CVE-2026-22031

HIGHNVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 63% 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, nvd
Trending — 3 sources updated this weekElevated
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

@fastify/middie is the plugin that adds middleware support on steroids to Fastify. A security vulnerability exists in @fastify/middie prior to version 9.1.0 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., /%61dmin instead of /admin). While the middleware engine fails to match the encoded path and skips execution, the underlying Fastify router correctly decodes the path and matches the route handler, allowing attackers to access protected endpoints without the middleware constraints. Version 9.1.0 fixes the issue.

CVSS v3
8.4
EG Score
8.4(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity84% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

January 19, 2026

Last Modified

May 14, 2026

Advisory Details (4)

Auto-updated May 14, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Fastify Middie Middleware Path Bypass · Advisory · fastify/middie · GitHub

https://github.com/fastify/middie/security/advisories/GHSA-cxrg-g7r8-w69p
generic

Release v9.1.0 · fastify/middie · GitHub

https://github.com/fastify/middie/releases/tag/v9.1.0
generic

fix: decode paths before matching by kamilmysliwiec · Pull Request #245 · fastify/middie · GitHub

https://github.com/fastify/middie/pull/245
generic

fix: decode paths before matching (#245) · fastify/middie@d44cd56 · GitHub

https://github.com/fastify/middie/commit/d44cd56eb724490babf7b452fdbbdd37ea2effba

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@fastify/middie—9.1.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 51× 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 121 total refreshes for this CVE.

  1. 2026-07-27 01:09 UTCOSV refresh
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-26 14:54 UTCEPSS rescore
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  1. 2026-07-13 22:30 UTCEPSS rescore
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  7. 2026-07-09 19:47 UTCOSV refresh
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  27. 2026-06-27 03:08 UTCEPSS rescore
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  74. 2026-05-29 13:44 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-22031?
CVE-2026-22031 is a high vulnerability published on January 19, 2026. @fastify/middie is the plugin that adds middleware support on steroids to Fastify. A security vulnerability exists in @fastify/middie prior to version 9.1.0 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., /%61dmin instead of /admin). While…
When was CVE-2026-22031 disclosed?
CVE-2026-22031 was first published in the National Vulnerability Database on January 19, 2026, with the most recent update on May 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-22031 actively exploited?
CVE-2026-22031 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.7% of all scored CVEs.
What is the CVSS score of CVE-2026-22031?
CVE-2026-22031 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2026-22031?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-22031, 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.

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