fast-uri is a URI parser for Node.js. During parsing it runs a legacy decoding pass over the scheme component and never re-escapes the result, and serialization writes the scheme back out verbatim, unlike the host component which is re-escaped. As a result an input whose scheme carries percent-encoded slashes parses as a scheme with no authority, so the parsed host and error are both undefined, yet resolving or normalizing that same input emits a network-path reference whose authority is attacker-chosen and re-parses to that host. An application that allowlists on the parsed host, or treats a reference with no authority as safe to resolve against its base, gets the opposite of what it checked, giving an off-site redirect, server-side request forgery, or address-policy bypass. The legacy decoder also expands non-standard escape forms, widening the issue past upstream filters, and control characters in the scheme can reach the output as raw carriage return and line feed. 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 reject a scheme that is not valid after decoding. Users should upgrade to a patched version.
CVE-2026-76172
“—” 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-2026-64773 (ENISA EUVD) · GHSA-jqff-g426-hqxp (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
- 14th
- 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 2026-10-31). 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
August 24, 2026
Last Modified
October 14, 2026
Advisory Details (2)
Auto-updated Aug 24, 2026Security Advisories | OpenJS Foundation CVE Numbering Authority
https://cna.openjsf.org/security-advisories.htmlfast-uri vulnerable to host confusion via percent-encoded scheme normalization · Advisory · fastify/fast-uri · GitHub
https://github.com/fastify/fast-uri/security/advisories/GHSA-jqff-g426-hqxpVendor Advisories for CVE-2026-76172(20)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- 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
- RHSA-2026:79088Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat Developer Hub 1.10.5 release.
- RHSA-2026:76788Red Hat Product SecurityCritical
Red Hat Security Advisory: Red Hat Developer Hub 1.10.5 Plugin Catalog GA plugins release.
- +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+~cs7.1.6-1 (15 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(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(21)
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
Data Freshness Timeline
(refreshed 11× in last 7d / 64× 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 203 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 103 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 0.2% · 14th percentile
- 2026-11-01 07:39 UTCEG score recompute
- 2026-11-01 07:39 UTCGHSA enrichmentGHSA-jqff-g426-hqxp · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-28 19:36 UTCEG score recompute
- 2026-10-28 19:36 UTCVendor advisory
- 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-25 14:02 UTCEG score recompute
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-21 12:14 UTCEG score recompute
- 2026-10-21 12:14 UTCVendor advisory
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-18 03:13 UTCEG score recompute
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.2% · 13th percentile
Show 75 moreShow fewer
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-14 13:33 UTCEG score recompute
- 2026-10-14 13:33 UTCVendor advisory
- 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.2% · 13th percentile
- 2026-10-13 07:13 UTCEG score recompute
- 2026-10-13 07:13 UTCVendor advisory
- 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-12 15:38 UTCEG score recompute
- 2026-10-11 19:24 UTCEG score recompute
- 2026-10-11 16:40 UTCEG score recompute
- 2026-10-11 13:59 UTCEG score recompute
- 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-10 13:13 UTCEG score recompute
- 2026-10-10 13:13 UTCVendor advisory
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-09 05:00 UTCEG score recompute
- 2026-10-09 05:00 UTCVendor advisory
- 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-08 04:15 UTCEG score recompute
- 2026-10-08 04:15 UTCVendor advisory
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-07 06:52 UTCVendor advisory
- 2026-10-06 19:20 UTCEG score recompute
- 2026-10-06 19:20 UTCVendor advisory
- 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-06 07:46 UTCEG score recompute
- 2026-10-06 07:46 UTCVendor advisory
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-05 17:04 UTCVendor advisory
- 2026-10-05 04:46 UTCEG score recompute
- 2026-10-05 04:46 UTCVendor advisory
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-04 15:36 UTCVendor advisory
- 2026-10-04 04:05 UTCVendor advisory
- 2026-10-03 16:33 UTCEG score recompute
- 2026-10-03 16:33 UTCVendor advisory
- 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-02 20:58 UTCEG score recompute
- 2026-10-02 20:58 UTCVendor advisory
- 2026-10-02 08:39 UTCVendor advisory
- 2026-10-01 21:08 UTCEG score recompute
- 2026-10-01 21:08 UTCVendor advisory
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-10-01 07:52 UTCVendor advisory
- 2026-09-30 20:19 UTCEG score recompute
- 2026-09-30 20:19 UTCVendor advisory
- 2026-09-30 07:18 UTCEG score recompute
- 2026-09-30 07:18 UTCVendor advisory
- 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.2% · 12th percentile
- 2026-09-29 15:16 UTCVendor advisory
- 2026-09-28 23:22 UTCEG score recompute
- 2026-09-28 23:22 UTCVendor advisory
- 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-09-28 11:25 UTCVendor advisory
- 2026-09-27 23:54 UTCEG score recompute
- 2026-09-27 23:54 UTCVendor advisory
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-09-27 12:15 UTCVendor advisory
- 2026-09-27 00:44 UTCEG score recompute
- 2026-09-27 00:44 UTCVendor advisory
- 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-09-25 06:34 UTCVendor advisory
- 2026-09-24 19:02 UTCEG score recompute
- 2026-09-24 19:02 UTCVendor advisory
- 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 31st percentile
- 2026-09-24 07:31 UTCVendor advisory
- 2026-09-23 19:59 UTCEG score recompute
- 2026-09-23 19:59 UTCVendor advisory
- 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 14th percentile
- 2026-09-23 07:10 UTCVendor advisory
- 2026-09-22 19:39 UTCEG score recompute
- 2026-09-22 19:39 UTCVendor advisory
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:13:node-ajv
Same vendor
10 shownredhat:RHSA-2026:60855 · redhat:RHSA-2026:65118 · redhat:RHSA-2026:67279
Frequently asked(5)
What is CVE-2026-76172?
When was the CVE record for CVE-2026-76172 published?
Is CVE-2026-76172 actively exploited?
What is the CVSS score of CVE-2026-76172?
How do I remediate CVE-2026-76172?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-76172
Is Your Infrastructure Affected by CVE-2026-76172?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.