@fastify/static is a Fastify plugin that serves static files from a configured root directory. In versions before 10.1.4, on a case-insensitive filesystem such as Windows or the default macOS volume, a route guard or allowedPath restriction can be bypassed by altering the letter case of a path segment. The route matcher is case-sensitive while the filesystem is not, so a request that changes the case of a protected segment does not match the guarded route and falls through to the static handler, yet the filesystem resolves it to the same protected file. As a result, an unauthenticated request can read a file that a route guard or allowedPath was configured to protect. The issue does not affect case-sensitive filesystems and is not a directory traversal, since nothing is served from outside the configured root. The issue is fixed in @fastify/static 10.1.4, which validates the requested path against its actual on-disk spelling and rejects case-aliased paths before authorization. As a workaround, serve static files from a case-sensitive filesystem, or ensure route guards and allowedPath rules account for every letter-case variant of the protected paths.
CVE-2026-90982
“—” beside the score: it is equal to the CVSS score beside it.
This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (47th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-81383 (ENISA EUVD)Source: ENISA EUVD
- Lower severity and no public exploit yet
No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.
The CVE record's CNA (OpenJS Foundation) lists @fastify/static versions before 10.1.4 as affected, and @fastify/static versions 10.1.4 as unaffected. No release containing a fix is confirmed on record.
- CVSS v3
- 5.3
- EG Score
- 5.3MEDIUMmedium confidence
- EG Risk
- 39EG Risk 39/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity53% × 45%Impact severity (EG Severity): CVSS 5.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.6% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: No fix is confirmed yet. Check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule at low or medium mission impact and sooner than that at high. - EPSS PROB
- 0.6%
- EPSS %ILE
- 47th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.
- EG Severity
- 5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
- EG Likelihood
- 0.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).
No fix is confirmed yet. Check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.
No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
September 17, 2026
Last Modified
September 18, 2026
Advisory Details (2)
Auto-updated Sep 17, 2026Security Advisories | OpenJS Foundation CVE Numbering Authority
https://cna.openjsf.org/security-advisories.html@fastify/static vulnerable to route guard bypass via path case-folding · Advisory · fastify/fastify-static · GitHub
https://github.com/fastify/fastify-static/security/advisories/GHSA-r799-r9gc-m956Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 8× in last 7d / 45× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 76 is merged into the row it repeats.
- 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-29 22:25 UTCOSV refresh
- 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-25 13:51 UTCEG score recompute
- 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
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- 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-22 12:31 UTCEG score recompute
- 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-18 03:00 UTCEG score recompute
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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- 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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- 2026-10-12 14:46 UTCEG score recompute
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- 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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- 2026-10-08 17:14 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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- 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-04 11:28 UTCEG score recompute
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- 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-10-01 12:56 UTCEG score recompute
- 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-30 13:26 UTCEG score recompute
- 2026-09-29 13:48 UTCEG score recompute
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- 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-27 14:47 UTCEG score recompute
- 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-26 15:17 UTCEG score recompute
- 2026-09-24 16:17 UTCEG score recompute
- 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 45th percentile
- 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-09-22 17:16 UTCEG score recompute
- 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-09-21 17:46 UTCEG score recompute
- 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-09-19 18:44 UTCEG score recompute
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-09-18 12:52 UTCEG score recompute
- 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-09-17 13:21 UTCEG score recompute
- 2026-09-17 12:53 UTCEG score recompute
- 2026-09-17 07:27 UTCEG score recompute
- 2026-09-17 06:59 UTCEG score recomputeFirst assessed: 5.3 MEDIUM
- 2026-09-17 06:59 UTCMITRE cvelistV5first tracked
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Frequently asked(5)
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Dependency Blast Radius
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