fastify versions >= 4.0.0 and before 5.12.2 can route a malformed URL sent under one plugin prefix to the custom not-found handler of a different sibling plugin, and invoke it without the preHandler hook declared for that handler. The internal not-found router for encapsulated handlers dispatches malformed paths through a single shared handler pointer before URL decoding, ignoring the prefix and skipping the selected handler's normal lifecycle. An unauthenticated attacker can therefore reach an authentication-protected private fallback through an unrelated public prefix and read its full response, bypassing the authentication hook and breaking prefix encapsulation. Users should upgrade to fastify 5.12.2 or later.
CVE-2026-76169
“—” beside the score: it is equal to the CVSS score beside it.
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-30. A secondary CVSS source baseline 7.5; sources differ by 0.0.
Also known asEUVD-2026-70988 (ENISA EUVD) · GHSA-p68q-wchp-6fh7 (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 49EG Risk 49/100
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)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.5% × 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: 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
- 0.5%
- EPSS %ILE
- 44th
- 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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). 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.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).
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). 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.
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 4, 2026
Last Modified
September 15, 2026
Advisory Details (2)
Auto-updated Sep 4, 2026Security Advisories | OpenJS Foundation CVE Numbering Authority
https://cna.openjsf.org/security-advisories.htmlfastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers · Advisory · fastify/fastify · GitHub
https://github.com/fastify/fastify/security/advisories/GHSA-p68q-wchp-6fh7Vendor Advisories for CVE-2026-76169(5)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:90321Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat OpenShift Dev Spaces 3.31.0 Release.
- RHSA-2026:87410Red Hat Product SecurityCritical
Red Hat Security Advisory: RHOAI 2.25.12 - Red Hat OpenShift AI
- RHSA-2026:86891Red Hat Product SecurityCritical
Red Hat Security Advisory: RHOAI 3.5.2 - Red Hat OpenShift AI
- RHSA-2026:84734Red Hat Product SecurityCritical
Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI
- GHSA-p68q-wchp-6fh7GitHub Security AdvisoriesHigh
fastify vulnerable to authentication bypass via malformed URLs reaching encapsulated not-found handlers
Patch Availability(4)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | rhoai/odh-mod-arch-model-registry-rhel9:1791945940 | 2026-10-21 | redhat |
| redhat | rhoai/odh-mod-arch-model-registry-rhel9:1791853432 | 2026-10-21 | redhat |
| redhat | rhoai/odh-mod-arch-model-registry-rhel9:1791860918 | 2026-10-19 | redhat |
| npm | fastify @ 5.12.2 (fixes >= 4.0.0, < 5.12.2) | — | ghsa |
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
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| fastify | — |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 12× in last 7d / 50× 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.
Showing the most recent 100 of 104 refreshes on record for this CVE.
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. None are among the latest 100 rows. The 4 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-11-01 07:39 UTCGHSA enrichmentGHSA-p68q-wchp-6fh7 · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-01 07:39 UTCEG score recompute
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-28 23:03 UTCEG score recompute
- 2026-10-28 23:03 UTCVendor advisory
- 2026-10-28 20:25 UTCOSV refresh
- 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-25 14:02 UTCEG score recompute
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
- 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-21 00:00 UTCEG score recompute
- 2026-10-21 00:00 UTCVendor advisory
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-18 03:13 UTCEG score recompute
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
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- 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
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- 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
- 2026-10-13 07:13 UTCEG score recompute
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- 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
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- 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
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- 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
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- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
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- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
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- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
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- 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-09-05 17:37 UTCEG score recompute
- 2026-09-04 17:28 UTCEG score recompute
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownnpm:fastify
Same vendor
10 shownredhat:RHSA-2026:84734
Frequently asked(5)
What is CVE-2026-76169?
When was the CVE record for CVE-2026-76169 published?
Is CVE-2026-76169 actively exploited?
What is the CVSS score of CVE-2026-76169?
How do I remediate CVE-2026-76169?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-76169
Is Your Infrastructure Affected by CVE-2026-76169?
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