fast-uri is a URI parser for Node.js. Its custom parser for bracketed IPv6 literals does not validate the complete IPv6 grammar, so invalid trailing text in an authority can be silently discarded and a malformed attacker-controlled host is turned into a different valid IPv6 destination. For example, a bracketed literal with invalid trailing characters is normalized to the unspecified address, which a Node HTTP client then connects to a local service over loopback, and other malformed literals collapse to private-range addresses. No error is set on the parsed result, so an application checking the error field cannot detect the rewrite. An application that normalizes untrusted URLs before outbound requests, redirects, proxy routing, or address-policy enforcement can be redirected to a local or private IPv6 target, giving a server-side request forgery and address-policy bypass primitive. The affected versions are 2.3.1 up to but not including 2.4.5, 3.0.0 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 validate bracketed IP literals against the full grammar and mark malformed literals as authority errors. Users should upgrade to a patched version.
CVE-2026-75975
“—” beside the score: it is equal to the CVSS score beside it.
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-02. A secondary CVSS source baseline 7.5; sources differ by 0.0.
Also known asEUVD-2026-64772 (ENISA EUVD) · GHSA-f65p-4m7j-42xc (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.Exploitation0.2% × 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
- 0.2%
- EPSS %ILE
- 12th
- 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
- 0.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-11). 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
August 24, 2026
Last Modified
October 14, 2026
Advisory Details (2)
Auto-updated Aug 24, 2026fast-uri vulnerable to server-side request forgery via malformed IPv6 normalization · Advisory · fastify/fast-uri · GitHub
https://github.com/fastify/fast-uri/security/advisories/GHSA-f65p-4m7j-42xcSecurity Advisories | OpenJS Foundation CVE Numbering Authority
https://cna.openjsf.org/security-advisories.htmlVendor Advisories for CVE-2026-75975(20)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:95591Red Hat Product SecurityHigh
Red Hat Security Advisory: Cluster Observability Operator - 1.5
- RHSA-2026:95081Red Hat Product SecurityHigh
Red Hat Security Advisory: Cluster Observability Operator - 1.5
- RHSA-2026:92650Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.19.26 security, enhancement & bug fix update
- RHSA-2026:92510Red Hat Product SecurityCritical
Red Hat Security Advisory: RHOAI 3.4.6 - Red Hat OpenShift AI
- 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
- RHSA-2026:82151Red Hat Product SecurityCritical
Red Hat Security Advisory: Ansible automation portal Red Hat Enterprise Linux Images
- +12 more
Patch Availability(33)
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)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-ajv | 8.12.0~ds+~2.1.1-5 ... 8.20.0~ds+~cs7.1.6-2 (16 versions) |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-ajv | 8.12.0~ds+~2.1.1-5 ... 8.20.0~ds+~cs7.1.3-3 (12 versions) |
| — |
npm(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| fast-uri | — |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(23)
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.
- Red HatRHSA-2026:60855IMPORTANT2026-08-24
RHSA-2026:60855 — Important
- Red HatRHSA-2026:60856IMPORTANT2026-08-24
RHSA-2026:60856 — Important
- Red HatRHSA-2026:60866IMPORTANT2026-08-24
RHSA-2026:60866 — Important
- Red HatRHSA-2026:61783IMPORTANT2026-08-24
RHSA-2026:61783 — Important
- Red HatRHSA-2026:65118IMPORTANT2026-08-24
RHSA-2026:65118 — Important
- Red HatRHSA-2026:65155IMPORTANT2026-08-24
RHSA-2026:65155 — Important
- Red HatRHSA-2026:67279IMPORTANT2026-08-24
RHSA-2026:67279 — Important
- Red HatRHSA-2026:67542IMPORTANT2026-08-24
RHSA-2026:67542 — Important
- Red HatRHSA-2026:67543IMPORTANT2026-08-24
RHSA-2026:67543 — Important
- Red HatRHSA-2026:68006IMPORTANT2026-08-24
RHSA-2026:68006 — Important
- Red HatRHSA-2026:68044IMPORTANT2026-08-24
RHSA-2026:68044 — Important
- Red HatRHSA-2026:68253IMPORTANT2026-08-24
RHSA-2026:68253 — Important
- Red HatRHSA-2026:68254IMPORTANT2026-08-24
RHSA-2026:68254 — Important
- Red HatRHSA-2026:68681IMPORTANT2026-08-24
RHSA-2026:68681 — Important
- Red HatRHSA-2026:68747IMPORTANT2026-08-24
RHSA-2026:68747 — Important
- Red HatRHSA-2026:68748IMPORTANT2026-08-24
RHSA-2026:68748 — Important
- Red HatRHSA-2026:68750IMPORTANT2026-08-24
RHSA-2026:68750 — Important
- Red HatRHSA-2026:68754IMPORTANT2026-08-24
RHSA-2026:68754 — Important
- Red HatRHSA-2026:68755IMPORTANT2026-08-24
RHSA-2026:68755 — Important
- Red HatRHSA-2026:68756IMPORTANT2026-08-24
RHSA-2026:68756 — Important
- Red HatRHSA-2026:68762IMPORTANT2026-08-24
RHSA-2026:68762 — Important
- Red HatRHSA-2026:68765IMPORTANT2026-08-24
RHSA-2026:68765 — Important
- Red HatRHSA-2026:68766IMPORTANT2026-08-24
RHSA-2026:68766 — Important
Data Freshness Timeline
(refreshed 9× in last 7d / 37× 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 217 rows 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 117 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-12 03:17 UTCEchelonGraph re-scored
- 2026-11-12 03:17 UTCVendor advisory
- 2026-11-12 03:17 UTCGHSA enrichmentGHSA-f65p-4m7j-42xc · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-05 01:27 UTCEchelonGraph re-scored
- 2026-11-05 01:27 UTCVendor advisory
- 2026-11-05 01:27 UTCGHSA enrichmentGHSA-f65p-4m7j-42xc · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-11-01 07:39 UTCGHSA enrichmentGHSA-f65p-4m7j-42xc · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-11-01 07:39 UTCEchelonGraph re-scored
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-28 23:37 UTCEchelonGraph re-scored
- 2026-10-28 23:37 UTCVendor advisory
Show 75 moreShow fewer
- 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-25 14:02 UTCEchelonGraph re-scored
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-21 15:23 UTCEchelonGraph re-scored
- 2026-10-21 15:23 UTCVendor advisory
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-18 03:13 UTCEchelonGraph re-scored
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-14 13:33 UTCEchelonGraph re-scored
- 2026-10-14 13:33 UTCVendor advisory
- 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-13 07:15 UTCEchelonGraph re-scored
- 2026-10-13 07:15 UTCVendor advisory
- 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-12 15:38 UTCEchelonGraph re-scored
- 2026-10-11 19:24 UTCEchelonGraph re-scored
- 2026-10-11 16:40 UTCEchelonGraph re-scored
- 2026-10-11 13:59 UTCEchelonGraph re-scored
- 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-10 13:13 UTCEchelonGraph re-scored
- 2026-10-10 13:13 UTCVendor advisory
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-09 05:00 UTCEchelonGraph re-scored
- 2026-10-09 05:00 UTCVendor advisory
- 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-08 04:15 UTCEchelonGraph re-scored
- 2026-10-08 04:15 UTCVendor advisory
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-07 04:51 UTCVendor advisory
- 2026-10-06 16:42 UTCEchelonGraph re-scored
- 2026-10-06 16:42 UTCVendor advisory
- 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-06 02:56 UTCEchelonGraph re-scored
- 2026-10-06 02:56 UTCVendor advisory
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-05 09:22 UTCEchelonGraph re-scored
- 2026-10-05 09:22 UTCVendor advisory
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-04 20:44 UTCVendor advisory
- 2026-10-04 05:01 UTCVendor advisory
- 2026-10-03 16:33 UTCEchelonGraph re-scored
- 2026-10-03 16:33 UTCVendor advisory
- 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-02 21:34 UTCEchelonGraph re-scored
- 2026-10-02 21:34 UTCVendor advisory
- 2026-10-02 09:14 UTCVendor advisory
- 2026-10-01 21:08 UTCEchelonGraph re-scored
- 2026-10-01 21:08 UTCVendor advisory
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-10-01 08:26 UTCVendor advisory
- 2026-09-30 20:19 UTCEchelonGraph re-scored
- 2026-09-30 20:19 UTCVendor advisory
- 2026-09-30 07:18 UTCEchelonGraph re-scored
- 2026-09-30 07:18 UTCVendor advisory
- 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.2% · 11th percentile
- 2026-09-29 15:18 UTCVendor advisory
- 2026-09-29 01:42 UTCEchelonGraph re-scored
- 2026-09-29 01:42 UTCVendor advisory
- 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 29th percentile
- 2026-09-28 13:10 UTCVendor advisory
- 2026-09-28 01:03 UTCEchelonGraph re-scored
- 2026-09-28 01:03 UTCVendor advisory
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
Related CVEs(same product + same vendor + same CWE)· as of November 11, 2026
Same product
10 shownnpm:fast-uri
Same vendor
10 shownredhat:RHSA-2026:60855 · redhat:RHSA-2026:65118 · redhat:RHSA-2026:67279
Frequently asked(5)
What is CVE-2026-75975?
When was the CVE record for CVE-2026-75975 published?
Is CVE-2026-75975 actively exploited?
What is the CVSS score of CVE-2026-75975?
How do I remediate CVE-2026-75975?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-75975
Is Your Infrastructure Affected by CVE-2026-75975?
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