CVE-2026-75899

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 — Patch released 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 is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 up to but not including 3.1.6, and 4.0.0 up to but not including 4.1.3. The issue is fixed in 2.4.5, 3.1.6, and 4.1.3, which normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version.

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

August 24, 2026

Last Modified

September 2, 2026

Advisory Details (2)

Auto-updated Aug 24, 2026
Patch available. Sources: github.
generic

Security Advisories | OpenJS Foundation CVE Numbering Authority

https://cna.openjsf.org/security-advisories.html
githubMentions a patch (unverified)

fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding · Advisory · fastify/fast-uri · GitHub

https://github.com/fastify/fast-uri/security/advisories/GHSA-fph4-wmhf-6fwf

Vendor Advisories for CVE-2026-75899(20)

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

Patch Availability(30)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhdh/red-hat-developer-hub-backstage-plugin-scaffolder-backend-module-orchestrator:17912496402026-10-06redhat
redhatforeman-0:3.18.0.14-1.el9sat2026-10-01redhat
redhatsatellite/iop-vulnerability-frontend-rhel9:17904836082026-10-01redhat
redhatcluster-observability-operator/troubleshooting-panel-console-plugin-rhel9:17908544942026-10-01redhat
redhatmulticluster-engine/console-mce-rhel9:17901353232026-09-28redhat
redhatrhacm2/console-rhel9:17882836122026-09-28redhat
redhatmulticluster-engine/console-mce-rhel9:17901330812026-09-28redhat
redhatcockpit-image-builder-0:94.4-1.el10_22026-09-24redhat
redhatnetwork-observability/network-observability-console-plugin-rhel9:17899782772026-09-23redhat
redhatansible-automation-platform-tech-preview/mcp-server-rhel9:17896690362026-09-23redhat
redhatopenshift4/nmstate-console-plugin-rhel9:17895678492026-09-22redhat
redhatopenshift4/nmstate-console-plugin-rhel9:17895928062026-09-22redhat
redhatrhdh/rhdh-hub-rhel9:17895542852026-09-21redhat
redhatsatellite/iop-remediations-rhel9:17896150952026-09-17redhat
redhatsatellite/iop-advisor-frontend-rhel9:17896595732026-09-17redhat
redhatdevspaces/dashboard-rhel9:17891628842026-09-17redhat
redhatrhmtc/openshift-migration-ui-rhel8:17895463732026-09-17redhat
redhatsatellite/iop-remediations-rhel9:17896155932026-09-17redhat
redhatsatellite/iop-host-inventory-frontend-rhel9:17896245192026-09-17redhat
redhatsatellite/iop-vulnerability-frontend-rhel9:17896609832026-09-17redhat
redhatsatellite/iop-host-inventory-frontend-rhel9:17896131072026-09-17redhat
redhatsatellite/iop-advisor-frontend-rhel9:17896595652026-09-17redhat
redhatrhem/flightctl-ui-rhel10:17894881112026-09-16redhat
redhatrhem/flightctl-ui-rhel9:17894867502026-09-16redhat
redhatrhem/flightctl-ui-ocp-rhel9:17894864462026-09-16redhat
redhatrhem/flightctl-ui-rhel10:17894861812026-09-16redhat
redhatrhacm2/console-rhel9:17888834722026-09-15redhat
redhatrhacm2/console-rhel9:17888809802026-09-15redhat
redhatansible-automation-platform-27/mcp-server-rhel9:17889157362026-09-14redhat
redhatansible-automation-platform/automation-portal:17887757482026-09-08redhat

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 rangeFix by version rangeDependents
node-ajv8.12.0~ds+~2.1.1-5 ... 8.20.0~ds+~cs7.1.6-1 (15 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
node-ajv8.12.0~ds+~2.1.1-5 ... 8.20.0~ds+~cs7.1.3-3 (12 versions)
  • every version up to 8.20.0~ds+~cs7.1.4-1: fixed in 8.20.0~ds+~cs7.1.4-1
—
npm(1)
PackageVulnerable rangeFix by version rangeDependents
fast-uri—
  • 2.4.1 up to 2.4.5: fixed in 2.4.5
  • 3.1.2 up to 3.1.6: fixed in 3.1.6
  • 4.0.0 up to 4.1.3: fixed in 4.1.3
—

Weakness Classification(2)

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

Additional Vendor Advisories

(16)

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 24× in last 7d / 106× 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 156 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-75899?
CVE-2026-75899 is a high vulnerability published on August 24, 2026. fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such…
When was CVE-2026-75899 disclosed?
CVE-2026-75899 was first published on August 24, 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-2026-75899 actively exploited?
CVE-2026-75899 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-2026-75899?
CVE-2026-75899 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-2026-75899?
A fix for CVE-2026-75899 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-75899 are linked in the Vendor Advisories panel on this page.

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