CVE-2026-6321

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: 0.6%, top 52% of all CVEs by exploit prediction. 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

fast-uri decoded percent-encoded path separators and dot segments before applying dot-segment removal in its normalize() and equal() functions. Encoded path data was treated like real slashes and parent-directory references, so distinct URIs could collapse onto the same normalized path. Applications that normalize or compare attacker-controlled URLs to enforce path-based policy can be bypassed, with a path that appears confined under an allowed prefix normalizing to a different location. Versions <= 3.1.0 are affected. Update to 3.1.1 or later.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
49%
KEV
Not listed

Published

May 4, 2026

Last Modified

September 10, 2026

Advisory Details (2)

Auto-updated May 4, 2026
Patch available. Sources: github.
github Patch Available

fast-uri vulnerable to path traversal via percent-encoded dot segments · Advisory · fastify/fast-uri · GitHub

https://github.com/fastify/fast-uri/security/advisories/GHSA-q3j6-qgpj-74h6
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html

Vendor Advisories for CVE-2026-6321(20)

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

Patch Availability(21)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatodf4/rook-ceph-rhel9-operator:17866295482026-08-19redhat
redhatodf4/rook-ceph-rhel9-operator:17870615542026-08-19redhat
redhatodf4/rook-ceph-rhel9-operator:17867031432026-08-18redhat
redhatodf4/rook-ceph-rhel9-operator:17867068802026-08-18redhat
redhatautomation-platform-ui-0:2.6.11-1.el9ap2026-07-20redhat
redhatautomation-gateway-0:2.5.20260715-1.el9ap2026-07-20redhat
redhatrh-podman-desktop-0:1.1.1-1.el10_22026-07-09redhat
redhatcluster-observability-operator/troubleshooting-panel-console-plugin-rhel9:17828394942026-07-01redhat
redhatrhdh/rhdh-hub-rhel9:17811873422026-06-16redhat
redhatodf4/rook-ceph-rhel9-operator:17815574962026-06-16redhat
redhatsatellite/iop-advisor-frontend-rhel9:17811816732026-06-16redhat
redhatodf4/rook-ceph-rhel9-operator:17811844682026-06-16redhat
redhatdiscovery/discovery-ui-rhel9:17793951882026-06-15redhat
redhatio.hawt-project2026-06-10redhat
redhatrhoai/odh-mod-arch-model-registry-rhel9:17804671472026-06-10redhat
redhatdevspaces/dashboard-rhel9:17806851762026-06-10redhat
redhatansible-automation-platform-25/lightspeed-rhel8:17800829492026-06-09redhat
redhatansible-automation-platform-tech-preview/mcp-server-rhel9:17797832482026-06-09redhat
redhatnetwork-observability/network-observability-console-plugin-rhel9:17805560692026-06-08redhat
redhatrhdh/rhdh-hub-rhel9:17798415862026-05-27redhat
redhatodf4/rook-ceph-rhel9-operator:17785776962026-05-19redhat

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

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
node-ajv6.12.6-3 ... 8.8.2~ds+~2.1.1-1 (21 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
node-ajv8.12.0~ds+~2.1.1-5 ... 8.20.0~ds+~cs7.1.5-1 (14 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
node-ajv8.12.0~ds+~2.1.1-5 ... 8.18.0~ds+~cs6.1.1-2 (7 versions)8.20.0~ds+~cs6.1.3-1—
npm(1)
PackageVulnerable rangeFixed inDependents
fast-uri—2.4.1—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 4× in last 7d / 48× 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 241 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-6321?
CVE-2026-6321 is a high vulnerability published on May 4, 2026. fast-uri decoded percent-encoded path separators and dot segments before applying dot-segment removal in its normalize() and equal() functions. Encoded path data was treated like real slashes and parent-directory references, so distinct URIs could collapse onto the same normalized path.…
When was CVE-2026-6321 disclosed?
CVE-2026-6321 was first published in the National Vulnerability Database on May 4, 2026, with the most recent update on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6321 actively exploited?
CVE-2026-6321 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.1% of all scored CVEs.
What is the CVSS score of CVE-2026-6321?
CVE-2026-6321 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-6321?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6321, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-6321

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