CVE-2026-86253 h3 before 1.15.6 Path Traversal via Percent-Encoded Dot Segments

h3 npm package versions = 2.0.1-rc.14 contain a path traversal vulnerability in serveStatic. On Node.js deployments, event.url.pathname is not normalized, so percent-encoded dot segments %2e%2e are passed to decodeURI and decoded to ../ sequences without sanitization. An unauthenticated remote...

libevent: Libevent: HTTP header handling bugs create risk of access control bypass.

A flaw was found in libevent. The evhttpdecodeuriinternal function in http.c decodes percent-encoded %00 bytes into literal NUL characters without rejecting them, allowing an attacker to craft a URI such as /admin/secret%00.jpg where extension-based access checks see .jpg but the server processes...

SiYuan: path traversal via /export/temp/ short-circuit branch (incomplete fix for the export-disclosure hardening, GHSA-6865-qjcf-286f)

Summary SiYuan's /export/ file handler was hardened against export disclosure issue 12213 by adding an IsSubPathexportBaseDir, fullPath check and an IsSensitivePath check in commit bb481e1. These guards were added only to the main branch of the handler. The handler begins with a short-circuit...

NPM: fast-uri vulnerable to host confusion via percent-encoded scheme normalization

NPM: fast-uri vulnerable to host confusion via percent-encoded scheme normalization vulnerability discovered by ? in WordPress Npm fast-uri versions = 2.3.1, 2.4.5...

fast-uri vulnerable to host confusion via percent-encoded scheme normalization

Impact fast-uri decodes percent-encoded characters in the scheme component with the legacy global unescape and serializes the result back as raw characters, without re-escaping it or validating it as a scheme. A scheme that decodes to characters outside the RFC 3986 scheme grammar can therefore...

GHSA-VCC3-GHJQ-M6FR decode-uri-component: Denial of service via exponential decoding of malformed percent-encoded input

Impact An attacker who can supply input to decodeUriComponent directly or via a dependency that uses this package on URL/query/path data can cause excessive CPU usage and application unresponsiveness. This is an availability issue; there is no known memory corruption, data disclosure, or remote...

NPM: decode-uri-component: Denial of service via exponential decoding of malformed percent-encoded input

NPM: decode-uri-component: Denial of service via exponential decoding of malformed percent-encoded input vulnerability discovered by ? in WordPress Npm decode-uri-component versions = 0.4.2...

Security Bulletin: IBM InfoSphere Optim Archive Viewer is affected by a vulnerability in fast-uri (CVE-2026-6321)

Summary A hostname parsing discrepancy vulnerability in the fast-uri URI parsing library CVE-2026-6321 used by IBM InfoSphere Optim Archive Viewer has been addressed by upgrading the component to version 3.1.5. Vulnerability Details CVEID:CVE-2026-6321 DESCRIPTION: fast-uri decoded percent-encode...

fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects

A flaw was found in fast-uri, a software component used for parsing Uniform Resource Identifiers URIs in Node.js applications. This vulnerability arises from an issue in how fast-uri processes the scheme part of a URI, specifically when it contains special characters that are percent-encoded. An...

GO-2026-6271 Mailpit: WebSocket origin check bypass via percent-encoded path (regression of CVE-2026-22689) in github.com/axllent/mailpit

Mailpit: WebSocket origin check bypass via percent-encoded path regression of CVE-2026-22689 in github.com/axllent/mailpit...

Double Decoding of the Same Data

Overview fast-uri is a Dependency-free RFC 3986 URI toolbox Affected versions of this package are vulnerable to Double Decoding of the Same Data through hostname normalization in normalize and resolve and the authority recomposition logic in index.js and lib/utils.js. An attacker can redirect an...

CVE-2026-76172

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...

CVE-2026-76172

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...

CVE-2026-76172 fast-uri vulnerable to host confusion via percent-encoded scheme normalization

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...

CVE-2026-76172 fast-uri vulnerable to host confusion via percent-encoded scheme normalization

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...

CVE-2026-67448 Mailpit: WebSocket origin check bypass via percent-encoded path (regression of CVE-2026-22689)

Mailpit is an email testing tool and API for developers. From 1.29.0 until 1.30.6, Mailpit's server/server.go origin middleware checks the raw RequestURI for the /api/ prefix while Go's ServeMux routes using the percent-decoded URL path, and server/websockets/client.go configures...

CVE-2026-67448 Mailpit: WebSocket origin check bypass via percent-encoded path (regression of CVE-2026-22689)

Mailpit is an email testing tool and API for developers. From 1.29.0 until 1.30.6, Mailpit's server/server.go origin middleware checks the raw RequestURI for the /api/ prefix while Go's ServeMux routes using the percent-decoded URL path, and server/websockets/client.go configures...

CVE-2026-67448 Mailpit: WebSocket origin check bypass via percent-encoded path (regression of CVE-2026-22689)

Mailpit is an email testing tool and API for developers. From 1.29.0 until 1.30.6, Mailpit's server/server.go origin middleware checks the raw RequestURI for the /api/ prefix while Go's ServeMux routes using the percent-decoded URL path, and server/websockets/client.go configures...

CVE-2026-73259

Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can send a crafted percent-encoded request path to a deployment using MGENABLEDIRLIST and persuade a user to visit it. The mghttpservedir and listdir path in src/http.c places the decoded request URI into the...

CVE-2026-73259 Mongoose: Reflected XSS via decoded URI in directory listing render

Mongoose is an embedded web server and network library. Prior to 7.22, a remote attacker can send a crafted percent-encoded request path to a deployment using MGENABLEDIRLIST and persuade a user to visit it. The mghttpservedir and listdir path in src/http.c places the decoded request URI into the...