EUVD-2026-64763Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Network-reachable, no auth needed, low complexity; added C:L because SSRF inherently enables reading responses from internal services beyond the integrity bypass.
Primary rating from Vendor (openjs).
CVSS VectorVendor: openjs
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
3DescriptionCVE.org
fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input into a different network destination such as a loopback hostname or address. For example, a doubly encoded host that spells out a loopback name decodes to that live host in one operation, which contradicts RFC 3986 section 2.4 that an implementation must not decode the same string more than once. An application that normalizes or resolves an untrusted HTTP-family URI before outbound routing, redirect validation, or a host-policy check can receive a destination different from the one the original encoded host represented, giving a server-side request forgery and host-policy bypass primitive. This is an incomplete-fix variant of CVE-2026-6322. The affected versions are 2.4.1 up to but not including 2.4.5, 3.1.2 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 normalize percent escapes once and preserve encoded percent signs. Users should upgrade to a patched version.
Articles & Coverage 2
AnalysisAI
Double-decoding of percent-encoded hostnames in fast-uri (Node.js URI parser) creates a server-side request forgery and host-policy bypass primitive in versions 2.4.1-2.4.4, 3.1.2-3.1.5, and 4.0.0-4.1.2. The library decodes percent escapes once during hostname parsing and again during authority recomposition, so a single normalize or resolve call on a doubly-encoded input can silently resolve to a different network destination - including loopback addresses - than the encoded form represents. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerable condition is triggered when an application passes an untrusted URI containing a doubly percent-encoded hostname to fast-uri's normalize or resolve functions - not merely to its parser. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 High score (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N) accurately captures the remote, unauthenticated, low-complexity nature of the attack vector. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker submits a crafted HTTP request to a vulnerable application containing a URI with a doubly percent-encoded hostname - for example, encoding 'localhost' such that two rounds of percent-decoding are required to reveal it. The application calls fast-uri's normalize or resolve function to validate or rewrite the URI before forwarding, but fast-uri's two-pass decode silently transforms the encoded host into 'localhost' (or another internal address). … |
| Remediation | Upgrade fast-uri to the vendor-released patched versions: 2.4.5, 3.1.6, or 4.1.3, which normalize percent escapes exactly once and preserve encoded percent signs to prevent re-decoding. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Node.js applications and dependencies using fast-uri versions 2.4.1-2.4.4, 3.1.2-3.1.5, or 4.0.0-4.1.2, prioritizing services that make outbound network requests or handle user-supplied URLs. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
A vulnerability in the NuPoint Unified Messaging (NPM) component of Mitel MiCollab through 9.8 SP1 FP2 (9.8.1.201) could
FortiOS and FortiProxy contain an authentication bypass via the Node.js websocket module allowing unauthenticated remote
Eval injection vulnerability in the internals.batch function in lib/batch.js in the bassmaster plugin before 1.5.2 for t
Flowise version 3.0.5 contains a remote code execution vulnerability in the CustomMCP node. The mcpServerConfig paramete
Node.js 8.5.0 before 8.6.0 allows remote attackers to access unintended files, because a change to ".." handling was inc
An issue was discovered in the node-serialize package 0.0.4 for Node.js. Rated critical severity (CVSS 9.8), this vulner
Directory traversal vulnerability in the st module before 0.2.5 for Node.js allows remote attackers to read arbitrary fi
Multiple SQL injection vulnerabilities in the Manage Accounts page in the AccountManagement.asmx service in the Solarwin
The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag, whic
Directory traversal vulnerability in lib/app/index.js in Geddy before 13.0.8 for Node.js allows remote attackers to read
Credential-harvesting malware compromised 84 versions of 42 TanStack npm packages on 2026-05-11 via chained GitHub Actio
Eval injection vulnerability in index.js in the syntax-error package before 1.1.1 for Node.js 0.10.x, as used in IBM Rat
Share
External POC / Exploit Code
Leaving vuln.today