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.
616 vulnerabilities reference this CWE, most recent first.
CVE-2026-67182 (GCVE-0-2026-67182)
Vulnerability from cvelistv5 – Published: 2026-07-28 16:18 – Updated: 2026-07-28 17:10 X_Open Source
VLAI
EPSS
VEX
Title
Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header Injection
Summary
Rouille 0.3.3 through 3.6.2 contains an HTTP request smuggling vulnerability that allows remote attackers to bypass access controls by injecting bare line feed characters (0x0A) into client-supplied request header values that are copied verbatim to upstream connections without validation. Attackers can craft a header value containing a complete additional HTTP request that is interpreted as a separate request by backends such as Go net/http and Python http.server, causing the backend to process a smuggled request with attacker-chosen method, path, and headers that bypasses the rouille handler's access control logic.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 17:08 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/theopaid/HTTP-Request-Smugglin… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/rouille-http… | third-party-advisory |
Impacted products
Date Public
2026-07-26 00:00
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CVE-2026-67181 (GCVE-0-2026-67181)
Vulnerability from cvelistv5 – Published: 2026-07-28 16:10 – Updated: 2026-07-28 16:35 X_Open Source
VLAI
EPSS
VEX
Title
Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Transfer-Encoding Header
Summary
Rouille 0.3.3 through 3.6.2 contains an HTTP request smuggling vulnerability that allows remote attackers to desynchronize HTTP message boundaries by exploiting improper header forwarding in the proxy implementation. The proxy in src/proxy.rs forwards the client's Transfer-Encoding header to upstream backends unchanged while transmitting a body already de-chunked by tiny_http, enabling CL.TE desynchronization attacks where attackers control where the backend believes the request body ends.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 16:35 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/theopaid/HTTP-Request-Smugglin… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/rouille-http… | third-party-advisory |
Impacted products
Date Public
2026-07-26 00:00
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CVE-2026-66752 (GCVE-0-2026-66752)
Vulnerability from cvelistv5 – Published: 2026-07-28 15:44 – Updated: 2026-08-14 16:50 X_Open Source
VLAI
EPSS
VEX
Title
tiny-http 0.12.0 HTTP Request Smuggling via Transfer-Encoding Handling
Summary
tiny-http through 0.12.0 contains an HTTP request smuggling vulnerability that allows remote attackers to desynchronize request framing by sending a Transfer-Encoding header with any value, including non-chunked codings, which causes the library to unconditionally apply chunk-decoding and discard Content-Length. Attackers can exploit the discrepancy between tiny_http's improper Transfer-Encoding parsing and a correctly-implemented front-end proxy to produce two distinct interpretations of a single byte stream, enabling request smuggling, and can additionally send non-chunked bodies with non-chunked Transfer-Encoding values to cause failed body reads that tie up connections and consume worker threads without signaling errors to clients.
Severity
5.4 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 17:31 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/theopaid/HTTP-Request-Smugglin… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/tiny-http-ht… | third-party-advisory |
Impacted products
Date Public
2026-07-26 00:00
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CVE-2026-66338 (GCVE-0-2026-66338)
Vulnerability from cvelistv5 – Published: 2026-07-24 23:01 – Updated: 2026-07-27 14:35
VLAI
EPSS
VEX
Title
Libsoup: libsoup: http request smuggling via permissive chunk-size parsing in soup_body_input_stream_read_chunked()
Summary
A flaw was found in libsoup. The chunked transfer encoding parser uses a permissive parsing function for chunk sizes that silently accepts inputs violating RFC 9112, including leading whitespace, plus sign prefixes, and trailing invalid characters. When libsoup operates behind a strict frontend proxy, this parsing differential can be exploited to smuggle HTTP requests.
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 14:34 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-66338 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2506950 | issue-trackingx_refsource_REDHAT |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
Date Public
2026-06-05 00:00
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CVE-2026-63385 (GCVE-0-2026-63385)
Vulnerability from cvelistv5 – Published: 2026-08-20 17:55 – Updated: 2026-08-21 21:46
VLAI
EPSS
VEX
Title
Libevent: HTTP header handling bugs create risk of access control bypass.
Summary
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has two HTTP parsing weaknesses in http.c. evhttp_decode_uri_internal decodes percent-encoded %00 bytes into literal NUL characters, which can cause downstream C string operations to truncate a path and bypass validation performed on a different representation. evhttp_header_is_valid_value also accepts obsolete line folding in header values containing carriage return or line feed characters, allowing a proxy and libevent to interpret headers differently and enabling header injection or access control bypass. The CRLF header acceptance is fixed in versions 2.1.13 and 2.2.2-alpha, but the reviewed patches do not clearly remediate the URI NUL-truncation condition.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 20:58 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/libevent/libevent/security/adv… | x_refsource_CONFIRM |
| https://github.com/libevent/libevent/commit/758be… | x_refsource_MISC |
| https://github.com/libevent/libevent/commit/9170d… | x_refsource_MISC |
| https://github.com/libevent/libevent/releases/tag… | x_refsource_MISC |
| https://github.com/libevent/libevent/releases/tag… | x_refsource_MISC |
Impacted products
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CVE-2026-63382 (GCVE-0-2026-63382)
Vulnerability from cvelistv5 – Published: 2026-08-20 17:51 – Updated: 2026-08-20 19:33
VLAI
EPSS
VEX
Title
libevent evhttp: Multiple HTTP Parser Bugs Enable Request Smuggling
Summary
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, the libevent evhttp parser in http.c inconsistently handles duplicate Transfer-Encoding headers, comma-separated Transfer-Encoding values, and bare line feeds in chunked framing. evhttp_find_header can select only the first header, evhttp_check_transfer_encoding_ was absent so the previous whole-string comparison fails to recognize valid lists ending in chunked, and evhttp_handle_chunked_read uses EVBUFFER_EOL_CRLF rather than EVBUFFER_EOL_CRLF_STRICT, accepting bare LF chunk terminators. When libevent is deployed behind a proxy that frames the same request differently, an unauthenticated remote attacker can desynchronize request boundaries and smuggle a second request, potentially bypassing access controls or poisoning caches. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 19:33 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/libevent/libevent/security/adv… | x_refsource_CONFIRM |
| https://github.com/libevent/libevent/commit/10abb… | x_refsource_MISC |
| https://github.com/libevent/libevent/commit/5119c… | x_refsource_MISC |
| https://github.com/libevent/libevent/commit/83ba6… | x_refsource_MISC |
| https://github.com/libevent/libevent/commit/ac387… | x_refsource_MISC |
| https://github.com/libevent/libevent/releases/tag… | x_refsource_MISC |
| https://github.com/libevent/libevent/releases/tag… | x_refsource_MISC |
Impacted products
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CVE-2026-63379 (GCVE-0-2026-63379)
Vulnerability from cvelistv5 – Published: 2026-08-20 17:55 – Updated: 2026-08-25 15:14
VLAI
EPSS
VEX
Title
Libevent: HTTP Header smuggling
Summary
Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req->input_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 15:14 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/libevent/libevent/security/adv… | x_refsource_CONFIRM |
| https://github.com/libevent/libevent/commit/87e8e… | x_refsource_MISC |
| https://github.com/libevent/libevent/commit/b8470… | x_refsource_MISC |
| https://github.com/libevent/libevent/releases/tag… | x_refsource_MISC |
| https://github.com/libevent/libevent/releases/tag… | x_refsource_MISC |
Impacted products
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CVE-2026-62899 (GCVE-0-2026-62899)
Vulnerability from cvelistv5 – Published: 2026-08-11 17:04 – Updated: 2026-08-29 16:22
VLAI
EPSS
VEX
Title
.NET Security Feature Bypass Vulnerability
Summary
Inconsistent interpretation of http requests ('http request/response smuggling') in .NET allows an unauthorized attacker to bypass a security feature over a network.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 13:48 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | .NET 10.0 |
Affected:
10.0.0 , < 10.0.11
(custom)
|
|
| Microsoft | .NET 8.0 |
Affected:
8.0.0 , < 8.0.30
(custom)
|
|
| Microsoft | .NET 9.0 |
Affected:
9.0.0 , < 9.0.19
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2022 version 17.14 |
Affected:
17.14.0 , < 17.14.38
(custom)
|
|
| Microsoft | Microsoft Visual Studio 2026 version 18.8 |
Affected:
18.0 , < 18.8.3
(custom)
|
Date Public
2026-08-11 14:00
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CVE-2026-59900 (GCVE-0-2026-59900)
Vulnerability from cvelistv5 – Published: 2026-07-29 17:58 – Updated: 2026-07-29 18:07
VLAI
EPSS
VEX
Title
Netty codec-http2: Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads to Request Routing Bypass
Summary
Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, Netty's HTTP/2-to-HTTP/1.x translation layer (`Http2StreamFrameToHttpObjectCodec` and `InboundHttp2ToHttpAdapter`) fails to deduplicate or validate `Host` headers when an HTTP/2 client supplies both the `:authority` pseudo-header and a literal `host` header in a single HEADERS frame. The translator maps `:authority` to `Host` and separately copies the literal `host` header, producing an `HttpRequest` object containing two `Host` headers with attacker-controlled differing values. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-29 18:07 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/netty/netty/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/netty/netty/releases/tag/netty… | x_refsource_MISC |
| https://github.com/netty/netty/releases/tag/netty… | x_refsource_MISC |
Impacted products
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CVE-2026-59898 (GCVE-0-2026-59898)
Vulnerability from cvelistv5 – Published: 2026-07-29 18:02 – Updated: 2026-07-30 15:19
VLAI
EPSS
VEX
Title
Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation
Summary
Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, ab attacker can force WebSocket upgrade via the lax V07 (or V08) handshaker by sending `Sec-WebSocket-Version: 7` and omitting `Connection: Upgrade` / `Upgrade: websocket` headers, completing a protocol switch that a proxy would not recognize as an Upgrade request and enabling HTTP request smuggling / protocol-confusion attacks. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-30 13:55 UTC
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/netty/netty/security/advisorie… | x_refsource_CONFIRM |
| https://github.com/netty/netty/releases/tag/netty… | x_refsource_MISC |
| https://github.com/netty/netty/releases/tag/netty… | x_refsource_MISC |
Impacted products
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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.