CWE-174
Double Decoding of the Same Data
The product decodes the same input twice, which can limit the effectiveness of any protection mechanism that occurs in between the decoding operations.
CVE-2026-109955 (GCVE-0-2026-109955)
Vulnerability from cvelistv5
Published
2026-10-13 13:27
Modified
2026-10-13 13:51
Severity ?
6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
VLAI Severity ?
EPSS score ?
CWE
- CWE-174 - Double Decoding of the Same Data
Summary
Hono from 4.12.4 before 4.13.11 contains a middleware bypass vulnerability in serveStatic that allows unauthenticated attackers to skip prefix middleware by exploiting double path decoding. Attackers can send malformed percent-encoded paths that the router matches in encoded form, reaching static files without authentication checks running.
References
| URL | Tags | |
|---|---|---|
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CVE-2026-111757 (GCVE-0-2026-111757)
Vulnerability from cvelistv5
Published
2026-10-19 17:31
Modified
2026-10-20 16:10
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-174 - Double Decoding of the Same Data
Summary
Hono is a Web application framework that provides support for any JavaScript runtime. From 4.12.4 until 4.13.11, serveStatic can interpret a malformed percent-encoded path differently from upstream routing middleware and bypass protection for a static prefix. The root cause is serveStatic decodes a routed request path a second time before filesystem lookup. The attack mechanism is malformed percent encoding survives the first routing interpretation and becomes a protected path only during the later static-file decode. The affected component is serveStatic. The trigger conditions are an application protects a static prefix with upstream middleware and serveStatic receives an attacker-controlled malformed percent-encoded path. The impact is unauthorized disclosure of a static file that upstream middleware was intended to protect. The issue does not permit traversal outside the configured static root. This issue is fixed in version 4.13.11.
References
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CVE-2026-75899 (GCVE-0-2026-75899)
Vulnerability from cvelistv5
Published
2026-08-24 09:40
Modified
2026-08-24 16:19
Severity ?
VLAI Severity ?
EPSS score ?
Summary
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.
References
Impacted products
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CVE-2026-92839 (GCVE-0-2026-92839)
Vulnerability from cvelistv5
Published
2026-09-17 03:53
Modified
2026-09-17 12:59
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-174 - Double decoding of the same data
Summary
Canva Desktop before v1.125.0 performed double decoding in the deeplink handler. A threat actor could cause the application to load arbitrary same-origin content under the user’s session.
References
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CVE-2026-93903 (GCVE-0-2026-93903)
Vulnerability from cvelistv5
Published
2026-09-30 13:44
Modified
2026-09-30 16:30
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-174 - Double Decoding of the Same Data
Summary
LiteSpeed Web Server (LSWS) before 6.3.7 build 1 mishandles internal redirect URL validation in a certain "corner case."
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| litespeedtech | LiteSpeed Web Server |
Version: 0 < 6.3.7 build 1 |
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Mitigation ID: MIT-44
Phase: Architecture and Design
Strategy: Input Validation
Description:
- Avoid making decisions based on names of resources (e.g. files) if those resources can have alternate names.
Mitigation ID: MIT-5
Phase: Implementation
Strategy: Input Validation
Description:
- Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
- When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
- Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
Mitigation ID: MIT-30
Phase: Implementation
Strategy: Output Encoding
Description:
- Use and specify an output encoding that can be handled by the downstream component that is reading the output. Common encodings include ISO-8859-1, UTF-7, and UTF-8. When an encoding is not specified, a downstream component may choose a different encoding, either by assuming a default encoding or automatically inferring which encoding is being used, which can be erroneous. When the encodings are inconsistent, the downstream component might treat some character or byte sequences as special, even if they are not special in the original encoding. Attackers might then be able to exploit this discrepancy and conduct injection attacks; they even might be able to bypass protection mechanisms that assume the original encoding is also being used by the downstream component.
Mitigation ID: MIT-20
Phase: Implementation
Strategy: Input Validation
Description:
- Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
No CAPEC attack patterns related to this CWE.