CWE-113
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers.
CVE-2025-53007 (GCVE-0-2025-53007)
Vulnerability from cvelistv5 – Published: 2025-06-26 14:45 – Updated: 2025-06-27 16:09
VLAI
Title
arduino-esp32 vulnerable to CRLF injection in WebServer.cpp
Summary
arduino-esp32 provides an Arduino core for the ESP32. Versions prior to 3.3.0-RC1 and 3.2.1 contain a HTTP Response Splitting vulnerability. The `sendHeader` function takes arbitrary input for the HTTP header name and value, concatenates them into an HTTP header line, and appends this to the outgoing HTTP response headers. There is no validation or sanitization of the `name` or `value` parameters before they are included in the HTTP response. If an attacker can control the input to `sendHeader` (either directly or indirectly), they could inject carriage return (`\r`) or line feed (`\n`) characters into either the header name or value. This could allow the attacker to inject additional headers, manipulate the structure of the HTTP response, potentially inject an entire new HTTP response (HTTP Response Splitting), and/or ause header confusion or other HTTP protocol attacks. Versions 3.3.0-RC1 and 3.2.1 contain a fix for the issue.
Severity
CWE
- CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/espressif/arduino-esp32/securi… | x_refsource_CONFIRM |
| https://github.com/espressif/arduino-esp32/commit… | x_refsource_MISC |
| https://github.com/espressif/arduino-esp32/blob/9… | x_refsource_MISC |
| https://github.com/espressif/arduino-esp32/blob/9… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| espressif | arduino-esp32 |
Affected:
< 3.2.1
Affected: >= 3.3.0-alpha1, < 3.3.0-RC1 |
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CVE-2025-53094 (GCVE-0-2025-53094)
Vulnerability from cvelistv5 – Published: 2025-06-27 19:57 – Updated: 2025-06-27 20:19
VLAI
Title
ESPAsyncWebServer Vulnerable to CRLF Injection in AsyncWebHeader.cpp
Summary
ESPAsyncWebServer is an asynchronous HTTP and WebSocket server library for ESP32, ESP8266, RP2040 and RP2350. In versions up to and including 3.7.8, a CRLF (Carriage Return Line Feed) injection vulnerability exists in the construction and output of HTTP headers within `AsyncWebHeader.cpp`. Unsanitized input allows attackers to inject CR (`\r`) or LF (`\n`) characters into header names or values, leading to arbitrary header or response manipulation. Manipulation of HTTP headers and responses can enable a wide range of attacks, making the severity of this vulnerability high. A fix is available at pull request 211 and is expected to be part of version 3.7.9.
Severity
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/ESP32Async/ESPAsyncWebServer/s… | x_refsource_CONFIRM |
| https://github.com/ESP32Async/ESPAsyncWebServer/p… | x_refsource_MISC |
| https://github.com/ESP32Async/ESPAsyncWebServer/b… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ESP32Async | ESPAsyncWebServer |
Affected:
<= 3.7.8
|
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CVE-2025-55271 (GCVE-0-2025-55271)
Vulnerability from cvelistv5 – Published: 2026-03-26 12:59 – Updated: 2026-03-26 15:01
VLAI
Title
HCL Aftermarket DPC is affected by HTTP Response Splitting vulnerability
Summary
HCL Aftermarket DPC is affected by HTTP Response Splitting vulnerability where in depending on how the web application handles the split response, an attacker may be able to execute arbitrary commands or inject harmful content into the response..
Severity
CWE
- CWE-113 - Improper Control of HTTP Messages and Headers
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| HCL | Aftermarket DPC |
Affected:
version 1.0.0
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CVE-2025-59151 (GCVE-0-2025-59151)
Vulnerability from cvelistv5 – Published: 2025-10-27 19:42 – Updated: 2025-10-27 20:24
VLAI
Title
Pi-hole Admin Interface vulnerable to HTTP response header injection via CRLF injection
Summary
Pi-hole Admin Interface is a web interface for managing Pi-hole, a network-level advertisement and internet tracker blocking application. Pi-hole Admin Interface before 6.3 is vulnerable to Carriage Return Line Feed (CRLF) injection. When a request is made to a file ending with the .lp extension, the application performs a redirect without properly sanitizing the input. An attacker can inject carriage return and line feed characters (%0d%0a) to manipulate both the headers and the content of the HTTP response. This enables the injection of arbitrary HTTP response headers, potentially leading to session fixation, cache poisoning, and the weakening or bypassing of browser-based security mechanisms such as Content Security Policy or X-XSS-Protection. This vulnerability is fixed in 6.3.
Severity
8.2 (High)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
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CVE-2025-61689 (GCVE-0-2025-61689)
Vulnerability from cvelistv5 – Published: 2025-10-10 16:48 – Updated: 2025-10-10 19:12
VLAI
Title
HTTP.jl vulnerable to Header injection/Response splitting via header construction.
Summary
HTTP.jl is an HTTP client and server functionality for the Julia programming language. Prior to version 1.10.19, HTTP.jl did not validate header names/values for illegal characters, allowing CRLF-based header injection and response splitting. This enables HTTP response splitting and header injection, leading to cache poisoning, XSS, session fixation, and more. This issue is fixed in HTTP.jl `v1.10.19`.
Severity
CWE
- CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/JuliaWeb/HTTP.jl/security/advi… | x_refsource_CONFIRM |
| https://github.com/JuliaWeb/HTTP.jl/releases/tag/… | x_refsource_MISC |
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CVE-2026-22779 (GCVE-0-2026-22779)
Vulnerability from cvelistv5 – Published: 2026-01-14 16:49 – Updated: 2026-01-14 21:01
VLAI
Title
BlackSheep ClientSession is vulnerable to CRLF injection
Summary
BlackSheep is an asynchronous web framework to build event based web applications with Python. Prior to 2.4.6, the HTTP Client implementation in BlackSheep is vulnerable to CRLF injection. Missing headers validation makes it possible for an attacker to modify the HTTP requests (e.g. insert a new header) or even create a new HTTP request. Exploitation requires developers to pass unsanitized user input directly into headers.The server part is not affected because BlackSheep delegates to an underlying ASGI server handling of response headers. This vulnerability is fixed in 2.4.6.
Severity
CWE
- CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Neoteroi/BlackSheep/security/a… | x_refsource_CONFIRM |
| https://github.com/Neoteroi/BlackSheep/commit/bd4… | x_refsource_MISC |
| https://github.com/Neoteroi/BlackSheep/releases/t… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Neoteroi | BlackSheep |
Affected:
< 2.4.6
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CVE-2026-23686 (GCVE-0-2026-23686)
Vulnerability from cvelistv5 – Published: 2026-02-10 03:02 – Updated: 2026-02-10 17:19
VLAI
Title
CRLF Injection vulnerability in SAP NetWeaver Application Server Java
Summary
Due to a CRLF Injection vulnerability in SAP NetWeaver Application Server Java, an authenticated attacker with administrative access could submit specially crafted content to the application. If processed by the application, this content enables injection of untrusted entries into generated configuration, allowing manipulation of application-controlled settings. Successful exploitation leads to a low impact on integrity, while confidentiality and availability remain unaffected.
Severity
CWE
- CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SAP_SE | SAP NetWeaver Application Server Java |
Affected:
LMNWABASICAPPS 7.50
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CVE-2026-24320 (GCVE-0-2026-24320)
Vulnerability from cvelistv5 – Published: 2026-02-10 03:03 – Updated: 2026-02-10 16:25
VLAI
Title
Memory Corruption vulnerability in SAP NetWeaver and ABAP Platform (Application Server ABAP)
Summary
Due to improper memory management in SAP NetWeaver and ABAP Platform (Application Server ABAP), an authenticated attacker could exploit logical errors in memory management by supplying specially crafted input containing unique characters, which are improperly converted. This may result in memory corruption and the potential leakage of memory content. Successful exploitation of this vulnerability would have a low impact on the confidentiality of the application, with no effect on its integrity or availability.
Severity
CWE
- CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SAP_SE | SAP NetWeaver and ABAP Platform (Application Server ABAP) |
Affected:
KRNL64NUC 7.22
Affected: 7.22EXT Affected: KRNL64UC 7.22 Affected: 7.53 Affected: 8.04 Affected: KERNEL 7.22 Affected: 7.54 Affected: 7.77 Affected: 7.89 Affected: 7.93 Affected: 9.16 Affected: 9.17 Affected: 9.18 |
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CVE-2026-24489 (GCVE-0-2026-24489)
Vulnerability from cvelistv5 – Published: 2026-01-27 00:36 – Updated: 2026-01-27 14:46
VLAI
Title
Gakido vulnerable to HTTP Header Injection (CRLF Injection)
Summary
Gakido is a Python HTTP client focused on browser impersonation and anti-bot evasion. A vulnerability was discovered in Gakido prior to version 0.1.1 that allowed HTTP header injection through CRLF (Carriage Return Line Feed) sequences in user-supplied header values and names. When making HTTP requests with user-controlled header values containing `\r\n` (CRLF), `\n` (LF), or `\x00` (null byte) characters, an attacker could inject arbitrary HTTP headers into the request. The fix in version 0.1.1 adds a `_sanitize_header()` function that strips `\r`, `\n`, and `\x00` characters from both header names and values before they are included in HTTP requests.
Severity
5.3 (Medium)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/HappyHackingSpace/gakido/secur… | x_refsource_CONFIRM |
| https://github.com/HappyHackingSpace/gakido/commi… | x_refsource_MISC |
| https://github.com/HappyHackingSpace/gakido/relea… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| HappyHackingSpace | gakido |
Affected:
< 0.1.1
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"title": "Gakido vulnerable to HTTP Header Injection (CRLF Injection)"
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CVE-2026-27810 (GCVE-0-2026-27810)
Vulnerability from cvelistv5 – Published: 2026-02-27 19:44 – Updated: 2026-03-02 12:53
VLAI
Title
calibre Vulnerable to HTTP Response Header Injection
Summary
calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to version 9.4.0, an HTTP Response Header Injection vulnerability in the calibre Content Server allows any authenticated user to inject arbitrary HTTP headers into server responses via an unsanitized `content_disposition` query parameter in the `/get/` and `/data-files/get/` endpoints. All users running the calibre Content Server with authentication enabled are affected. The vulnerability is exploitable by any authenticated user and can also be triggered by tricking an authenticated victim into clicking a crafted link. Version 9.4.0 contains a fix for the issue.
Severity
6.4 (Medium)
CWE
- CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/kovidgoyal/calibre/security/ad… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| kovidgoyal | calibre |
Affected:
< 9.4.0
|
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
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Mitigation
Phase: Implementation
Strategy: Input Validation
Description:
- Construct HTTP headers very carefully, avoiding the use of non-validated input data.
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. If an input does not strictly conform to specifications, reject it or transform it into something that conforms.
- 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.
CAPEC-105: HTTP Request Splitting
['An adversary abuses the flexibility and discrepancies in the parsing and interpretation of HTTP Request messages by different intermediary HTTP agents (e.g., load balancer, reverse proxy, web caching proxies, application firewalls, etc.) to split a single HTTP request into multiple unauthorized and malicious HTTP requests to a back-end HTTP agent (e.g., web server).', 'See CanPrecede relationships for possible consequences.']
CAPEC-31: Accessing/Intercepting/Modifying HTTP Cookies
This attack relies on the use of HTTP Cookies to store credentials, state information and other critical data on client systems. There are several different forms of this attack. The first form of this attack involves accessing HTTP Cookies to mine for potentially sensitive data contained therein. The second form involves intercepting this data as it is transmitted from client to server. This intercepted information is then used by the adversary to impersonate the remote user/session. The third form is when the cookie's content is modified by the adversary before it is sent back to the server. Here the adversary seeks to convince the target server to operate on this falsified information.
CAPEC-34: HTTP Response Splitting
['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., web server) or into an already spoofed HTTP response from an adversary controlled domain/site.', 'See CanPrecede relationships for possible consequences.']
CAPEC-85: AJAX Footprinting
This attack utilizes the frequent client-server roundtrips in Ajax conversation to scan a system. While Ajax does not open up new vulnerabilities per se, it does optimize them from an attacker point of view. A common first step for an attacker is to footprint the target environment to understand what attacks will work. Since footprinting relies on enumeration, the conversational pattern of rapid, multiple requests and responses that are typical in Ajax applications enable an attacker to look for many vulnerabilities, well-known ports, network locations and so on. The knowledge gained through Ajax fingerprinting can be used to support other attacks, such as XSS.