Common Weakness Enumeration
CWE-444
AllowedInconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Abstraction: Base · Status: Incomplete
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
607 vulnerabilities reference this CWE, most recent first.
CVE-2026-1525 (GCVE-0-2026-1525)
Vulnerability from cvelistv5 – Published: 2026-03-12 19:56 – Updated: 2026-03-12 20:46
VLAI
EPSS
VEX
Title
undici is vulnerable to Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Summary
Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names (e.g., Content-Length and content-length). This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire.
Who is impacted:
* Applications using undici.request(), undici.Client, or similar low-level APIs with headers passed as flat arrays
* Applications that accept user-controlled header names without case-normalization
Potential consequences:
* Denial of Service: Strict HTTP parsers (proxies, servers) will reject requests with duplicate Content-Length headers (400 Bad Request)
* HTTP Request Smuggling: In deployments where an intermediary and backend interpret duplicate headers inconsistently (e.g., one uses the first value, the other uses the last), this can enable request smuggling attacks leading to ACL bypass, cache poisoning, or credential hijacking
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-12 20:44 UTC
CWE
- CWE-444 - Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling')
Assigner
References
Impacted products
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CVE-2026-1491 (GCVE-0-2026-1491)
Vulnerability from cvelistv5 – Published: 2026-04-01 20:44 – Updated: 2026-04-08 00:18
VLAI
EPSS
VEX
Title
Security Vulnerabilities have been found in IBM Verify Identity Access and IBM Security Verify Access
Summary
IBM Verify Identity Access Container 11.0 through 11.0.2 and IBM Security Verify Access Container 10.0 through 10.0.9.1 and IBM Verify Identity Access 11.0 through 11.0.2 and IBM Security Verify Access 10.0 through 10.0.9.1 IBM Security Verify could allow a remote attacker to access sensitive information due to an inconsistent interpretation of an HTTP request by a reverse proxy.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-03 13:45 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7268253 | vendor-advisorypatch |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | Verify Identity Access Container |
Affected:
11.0 , ≤ 11.0.2
(semver)
cpe:2.3:a:ibm:verify_identity_access_container:11.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:verify_identity_access_container:11.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:verify_identity_access_container:11.0.2:*:*:*:*:*:*:* |
|
| IBM | Security Verify Access Container |
Affected:
10.0 , ≤ 10.0.9.1
(semver)
cpe:2.3:a:ibm:security_verify_access_container:10.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:security_verify_access_container:10.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:security_verify_access_container:10.0.9.1:*:*:*:*:*:*:* |
|
| IBM | Verify Identity Access |
Affected:
11.0 , ≤ 11.0.2
(semver)
cpe:2.3:a:ibm:verify_identity_access:11.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:verify_identity_access:11.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:verify_identity_access:11.0.2:*:*:*:*:*:*:* |
|
| IBM | Security Verify Access |
Affected:
10.0 , ≤ 10.0.9.1
(semver)
cpe:2.3:a:ibm:security_verify_access:10.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:security_verify_access:10.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:security_verify_access:10.0.9.1:*:*:*:*:*:*:* |
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CVE-2026-1002 (GCVE-0-2026-1002)
Vulnerability from cvelistv5 – Published: 2026-01-15 20:50 – Updated: 2026-01-15 21:09
VLAI
EPSS
VEX
Title
Eclipse Vert.x Web static handler file access denial
Summary
The Vert.x Web static handler component cache can be manipulated to deny the access to static files served by the handler using specifically crafted request URI.
The issue comes from an improper implementation of the C. rule of section 5.2.4 of RFC3986 and is fixed in Vert.x Core component (used by Vert.x Web): https://github.com/eclipse-vertx/vert.x/pull/5895
Steps to reproduce
Given a file served by the static handler, craft an URI that introduces a string like bar%2F..%2F after the last / char to deny the access to the URI with an HTTP 404 response. For example https://example.com/foo/index.html can be denied with https://example.com/foo/bar%2F..%2Findex.html
Mitgation
Disabling Static Handler cache fixes the issue.
StaticHandler staticHandler = StaticHandler.create().setCachingEnabled(false);
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-15 21:07 UTC
CWE
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Eclipse Vert.x | Eclipse Vert.x |
Affected:
4.0.0 , ≤ 4.5.23
(semver)
Affected: 5.0.0 , ≤ 5.0.6 (semver) |
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CVE-2025-69225 (GCVE-0-2025-69225)
Vulnerability from cvelistv5 – Published: 2026-01-05 23:16 – Updated: 2026-01-06 19:02
VLAI
EPSS
VEX
Title
AIOHTTP Regex Mismatch Allows Unicode in ASCII-Only Protocol Fields
Summary
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below contain parser logic which allows non-ASCII decimals to be present in the Range header. There is no known impact, but there is the possibility that there's a method to exploit a request smuggling vulnerability. This issue is fixed in version 3.13.3.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-06 14:25 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
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CVE-2025-69224 (GCVE-0-2025-69224)
Vulnerability from cvelistv5 – Published: 2026-01-05 22:35 – Updated: 2026-01-06 19:03
VLAI
EPSS
VEX
Title
AIOHTTP's Unicode processing of header values could cause parsing discrepancies
Summary
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below of the Python HTTP parser may allow a request smuggling attack with the presence of non-ASCII characters. If a pure Python version of AIOHTTP is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. This issue is fixed in version 3.13.3.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-06 14:25 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
2 references
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CVE-2025-65114 (GCVE-0-2025-65114)
Vulnerability from cvelistv5 – Published: 2026-04-02 15:55 – Updated: 2026-04-02 18:10
VLAI
EPSS
VEX
Title
Apache Traffic Server: Malformed chunked message body allows request smuggling
Summary
Apache Traffic Server allows request smuggling if chunked messages are malformed.
This issue affects Apache Traffic Server: from 9.0.0 through 9.2.12, from 10.0.0 through 10.1.1.
Users are recommended to upgrade to version 9.2.13 or 10.1.2, which fix the issue.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-02 18:09 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/2s11roxlv1j8ph6q5… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Traffic Server |
Affected:
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(semver)
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CVE-2025-59822 (GCVE-0-2025-59822)
Vulnerability from cvelistv5 – Published: 2025-09-23 18:54 – Updated: 2025-09-23 19:17
VLAI
EPSS
VEX
Title
Http4s vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section
Summary
Http4s is a Scala interface for HTTP services. In versions from 1.0.0-M1 to before 1.0.0-M45 and before 0.23.31, http4s is vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section. This vulnerability could enable attackers to bypass front-end servers security controls, launch targeted attacks against active users, and poison web caches. A pre-requisite for exploitation involves the web application being deployed behind a reverse-proxy that forwards trailer headers. This issue has been patched in versions 1.0.0-M45 and 0.23.31.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-23 19:15 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/http4s/http4s/security/advisor… | x_refsource_CONFIRM |
| https://github.com/http4s/http4s/commit/dd518f7c9… | x_refsource_MISC |
Impacted products
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CVE-2025-58068 (GCVE-0-2025-58068)
Vulnerability from cvelistv5 – Published: 2025-08-29 21:12 – Updated: 2025-11-03 18:13
VLAI
EPSS
VEX
Title
Eventlet affected by HTTP request smuggling in unparsed trailers
Summary
Eventlet is a concurrent networking library for Python. Prior to version 0.40.3, the Eventlet WSGI parser is vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer sections. This vulnerability could enable attackers to, bypass front-end security controls, launch targeted attacks against active site users, and poison web caches. This problem has been patched in Eventlet 0.40.3 by dropping trailers which is a breaking change if a backend behind eventlet.wsgi proxy requires trailers. A workaround involves not using eventlet.wsgi facing untrusted clients.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-02 13:49 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/eventlet/eventlet/security/adv… | x_refsource_CONFIRM |
| https://github.com/eventlet/eventlet/pull/1062 | x_refsource_MISC |
| https://github.com/eventlet/eventlet/commit/0bfeb… | x_refsource_MISC |
| https://lists.debian.org/debian-lts-announce/2025… |
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CVE-2025-58056 (GCVE-0-2025-58056)
Vulnerability from cvelistv5 – Published: 2025-09-03 20:56 – Updated: 2025-09-05 18:41
VLAI
EPSS
VEX
Title
Netty is vulnerable to request smuggling due to incorrect parsing of chunk extensions
Summary
Netty is an asynchronous event-driven network application framework for development of maintainable high performance protocol servers and clients. In versions 4.1.124.Final, and 4.2.0.Alpha3 through 4.2.4.Final, Netty incorrectly accepts standalone newline characters (LF) as a chunk-size line terminator, regardless of a preceding carriage return (CR), instead of requiring CRLF per HTTP/1.1 standards. When combined with reverse proxies that parse LF differently (treating it as part of the chunk extension), attackers can craft requests that the proxy sees as one request but Netty processes as two, enabling request smuggling attacks. This is fixed in versions 4.1.125.Final and 4.2.5.Final.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-04 19:09 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/netty/netty/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/JLLeitschuh/unCVEed/issues/1 | x_refsource_MISC |
| https://github.com/netty/netty/issues/15522 | x_refsource_MISC |
| https://github.com/netty/netty/pull/15611 | x_refsource_MISC |
| https://github.com/netty/netty/commit/edb55fd8e0a… | x_refsource_MISC |
| https://datatracker.ietf.org/doc/html/rfc9112#nam… | x_refsource_MISC |
| https://w4ke.info/2025/06/18/funky-chunks.html | x_refsource_MISC |
Impacted products
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CVE-2025-55315 (GCVE-0-2025-55315)
Vulnerability from cvelistv5 – Published: 2025-10-14 17:00 – Updated: 2026-02-22 17:24
VLAI
EPSS
VEX
Title
ASP.NET Security Feature Bypass Vulnerability
Summary
Inconsistent interpretation of http requests ('http request/response smuggling') in ASP.NET Core allows an authorized attacker to bypass a security feature over a network.
Severity
9.9 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-28 12:57 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
| https://gist.github.com/N3mes1s/d0897c13ca199e739… | exploit |
| https://andrewlock.net/understanding-the-worst-do… |
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | ASP.NET Core 2.3 |
Affected:
2.3 , < 2.3.6
(custom)
|
|
| Microsoft | ASP.NET Core 8.0 |
Affected:
8.0 , < 8.0.21
(custom)
|
|
| Microsoft | ASP.NET Core 9.0 |
Affected:
9.0 , < 9.0.10
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2022 version 17.10 |
Affected:
17.10.0 , < 17.10.20
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2022 version 17.12 |
Affected:
17.12.0 , < 17.12.13
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2022 version 17.14 |
Affected:
17.14.0 , < 17.14.17
(custom)
|
Date Public
2025-10-14 14:00
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"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:*:*:*",
"versionEndExcluding": "17.14.17",
"versionStartIncluding": "17.14.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"datePublic": "2025-10-14T14:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": "Inconsistent interpretation of http requests (\u0027http request/response smuggling\u0027) in ASP.NET Core allows an authorized attacker to bypass a security feature over a network."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.9,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en-US",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-444",
"description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
"lang": "en-US",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-02-22T17:24:12.183Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"name": "ASP.NET Security Feature Bypass Vulnerability",
"tags": [
"vendor-advisory",
"patch"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55315"
}
],
"title": "ASP.NET Security Feature Bypass Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2025-55315",
"datePublished": "2025-10-14T17:00:10.371Z",
"dateReserved": "2025-08-12T20:19:59.422Z",
"dateUpdated": "2026-02-22T17:24:12.183Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Mitigation
Implementation
Use a web server that employs a strict HTTP parsing procedure, such as Apache [REF-433].
Mitigation
Implementation
Use only SSL communication.
Mitigation
Implementation
Terminate the client session after each request.
Mitigation
System Configuration
Turn all pages to non-cacheable.
CAPEC-273: HTTP Response Smuggling
An adversary manipulates and injects malicious content in the form of secret unauthorized HTTP responses, into a single HTTP response from a vulnerable or compromised back-end HTTP agent (e.g., server).
See CanPrecede relationships for possible consequences.
CAPEC-33: HTTP Request Smuggling
An adversary abuses the flexibility and discrepancies in the parsing and interpretation of HTTP Request messages using various HTTP headers, request-line and body parameters as well as message sizes (denoted by the end of message signaled by a given HTTP header) by different intermediary HTTP agents (e.g., load balancer, reverse proxy, web caching proxies, application firewalls, etc.) to secretly send unauthorized and malicious HTTP requests to a back-end HTTP agent (e.g., web server).
See CanPrecede relationships for possible consequences.