CWE-93
Improper Neutralization of CRLF Sequences ('CRLF Injection')
Description
The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
Hierarchy (View 1000)
Related attack patterns (CAPEC)
CAPEC-15 · CAPEC-81
CVEs mapped to this weakness (213)
page 6 of 11| CVE | Vendor / Product | Sev | Risk | CVSS | EPSS | KEV | Published | Description |
|---|---|---|---|---|---|---|---|---|
| CVE-2026-1536 | Med | 0.38 | 5.8 | 0.00 | Jan 28, 2026 | A flaw was found in libsoup. An attacker who can control the input for the Content-Disposition header can inject CRLF (Carriage Return Line Feed) sequences into the header value. These sequences are then interpreted verbatim when the HTTP request or response is constructed,… | ||
| CVE-2026-1467 | Med | 0.38 | 5.8 | 0.00 | Jan 27, 2026 | A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-decoded input used to create the Host header. A remote attacker can… | ||
| CVE-2025-57804 | Med | 0.38 | — | 0.02 | Aug 25, 2025 | h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to… | ||
| CVE-2023-34472 | Med | 0.37 | 5.7 | 0.00 | Jul 5, 2023 | AMI SPx contains a vulnerability in the BMC where an Attacker may cause an improper neutralization of CRLF sequences in HTTP Headers. A successful exploit of this vulnerability may lead to a loss of integrity. | ||
| CVE-2020-11078 | Med | 0.37 | 6.8 | 0.03 | May 20, 2020 | In httplib2 before version 0.18.0, an attacker controlling unescaped part of uri for `httplib2.Http.request()` could change request headers and body, send additional hidden requests to same server. This vulnerability impacts software that uses httplib2 with uri constructed by… | ||
| CVE-2026-59919 | Med | 0.36 | 5.5 | 0.00 | Jul 29, 2026 | Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's HAProxy encoder ( HAProxyMessageEncoder ) writes AF_UNIX source and destination socket addresses into the HAProxy V1 text protocol without… | ||
| CVE-2026-35504 | Med | 0.36 | 5.5 | 0.00 | May 12, 2026 | PowerSYSTEM Center email notification service is affected by a CRLF injection vulnerability when using SMTPS communication. | ||
| CVE-2026-44217 | Med | 0.36 | — | 0.00 | May 12, 2026 | sse-channel is an SSE-implementation which can be used to any node.js http request/response stream. Prior to 4.0.1, implementations that allow user-provided values to be passed to event, retry or id fields are susceptible to event spoofing, where an attacker could inject… | ||
| CVE-2026-2717 | Med | 0.36 | 5.5 | 0.00 | Apr 22, 2026 | The HTTP Headers plugin for WordPress is vulnerable to CRLF Injection in all versions up to, and including, 1.19.2. This is due to insufficient sanitization of custom header name and value fields before writing them to the Apache .htaccess file via `insert_with_markers()`. This… | ||
| CVE-2024-50405 | Med | 0.36 | 5.5 | 0.00 | Mar 7, 2025 | An improper neutralization of CRLF sequences ('CRLF Injection') vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow remote attackers who have gained administrator access to modify application data. We… | ||
| CVE-2026-71311 | Med | 0.35 | 6.4 | 0.00 | Aug 5, 2026 | rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.0, a valid but nondefault FTP filename encoding in backend/ftp/ftp.go can restore raw CR/LF immediately before an attacker-controlled path is interpolated… | ||
| CVE-2026-45070 | Med | 0.35 | 6.5 | 0.00 | Jul 14, 2026 | Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\Component\Mime\Header\ParameterizedHeader validates and encodes parameter values but emits parameter names verbatim, allowing a… | ||
| CVE-2026-46719 | Med | 0.35 | 6.5 | 0.00 | May 16, 2026 | Net::Statsd::Lite versions before 0.9.0 for Perl allowed metric injections. The metric names were not checked for newlines, colons or pipes. Metrics generated from untrusted sources could inject additional statsd metrics. | ||
| CVE-2025-67735 | Med | 0.35 | 6.5 | 0.00 | Dec 16, 2025 | Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.129.Final and 4.2.8.Final, the `io.netty.handler.codec.http.HttpRequestEncoder` has a CRLF injection with the request URI when constructing a request. This leads to request smuggling… | ||
| CVE-2024-51981 | Med | 0.35 | 5.3 | 0.01 | Jun 25, 2025 | An unauthenticated attacker may perform a blind server side request forgery (SSRF), due to a CLRF injection issue that can be leveraged to perform HTTP request smuggling. This SSRF leverages the WS-Addressing feature used during a WS-Eventing subscription SOAP operation. The… | ||
| CVE-2025-25184 | Med | 0.35 | 6.5 | 0.01 | Feb 12, 2025 | Rack provides an interface for developing web applications in Ruby. Prior to versions 2.2.11, 3.0.12, and 3.1.10, Rack::CommonLogger can be exploited by crafting input that includes newline characters to manipulate log entries. The supplied proof-of-concept demonstrates… | ||
| CVE-2024-40324 | Med | 0.35 | 5.4 | 0.01 | Jul 25, 2024 | A CRLF injection vulnerability in E-Staff v5.1 allows attackers to insert Carriage Return (CR) and Line Feed (LF) characters into input fields, leading to HTTP response splitting and header manipulation. | ||
| CVE-2023-26148 | Med | 0.35 | 5.4 | 0.00 | Sep 29, 2023 | All versions of the package ithewei/libhv are vulnerable to CRLF Injection when untrusted user input is used to set request headers. An attacker can add the \r\n (carriage return line feeds) characters and inject additional headers in the request sent. | ||
| CVE-2023-26138 | Med | 0.35 | 5.4 | 0.00 | Jul 6, 2023 | All versions of the package drogonframework/drogon are vulnerable to CRLF Injection when untrusted user input is used to set request headers in the addHeader function. An attacker can add the \r\n (carriage return line feeds) characters and inject additional headers in the… | ||
| CVE-2023-23936 | Med | 0.35 | 6.5 | 0.01 | Feb 16, 2023 | Undici is an HTTP/1.1 client for Node.js. Starting with version 2.0.0 and prior to version 5.19.1, the undici library does not protect `host` HTTP header from CRLF injection vulnerabilities. This issue is patched in Undici v5.19.1. As a workaround, sanitize the `headers.host`… |
- risk 0.38cvss 5.8epss 0.00
A flaw was found in libsoup. An attacker who can control the input for the Content-Disposition header can inject CRLF (Carriage Return Line Feed) sequences into the header value. These sequences are then interpreted verbatim when the HTTP request or response is constructed,…
- risk 0.38cvss 5.8epss 0.00
A flaw was found in libsoup, an HTTP client library. This vulnerability, known as CRLF (Carriage Return Line Feed) Injection, occurs when an HTTP proxy is configured and the library improperly handles URL-decoded input used to create the Host header. A remote attacker can…
- risk 0.38cvss —epss 0.02
h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to…
- risk 0.37cvss 5.7epss 0.00
AMI SPx contains a vulnerability in the BMC where an Attacker may cause an improper neutralization of CRLF sequences in HTTP Headers. A successful exploit of this vulnerability may lead to a loss of integrity.
- risk 0.37cvss 6.8epss 0.03
In httplib2 before version 0.18.0, an attacker controlling unescaped part of uri for `httplib2.Http.request()` could change request headers and body, send additional hidden requests to same server. This vulnerability impacts software that uses httplib2 with uri constructed by…
- risk 0.36cvss 5.5epss 0.00
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's HAProxy encoder ( HAProxyMessageEncoder ) writes AF_UNIX source and destination socket addresses into the HAProxy V1 text protocol without…
- risk 0.36cvss 5.5epss 0.00
PowerSYSTEM Center email notification service is affected by a CRLF injection vulnerability when using SMTPS communication.
- risk 0.36cvss —epss 0.00
sse-channel is an SSE-implementation which can be used to any node.js http request/response stream. Prior to 4.0.1, implementations that allow user-provided values to be passed to event, retry or id fields are susceptible to event spoofing, where an attacker could inject…
- risk 0.36cvss 5.5epss 0.00
The HTTP Headers plugin for WordPress is vulnerable to CRLF Injection in all versions up to, and including, 1.19.2. This is due to insufficient sanitization of custom header name and value fields before writing them to the Apache .htaccess file via `insert_with_markers()`. This…
- risk 0.36cvss 5.5epss 0.00
An improper neutralization of CRLF sequences ('CRLF Injection') vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow remote attackers who have gained administrator access to modify application data. We…
- risk 0.35cvss 6.4epss 0.00
rclone is a command-line program to sync files and directories to and from different cloud storage providers. Prior to 1.75.0, a valid but nondefault FTP filename encoding in backend/ftp/ftp.go can restore raw CR/LF immediately before an attacker-controlled path is interpolated…
- risk 0.35cvss 6.5epss 0.00
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\Component\Mime\Header\ParameterizedHeader validates and encodes parameter values but emits parameter names verbatim, allowing a…
- risk 0.35cvss 6.5epss 0.00
Net::Statsd::Lite versions before 0.9.0 for Perl allowed metric injections. The metric names were not checked for newlines, colons or pipes. Metrics generated from untrusted sources could inject additional statsd metrics.
- risk 0.35cvss 6.5epss 0.00
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.129.Final and 4.2.8.Final, the `io.netty.handler.codec.http.HttpRequestEncoder` has a CRLF injection with the request URI when constructing a request. This leads to request smuggling…
- risk 0.35cvss 5.3epss 0.01
An unauthenticated attacker may perform a blind server side request forgery (SSRF), due to a CLRF injection issue that can be leveraged to perform HTTP request smuggling. This SSRF leverages the WS-Addressing feature used during a WS-Eventing subscription SOAP operation. The…
- risk 0.35cvss 6.5epss 0.01
Rack provides an interface for developing web applications in Ruby. Prior to versions 2.2.11, 3.0.12, and 3.1.10, Rack::CommonLogger can be exploited by crafting input that includes newline characters to manipulate log entries. The supplied proof-of-concept demonstrates…
- risk 0.35cvss 5.4epss 0.01
A CRLF injection vulnerability in E-Staff v5.1 allows attackers to insert Carriage Return (CR) and Line Feed (LF) characters into input fields, leading to HTTP response splitting and header manipulation.
- risk 0.35cvss 5.4epss 0.00
All versions of the package ithewei/libhv are vulnerable to CRLF Injection when untrusted user input is used to set request headers. An attacker can add the \r\n (carriage return line feeds) characters and inject additional headers in the request sent.
- risk 0.35cvss 5.4epss 0.00
All versions of the package drogonframework/drogon are vulnerable to CRLF Injection when untrusted user input is used to set request headers in the addHeader function. An attacker can add the \r\n (carriage return line feeds) characters and inject additional headers in the…
- risk 0.35cvss 6.5epss 0.01
Undici is an HTTP/1.1 client for Node.js. Starting with version 2.0.0 and prior to version 5.19.1, the undici library does not protect `host` HTTP header from CRLF injection vulnerabilities. This issue is patched in Undici v5.19.1. As a workaround, sanitize the `headers.host`…