
  15. 2026-09-23 09:03 UTCVendor advisory
  16. 2026-09-22 21:34 UTCEG score recompute
  17. 2026-09-22 21:34 UTCVendor advisory
  18. 2026-09-22 07:46 UTCEG score recompute
  19. 2026-09-22 07:46 UTCVendor advisory
  20. 2026-09-20 11:12 UTCVendor advisory
  21. 2026-09-19 23:43 UTCEG score recompute
  22. 2026-09-19 23:43 UTCVendor advisory
  23. 2026-09-19 01:19 UTCEG score recompute
  24. 2026-09-19 01:19 UTCVendor advisory
  25. 2026-09-18 19:27 UTCEPSS rescore
Show 75 more
  1. 2026-09-18 13:31 UTCVendor advisory
  2. 2026-09-18 01:16 UTCEG score recompute
  3. 2026-09-18 01:16 UTCVendor advisory
  4. 2026-09-17 01:24 UTCEG score recompute
  5. 2026-09-17 01:24 UTCVendor advisory
  6. 2026-09-16 14:07 UTCEPSS rescore
  7. 2026-09-16 05:29 UTCEG score recompute
  8. 2026-09-16 05:29 UTCVendor advisory
  9. 2026-09-16 05:14 UTCEPSS rescore
  10. 2026-09-15 03:02 UTCVendor advisory
  11. 2026-09-14 11:54 UTCVendor advisory
  12. 2026-09-14 00:24 UTCEG score recompute
  13. 2026-09-14 00:24 UTCVendor advisory
  14. 2026-09-13 16:46 UTCEPSS rescore
  15. 2026-09-13 12:55 UTCVendor advisory
  16. 2026-09-13 01:26 UTCEG score recompute
  17. 2026-09-13 01:26 UTCVendor advisory
  18. 2026-09-12 15:00 UTCEPSS rescore
  19. 2026-09-12 13:57 UTCVendor advisory
  20. 2026-09-12 02:28 UTCVendor advisory
  21. 2026-09-11 14:58 UTCEG score recompute
  22. 2026-09-11 14:58 UTCVendor advisory
  23. 2026-09-11 14:52 UTCEPSS rescore
  24. 2026-09-11 09:36 UTCEPSS rescore
  25. 2026-09-11 02:23 UTCVendor advisory
  26. 2026-09-10 14:52 UTCEG score recompute
  27. 2026-09-10 14:52 UTCVendor advisory
  28. 2026-09-10 09:34 UTCEPSS rescore
  29. 2026-09-10 03:22 UTCVendor advisory
  30. 2026-09-09 07:05 UTCEG score recompute
  31. 2026-09-09 07:05 UTCVendor advisory
  32. 2026-09-08 22:00 UTCEPSS rescore
  33. 2026-09-07 19:34 UTCEG score recompute
  34. 2026-09-07 19:34 UTCVendor advisory
  35. 2026-09-07 16:01 UTCEPSS rescore
  36. 2026-09-06 18:15 UTCEG score recompute
  37. 2026-09-06 18:15 UTCVendor advisory
  38. 2026-09-06 13:47 UTCEPSS rescore
  39. 2026-09-06 06:36 UTCVendor advisory
  40. 2026-09-05 18:46 UTCEG score recompute
  41. 2026-09-05 18:46 UTCVendor advisory
  42. 2026-09-05 04:45 UTCEG score recompute
  43. 2026-09-05 04:45 UTCVendor advisory
  44. 2026-09-04 10:30 UTCEG score recompute
  45. 2026-09-04 10:30 UTCVendor advisory
  46. 2026-09-04 05:06 UTCEPSS rescore
  47. 2026-09-03 21:10 UTCVendor advisory
  48. 2026-09-03 09:10 UTCVendor advisory
  49. 2026-09-02 14:46 UTCEG score recompute
  50. 2026-09-02 14:46 UTCVendor advisory
  51. 2026-09-02 14:11 UTCEPSS rescore
  52. 2026-09-01 22:34 UTCEG score recompute
  53. 2026-09-01 22:33 UTCVendor advisory
  54. 2026-09-01 13:53 UTCEPSS rescore
  55. 2026-09-01 04:39 UTCEPSS rescore
  56. 2026-08-31 23:25 UTCVendor advisory
  57. 2026-08-30 21:39 UTCEG score recompute
  58. 2026-08-30 21:39 UTCVendor advisory
  59. 2026-08-30 19:17 UTCEPSS rescore
  60. 2026-08-30 10:10 UTCEG score recompute
  61. 2026-08-30 10:10 UTCVendor advisory
  62. 2026-08-30 01:22 UTCEPSS rescore
  63. 2026-08-29 22:23 UTCEG score recompute
  64. 2026-08-29 22:23 UTCVendor advisory
  65. 2026-08-28 21:41 UTCEPSS rescore
  66. 2026-08-28 21:09 UTCVendor advisory
  67. 2026-08-27 20:46 UTCEG score recompute
  68. 2026-08-27 20:46 UTCVendor advisory
  69. 2026-08-27 14:25 UTCEPSS rescore
  70. 2026-08-27 08:50 UTCVendor advisory
  71. 2026-08-26 19:15 UTCEG score recompute
  72. 2026-08-26 19:15 UTCVendor advisory
  73. 2026-08-26 14:46 UTCEPSS rescore
  74. 2026-08-26 05:03 UTCVendor advisory
  75. 2026-08-25 17:32 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-18446?
CVE-2026-18446 is a high vulnerability published on July 31, 2026. 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…
When was CVE-2026-18446 disclosed?
CVE-2026-18446 was first published on July 31, 2026, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18446 actively exploited?
CVE-2026-18446 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18446?
CVE-2026-18446 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18446?
A fix for CVE-2026-18446 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-18446 are linked in the Vendor Advisories panel on this page.

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