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CWE-444
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
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.
CVE-2026-52845 (GCVE-0-2026-52845)
Vulnerability from cvelistv5 – Published: 2026-06-23 17:52 – Updated: 2026-06-24 14:26
VLAI
Title
Caddy: FastCGI header normalization bypass in `forward_auth copy_headers`
Summary
Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, forward_auth copy_headers deletes the exact client-supplied identity header before copying the trusted value from the auth gateway. But when the request later goes through php_fastcgi, Caddy normalizes HTTP headers into CGI variables by replacing - with _. This lets a client send an underscore alias that survives the forward_auth delete step but becomes the same PHP/FastCGI variable. Result: a remote client can inject or sometimes override identity/group headers trusted by PHP/FastCGI applications behind Caddy. This vulnerability is fixed in 2.11.4.
Severity
8.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/caddyserver/caddy/security/adv… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| caddyserver | caddy |
Affected:
< 2.11.4
|
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CVE-2026-53538 (GCVE-0-2026-53538)
Vulnerability from cvelistv5 – Published: 2026-06-22 16:56 – Updated: 2026-06-23 16:08
VLAI
Title
Python-Multipart: Semicolon treated as querystring field separator enables parameter smuggling
Summary
Python-Multipart is a streaming multipart parser for Python. Prior to 0.0.30, QuerystringParser treated ; as a field separator in application/x-www-form-urlencoded bodies, in addition to &. The WHATWG URL standard, modern browsers, and Python's urllib.parse (since the CVE-2021-23336 fix) treat only & as a separator. This creates a parser differential: the same bytes are tokenized into different fields than a WHATWG compliant intermediary would produce, allowing an attacker to smuggle extra form fields past an upstream body inspecting component. This vulnerability is fixed in 0.0.30.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/Kludex/python-multipart/securi… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kludex | python-multipart |
Affected:
< 0.0.30
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CVE-2026-54387 (GCVE-0-2026-54387)
Vulnerability from cvelistv5 – Published: 2026-06-17 19:48 – Updated: 2026-06-23 16:16 X_Open Source
VLAI
Title
Tinyproxy - HTTP Request Smuggling via CL/TE Desynchronization
Summary
Tinyproxy through 1.11.3, fixed in commit ff45d3b, fails to reconcile conflicting Content-Length and Transfer-Encoding: chunked headers, forwarding both verbatim to the backend while using Content-Length to determine how many request body bytes to consume. Remote attackers can desynchronize the proxy and backend parser state, allowing injection of arbitrary HTTP requests to the backend to enable cache poisoning, access control bypass, and request hijacking.
Severity
9.1 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/tinyproxy/tinyproxy/issues/609 | issue-tracking |
| https://github.com/tinyproxy/tinyproxy/pull/610 | issue-tracking |
| https://github.com/tinyproxy/tinyproxy/commit/ff4… | patch |
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Impacted products
Date Public
2026-05-07 00:00
Credits
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CVE-2026-54388 (GCVE-0-2026-54388)
Vulnerability from cvelistv5 – Published: 2026-06-17 19:59 – Updated: 2026-06-23 16:16 X_Open Source
VLAI
Title
Tinyproxy - HTTP Request Smuggling via Duplicate Content-Length Headers
Summary
Tinyproxy through 1.11.3, fixed in commit 364cdb6, fails to reject requests containing multiple Content-Length headers with differing values, forwarding all duplicate headers to the backend while using the first value to determine how many request body bytes to consume. Remote attackers can desynchronize the proxy and backend parser state, allowing injection of arbitrary HTTP requests to the backend to enable cache poisoning, access control bypass, and request hijacking.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/tinyproxy/tinyproxy/issues/609 | issue-tracking |
| https://github.com/tinyproxy/tinyproxy/pull/610 | issue-tracking |
| https://github.com/tinyproxy/tinyproxy/commit/364… | patch |
| https://www.vulncheck.com/advisories/tinyproxy-ht… | third-party-advisory |
Impacted products
Date Public
2026-05-07 00:00
Credits
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CVE-2026-6324 (GCVE-0-2026-6324)
Vulnerability from cvelistv5 – Published: 2026-05-29 05:24 – Updated: 2026-05-29 14:01
VLAI
Title
Libsoup: libsoup: http request smuggling via unsigned to signed conversion error
Summary
A flaw was found in libsoup. A remote attacker could exploit an unsigned to signed conversion error in the `soup_body_input_stream_read_chunked()` function by sending a malicious HTTP request. This vulnerability occurs when libsoup operates behind a non-libsoup proxy server or as a proxy in front of a non-libsoup backend server. Successful exploitation can allow an attacker to bypass security controls, poison web caches, or gain unauthorized access.
Severity
4.8 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-6324 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2458479 | issue-trackingx_refsource_REDHAT |
| https://gitlab.gnome.org/GNOME/libsoup/-/issues/508 | |
| https://gitlab.gnome.org/GNOME/libsoup/-/work_items/508 | exploit |
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
2026-01-27 00:00
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CVE-2026-6338 (GCVE-0-2026-6338)
Vulnerability from cvelistv5 – Published: 2026-06-11 13:47 – Updated: 2026-06-11 14:23
VLAI
Title
HTTP request smuggling in Kong Enteprise Gateway
Summary
A HTTP request smuggling and desynchronization vulnerability affects Kong Gateway Enterprise 3.4, 3.10, 3.11, 3.12, 3.13, and 3.14 series. The vulnerability is caused by a parsing flaw in Kong’s HTTP request processing pipeline when handling untrusted HTTP/1.1 traffic.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-444 - Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://support.konghq.com/support/s/article/CVE-… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Kong | Kong Enterprise Gateway |
Affected:
3.4.0.0 , < 3.4.3.27
(kong enteprise gateway 3.4)
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CVE-2026-8620 (GCVE-0-2026-8620)
Vulnerability from cvelistv5 – Published: 2026-05-26 17:15 – Updated: 2026-05-27 13:12
VLAI
Title
IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities when using when using Web Server Plug-ins
Summary
IBM Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty 8.5, 9.0 IBM WebSphere Application Server and WebSphere Application Server Liberty are vulnerable to HTTP request smuggling in the Web Server Plug-ins through a specially crafted request.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
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/7274072 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | Web Server Plug-ins for WebSphere Application Server and WebSphere Liberty |
Affected:
8.5, 9.0 , ≤ Interim Fix 002
(semver)
cpe:2.3:a:ibm:web_server_plug_ins_for_websphere_application_server_and_websphere_liberty:8.5:*:*:*:*:*:*:* cpe:2.3:a:ibm:web_server_plug_ins_for_websphere_application_server_and_websphere_liberty:8.5.0:*:*:*:*:*:*:* |
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CVE-2026-8646 (GCVE-0-2026-8646)
Vulnerability from cvelistv5 – Published: 2026-06-22 14:44 – Updated: 2026-06-24 03:56
VLAI
Title
IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by multiple vulnerabilities
Summary
IBM WebSphere Application Server 9.0 and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are vulnerable to HTTP request smuggling. A remote attacker could smuggle a specially crafted request to the application server thereby allowing the attacker to bypass security controls, spoof identity, escalate privilege, and expose sensitive information.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
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/7276579 | vendor-advisorypatch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | WebSphere Application Server |
Affected:
9.0.0 , ≤ 7.0.2 Interim Fix 035
(semver)
Affected: 8.5.0 , ≤ 7.0.3 Interim Fix 017 (semver) cpe:2.3:a:ibm:websphere_application_server:9.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:websphere_application_server:9.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:websphere_application_server:8.5:*:*:*:*:*:*:* cpe:2.3:a:ibm:websphere_application_server:8.5.0:*:*:*:*:*:*:* |
|
| IBM | WebSphere Application Server - Liberty |
Affected:
17.0.0.3 , ≤ 26.0.0.6
(semver)
cpe:2.3:a:ibm:websphere_application_server___liberty:17.0.0.3:*:*:*:*:*:*:* cpe:2.3:a:ibm:websphere_application_server___liberty:26.0.0.6:*:*:*:*:*:*:* |
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Mitigation
Phase: Implementation
Description:
- Use a web server that employs a strict HTTP parsing procedure, such as Apache [REF-433].
Mitigation
Phase: Implementation
Description:
- Use only SSL communication.
Mitigation
Phase: Implementation
Description:
- Terminate the client session after each request.
Mitigation
Phase: System Configuration
Description:
- 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.']