CWE-177
Improper Handling of URL Encoding (Hex Encoding)
Description
The product does not properly handle when all or part of an input has been URL encoded.
Hierarchy (View 1000)
Parents
Children
none
Related attack patterns (CAPEC)
CAPEC-120 · CAPEC-468 · CAPEC-64 · CAPEC-72
CVEs mapped to this weakness (18)
| CVE | Vendor / Product | Sev | Risk | CVSS | EPSS | KEV | Published | Description |
|---|---|---|---|---|---|---|---|---|
| CVE-2026-15371 | Hig | 0.53 | 8.1 | 0.00 | Aug 18, 2026 | Velociraptor's web GUI allows specifying a custom type for columns in tables. The URL type takes the cell value and forms a URL which can be clicked in the GUI.The code does not limit the schemes allowed in this URL , allowing an attacker to specify a JavaScript scheme exposing… | ||
| CVE-2022-3782 | Cri | 0.53 | 9.1 | 0.06 | Jan 13, 2023 | keycloak: path traversal via double URL encoding. A flaw was found in Keycloak, where it does not properly validate URLs included in a redirect. An attacker can use this flaw to construct a malicious request to bypass validation and access other URLs and potentially sensitive… | ||
| CVE-2025-29847 | Hig | 0.49 | 7.5 | 0.01 | Jan 19, 2026 | A vulnerability in Apache Linkis. Problem Description When using the JDBC engine and da When using the JDBC engine and data source functionality, if the URL parameter configured on the frontend has undergone multiple rounds of URL encoding, it may bypass the system's checks.… | ||
| CVE-2022-27780 | Hig | 0.49 | 7.5 | 0.02 | Jun 2, 2022 | The curl URL parser wrongly accepts percent-encoded URL separators like '/'when decoding the host name part of a URL, making it a *different* URL usingthe wrong host name when it is later retrieved.For example, a URL like `http://example.com%2F127.0.0.1/`, would be allowed bythe… | ||
| CVE-2026-22037 | Hig | 0.48 | 8.4 | 0.00 | Jan 19, 2026 | The @fastify/express plugin adds full Express compatibility to Fastify. A security vulnerability exists in @fastify/express prior to version 4.0.3 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., `/%61dmin` instead of… | ||
| CVE-2026-22031 | Hig | 0.48 | 8.4 | 0.01 | Jan 19, 2026 | @fastify/middie is the plugin that adds middleware support on steroids to Fastify. A security vulnerability exists in @fastify/middie prior to version 9.1.0 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., `/%61dmin`… | ||
| CVE-2026-76172 | Hig | 0.42 | 7.5 | 0.00 | Aug 24, 2026 | 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… | ||
| CVE-2026-29045 | Hig | 0.42 | 7.5 | 0.01 | Mar 4, 2026 | Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using serveStatic together with route-based middleware protections (e.g. app.use('/admin/*', ...)), inconsistent URL decoding allowed protected static resources to… | ||
| CVE-2022-3854 | Med | 0.42 | 6.5 | 0.01 | Mar 6, 2023 | A flaw was found in Ceph, relating to the URL processing on RGW backends. An attacker can exploit the URL processing by providing a null URL to crash the RGW, causing a denial of service. | ||
| CVE-2024-23983 | Med | 0.38 | — | 0.00 | Nov 11, 2024 | Improper handling of canonical URL-encoding may lead to bypass not properly constrained by request rules. | ||
| CVE-2026-67448 | Med | 0.35 | 6.5 | 0.00 | Aug 20, 2026 | 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… | ||
| CVE-2018-3718 | Med | 0.35 | 5.3 | 0.01 | Jun 7, 2018 | serve node module suffers from Improper Handling of URL Encoding by permitting access to ignored files if a filename is URL encoded. | ||
| CVE-2024-48866 | Med | 0.34 | 5.3 | 0.00 | Dec 6, 2024 | An improper handling of URL encoding (Hex Encoding) vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow remote attackers to run the system into unexpected state. We have already fixed the vulnerability in… | ||
| CVE-2026-6414 | Med | 0.31 | 5.9 | 0.00 | Apr 16, 2026 | @fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem resolution, while Fastify's router treats them as literal characters. This mismatch allows attackers to bypass route-based middleware or guards that protect files served… | ||
| CVE-2023-47106 | Med | 0.24 | 4.8 | 0.01 | Dec 4, 2023 | Traefik is an open source HTTP reverse proxy and load balancer. When a request is sent to Traefik with a URL fragment, Traefik automatically URL encodes and forwards the fragment to the backend server. This violates RFC 7230 because in the origin-form the URL should only contain… | ||
| CVE-2025-11990 | Low | 0.20 | 3.1 | 0.00 | Nov 15, 2025 | GitLab has remediated an issue in GitLab EE affecting all versions from 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated user to gain CSRF tokens by exploiting improper input validation in repository references combined with redirect handling… | ||
| CVE-2026-59083 | Cri | 0.00 | 9.1 | 0.00 | Jul 14, 2026 | Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through… | ||
| CVE-2026-41041 | Cri | 0.00 | 9.1 | 0.01 | Jul 13, 2026 | URL path injection via unencoded user-supplied identifiers vulnerability in Apache Gravitino. This issue affects Apache Gravitino: from 1.0.0 before 1.2.1. Users are recommended to upgrade to version 1.2.1, which fixes the issue. |
- risk 0.53cvss 8.1epss 0.00
Velociraptor's web GUI allows specifying a custom type for columns in tables. The URL type takes the cell value and forms a URL which can be clicked in the GUI.The code does not limit the schemes allowed in this URL , allowing an attacker to specify a JavaScript scheme exposing…
- risk 0.53cvss 9.1epss 0.06
keycloak: path traversal via double URL encoding. A flaw was found in Keycloak, where it does not properly validate URLs included in a redirect. An attacker can use this flaw to construct a malicious request to bypass validation and access other URLs and potentially sensitive…
- risk 0.49cvss 7.5epss 0.01
A vulnerability in Apache Linkis. Problem Description When using the JDBC engine and da When using the JDBC engine and data source functionality, if the URL parameter configured on the frontend has undergone multiple rounds of URL encoding, it may bypass the system's checks.…
- risk 0.49cvss 7.5epss 0.02
The curl URL parser wrongly accepts percent-encoded URL separators like '/'when decoding the host name part of a URL, making it a *different* URL usingthe wrong host name when it is later retrieved.For example, a URL like `http://example.com%2F127.0.0.1/`, would be allowed bythe…
- risk 0.48cvss 8.4epss 0.00
The @fastify/express plugin adds full Express compatibility to Fastify. A security vulnerability exists in @fastify/express prior to version 4.0.3 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., `/%61dmin` instead of…
- risk 0.48cvss 8.4epss 0.01
@fastify/middie is the plugin that adds middleware support on steroids to Fastify. A security vulnerability exists in @fastify/middie prior to version 9.1.0 where middleware registered with a specific path prefix can be bypassed using URL-encoded characters (e.g., `/%61dmin`…
- risk 0.42cvss 7.5epss 0.00
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…
- risk 0.42cvss 7.5epss 0.01
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to version 4.12.4, when using serveStatic together with route-based middleware protections (e.g. app.use('/admin/*', ...)), inconsistent URL decoding allowed protected static resources to…
- risk 0.42cvss 6.5epss 0.01
A flaw was found in Ceph, relating to the URL processing on RGW backends. An attacker can exploit the URL processing by providing a null URL to crash the RGW, causing a denial of service.
- risk 0.38cvss —epss 0.00
Improper handling of canonical URL-encoding may lead to bypass not properly constrained by request rules.
- risk 0.35cvss 6.5epss 0.00
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…
- risk 0.35cvss 5.3epss 0.01
serve node module suffers from Improper Handling of URL Encoding by permitting access to ignored files if a filename is URL encoded.
- risk 0.34cvss 5.3epss 0.00
An improper handling of URL encoding (Hex Encoding) vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow remote attackers to run the system into unexpected state. We have already fixed the vulnerability in…
- risk 0.31cvss 5.9epss 0.00
@fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem resolution, while Fastify's router treats them as literal characters. This mismatch allows attackers to bypass route-based middleware or guards that protect files served…
- risk 0.24cvss 4.8epss 0.01
Traefik is an open source HTTP reverse proxy and load balancer. When a request is sent to Traefik with a URL fragment, Traefik automatically URL encodes and forwards the fragment to the backend server. This violates RFC 7230 because in the origin-form the URL should only contain…
- risk 0.20cvss 3.1epss 0.00
GitLab has remediated an issue in GitLab EE affecting all versions from 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated user to gain CSRF tokens by exploiting improper input validation in repository references combined with redirect handling…
- risk 0.00cvss 9.1epss 0.00
Improper Handling of URL Encoding (Hex Encoding) vulnerability in Apache Tomcat's rewrite valve allowed security constraint bypass for some configurations. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.23, from 10.1.0-M1 through 10.1.56, from 9.0.0.M1 through…
- risk 0.00cvss 9.1epss 0.01
URL path injection via unencoded user-supplied identifiers vulnerability in Apache Gravitino. This issue affects Apache Gravitino: from 1.0.0 before 1.2.1. Users are recommended to upgrade to version 1.2.1, which fixes the issue.