CVE-2026-92395

CRITICALPre-NVD 9.19.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (26th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source

Also known asEUVD-2026-80806 (ENISA EUVD)Source: ENISA EUVD

9.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.1Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

@fastify/proxy-addr is a Fastify plugin that determines a request's client address behind trusted reverse proxies, and it backs Fastify request.ip and request.ips. In versions 3.0.0 through 5.1.0, a trust subnet written in IPv4-mapped IPv6 notation with an IPv4-sized prefix, such as ::ffff:10.0.0.0/8 instead of the correct ::ffff:10.0.0.0/104, is accepted without error but trusts every IPv4 address on the internet rather than the block it names. Because the socket peer then becomes trusted at hop 0, any unauthenticated client can supply an arbitrary X-Forwarded-For header and control the address the application reads, which defeats IP-based access control, rate limiting, geolocation, and audit logging. The plugin inherited this defect from the upstream proxy-addr module (CVE-2026-90711). The issue is fixed in @fastify/proxy-addr 5.1.1, and users should upgrade to 5.1.1 or later. As a workaround, ensure any IPv4-mapped IPv6 trust subnet uses a prefix length of at least 97, or express the range in plain IPv4 notation.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100

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)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 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 total (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: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
26th
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 (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-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
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). 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: 3 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).

The CVE record names the fixed release. 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 total (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)3 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 total (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 16, 2026

Last Modified

September 17, 2026

Advisory Details (2)

Auto-updated Sep 16, 2026
Fix named in the CVE record. Sources: github.
Web page

Security Advisories | OpenJS Foundation CVE Numbering Authority

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

@fastify/proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet · Advisory · fastify/proxy-addr · GitHub

https://github.com/fastify/proxy-addr/security/advisories/GHSA-8cmm-mhw6-v7xq

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 31× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 123 rows on record for this CVE, as 99 entries (1 repeat merged).

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 100 is merged into the row it repeats. The 23 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:58 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  2. 2026-11-13 03:08 UTCEchelonGraph re-scored
  3. 2026-11-12 16:35 UTCEPSS rescoreEPSS 0.3% · 26th percentile
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  5. 2026-11-11 16:41 UTCEPSS rescoreEPSS 0.3% · 26th percentile
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  9. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.3% · 26th percentile
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  11. 2026-11-08 16:41 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  12. 2026-11-08 08:47 UTCEchelonGraph re-scored
  13. 2026-11-07 16:40 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  14. 2026-11-07 09:54 UTCEchelonGraph re-scored
  15. 2026-11-06 21:55 UTCOSV refresh
  16. 2026-11-06 16:40 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  17. 2026-11-06 11:04 UTCEchelonGraph re-scored
  18. 2026-11-05 16:39 UTCEPSS rescoreEPSS 0.3% · 26th percentile
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  20. 2026-11-04 16:37 UTCEPSS rescoreEPSS 0.3% · 26th percentile
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  22. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.3% · 26th percentile
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  24. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.3% · 26th percentile
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  1. 2026-11-01 16:36 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  2. 2026-10-31 17:42 UTCEchelonGraph re-scored
  3. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  4. 2026-10-30 18:51 UTCEchelonGraph re-scored
  5. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  6. 2026-10-29 20:00 UTCEchelonGraph re-scored
  7. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  8. 2026-10-28 21:10 UTCEchelonGraph re-scored
  9. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  10. 2026-10-27 22:16 UTCEchelonGraph re-scored
  11. 2026-10-27 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  12. 2026-10-26 23:21 UTCEchelonGraph re-scored
  13. 2026-10-26 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  14. 2026-10-25 21:03 UTCEchelonGraph re-scored
  15. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  16. 2026-10-25 13:50 UTCEchelonGraph re-scored
  17. 2026-10-24 22:13 UTCEchelonGraph re-scored
  18. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
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  20. 2026-10-23 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
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  24. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
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  26. 2026-10-20 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  27. 2026-10-20 03:50 UTCEchelonGraph re-scored
  28. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  30. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  33. 2026-10-17 05:56 UTCEchelonGraph re-scored
  34. 2026-10-16 16:45 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  40. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  41. 2026-10-12 21:34 UTCEchelonGraph re-scored
  42. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  47. 2026-10-11 13:50 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  50. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  56. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  58. 2026-10-06 15:19 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  60. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  62. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  63. 2026-10-03 16:18 UTCEchelonGraph re-scored
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  66. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.3% · 24th percentile
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  72. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  73. 2026-09-27 15:20 UTCEchelonGraph re-scored
  74. 2026-09-27 13:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile

Frequently asked(5)

What is CVE-2026-92395?
CVE-2026-92395 is a critical-severity vulnerability; its CVE record was published on September 16, 2026. @fastify/proxy-addr is a Fastify plugin that determines a request's client address behind trusted reverse proxies, and it backs Fastify request.ip and request.ips. In versions 3.0.0 through 5.1.0, a trust subnet written in IPv4-mapped IPv6 notation with an IPv4-sized prefix, such as…
When was the CVE record for CVE-2026-92395 published?
The CVE record for CVE-2026-92395 was published on September 16, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 17, 2026; the record at its source may have been updated since.
Is CVE-2026-92395 actively exploited?
CVE-2026-92395 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-92395?
CVE-2026-92395 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-92395?
The CVE record for CVE-2026-92395 names the fix: "The issue is fixed in @fastify/proxy-addr 5.1.1, and users should upgrade to 5.1.1 or later."

Dependency Blast Radius

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