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 8 of 11| CVE | Vendor / Product | Sev | Risk | CVSS | EPSS | KEV | Published | Description |
|---|---|---|---|---|---|---|---|---|
| CVE-2026-47242 | Med | 0.31 | — | 0.00 | Jun 22, 2026 | Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, when Net::IMAP#id is called with a hash argument, although the ID field value strings are correctly quoted (escaping quoted specials), they were not validated to… | ||
| CVE-2026-47240 | Med | 0.31 | — | 0.00 | Jun 22, 2026 | Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a "raw data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not… | ||
| CVE-2026-9679 | Med | 0.31 | 5.9 | 0.00 | Jun 17, 2026 | Impact: undici's cookie parser in parseSetCookie percent-decodes cookie values via qsUnescape, turning encoded sequences like %0D%0A, %00, %3B, and %3D into their literal byte equivalents. RFC 6265 §5.4 does not specify any decoding and browsers do not decode either. … | ||
| CVE-2026-44214 | Med | 0.31 | 5.8 | 0.00 | May 26, 2026 | eventsource-encoder encodes events as well-formed EventSource/Server Sent Event (SSE) messages. Prior to 1.0.2, eventsource-encoder does not sanitize the event or id fields of an EventSourceMessage before serializing them. An attacker who controls either field can inject… | ||
| CVE-2020-3561 | Med | 0.31 | 4.7 | 0.01 | Oct 21, 2020 | A vulnerability in the Clientless SSL VPN (WebVPN) of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to inject arbitrary HTTP headers in the responses of the affected system. The… | ||
| CVE-2026-59921 | Med | 0.30 | 5.7 | 0.00 | Jul 28, 2026 | Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, HttpPostRequestEncoder constructs multipart HTTP request bodies by directly concatenating user-supplied filenames and field names into Content-Disposition MIME… | ||
| CVE-2026-1502 | Med | 0.30 | — | 0.01 | Apr 10, 2026 | CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host. | ||
| CVE-2025-11468 | Med | 0.30 | — | 0.01 | Jan 20, 2026 | When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized. | ||
| CVE-2025-59419 | Med | 0.29 | — | 0.02 | Oct 15, 2025 | Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.128.Final and 4.2.7.Final, the SMTP codec in Netty contains an SMTP command injection vulnerability due to insufficient input validation for Carriage Return (\r) and Line Feed (\n)… | ||
| CVE-2026-42258 | Med | 0.28 | 5.3 | 0.01 | May 9, 2026 | Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This… | ||
| CVE-2026-2400 | Med | 0.28 | 4.3 | 0.00 | Apr 14, 2026 | CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability exists that could cause application user credentials to reset when a Web Admin user alters the POST /setPCBEDesc request payload. | ||
| CVE-2026-3234 | Med | 0.28 | 4.3 | 0.00 | Mar 12, 2026 | A flaw was found in mod_proxy_cluster. This vulnerability, a Carriage Return Line Feed (CRLF) injection in the decodeenc() function, allows a remote attacker to bypass input validation. By injecting CRLF sequences into the cluster configuration, an attacker can corrupt the… | ||
| CVE-2026-30227 | Med | 0.28 | 5.3 | 0.01 | Mar 6, 2026 | MimeKit is a C# library which may be used for the creation and parsing of messages using the Multipurpose Internet Mail Extension (MIME), as defined by numerous IETF specifications. Prior to version 4.15.1, a CRLF injection vulnerability in MimeKit allows an attacker to embed… | ||
| CVE-2026-28296 | Med | 0.28 | 4.3 | 0.00 | Feb 26, 2026 | A flaw was found in the FTP GVfs backend. A remote attacker could exploit this input validation vulnerability by supplying specially crafted file paths containing carriage return and line feed (CRLF) sequences. These unsanitized sequences allow the attacker to terminate intended… | ||
| CVE-2026-23829 | Med | 0.28 | 5.3 | 0.01 | Jan 19, 2026 | Mailpit is an email testing tool and API for developers. Prior to version 1.28.3, Mailpit's SMTP server is vulnerable to Header Injection due to an insufficient Regular Expression used to validate `RCPT TO` and `MAIL FROM` addresses. An attacker can inject arbitrary SMTP headers… | ||
| CVE-2025-14531 | Med | 0.28 | 4.3 | 0.00 | Dec 11, 2025 | A vulnerability was found in code-projects Rental Management System 2.0. This affects an unknown function of the file Transaction.java of the component Log Handler. Performing manipulation results in crlf injection. The attack can be initiated remotely. The exploit has been made… | ||
| CVE-2025-54972 | Med | 0.28 | 4.3 | 0.00 | Nov 18, 2025 | An improper neutralization of crlf sequences ('crlf injection') vulnerability in Fortinet FortiMail 7.6.0 through 7.6.3, FortiMail 7.4.0 through 7.4.5, FortiMail 7.2 all versions, FortiMail 7.0 all versions may allow an attacker to inject headers in the response via convincing a… | ||
| CVE-2023-49082 | Med | 0.28 | 5.3 | 0.01 | Nov 29, 2023 | aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation makes it possible for an attacker to modify the HTTP request (e.g. insert a new header) or even create a new HTTP request if the attacker controls the HTTP method. The… | ||
| CVE-2022-35948 | Med | 0.28 | 5.3 | 0.02 | Aug 15, 2022 | undici is an HTTP/1.1 client, written from scratch for Node.js.`=< [email protected]` users are vulnerable to _CRLF Injection_ on headers when using unsanitized input as request headers, more specifically, inside the `content-type` header. Example: ``` import { request } from… | ||
| CVE-2022-31150 | Med | 0.28 | 5.3 | 0.01 | Jul 19, 2022 | undici is an HTTP/1.1 client, written from scratch for Node.js. It is possible to inject CRLF sequences into request headers in undici in versions less than 5.7.1. A fix was released in version 5.8.0. Sanitizing all HTTP headers from untrusted sources to eliminate `\r\n` is a… |
- risk 0.31cvss —epss 0.00
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, when Net::IMAP#id is called with a hash argument, although the ID field value strings are correctly quoted (escaping quoted specials), they were not validated to…
- risk 0.31cvss —epss 0.00
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a "raw data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not…
- risk 0.31cvss 5.9epss 0.00
Impact: undici's cookie parser in parseSetCookie percent-decodes cookie values via qsUnescape, turning encoded sequences like %0D%0A, %00, %3B, and %3D into their literal byte equivalents. RFC 6265 §5.4 does not specify any decoding and browsers do not decode either. …
- risk 0.31cvss 5.8epss 0.00
eventsource-encoder encodes events as well-formed EventSource/Server Sent Event (SSE) messages. Prior to 1.0.2, eventsource-encoder does not sanitize the event or id fields of an EventSourceMessage before serializing them. An attacker who controls either field can inject…
- risk 0.31cvss 4.7epss 0.01
A vulnerability in the Clientless SSL VPN (WebVPN) of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to inject arbitrary HTTP headers in the responses of the affected system. The…
- risk 0.30cvss 5.7epss 0.00
Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, HttpPostRequestEncoder constructs multipart HTTP request bodies by directly concatenating user-supplied filenames and field names into Content-Disposition MIME…
- risk 0.30cvss —epss 0.01
CR/LF bytes were not rejected by HTTP client proxy tunnel headers or host.
- risk 0.30cvss —epss 0.01
When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.
- risk 0.29cvss —epss 0.02
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.128.Final and 4.2.7.Final, the SMTP codec in Netty contains an SMTP command injection vulnerability due to insufficient input validation for Carriage Return (\r) and Line Feed (\n)…
- risk 0.28cvss 5.3epss 0.01
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This…
- risk 0.28cvss 4.3epss 0.00
CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability exists that could cause application user credentials to reset when a Web Admin user alters the POST /setPCBEDesc request payload.
- risk 0.28cvss 4.3epss 0.00
A flaw was found in mod_proxy_cluster. This vulnerability, a Carriage Return Line Feed (CRLF) injection in the decodeenc() function, allows a remote attacker to bypass input validation. By injecting CRLF sequences into the cluster configuration, an attacker can corrupt the…
- risk 0.28cvss 5.3epss 0.01
MimeKit is a C# library which may be used for the creation and parsing of messages using the Multipurpose Internet Mail Extension (MIME), as defined by numerous IETF specifications. Prior to version 4.15.1, a CRLF injection vulnerability in MimeKit allows an attacker to embed…
- risk 0.28cvss 4.3epss 0.00
A flaw was found in the FTP GVfs backend. A remote attacker could exploit this input validation vulnerability by supplying specially crafted file paths containing carriage return and line feed (CRLF) sequences. These unsanitized sequences allow the attacker to terminate intended…
- risk 0.28cvss 5.3epss 0.01
Mailpit is an email testing tool and API for developers. Prior to version 1.28.3, Mailpit's SMTP server is vulnerable to Header Injection due to an insufficient Regular Expression used to validate `RCPT TO` and `MAIL FROM` addresses. An attacker can inject arbitrary SMTP headers…
- risk 0.28cvss 4.3epss 0.00
A vulnerability was found in code-projects Rental Management System 2.0. This affects an unknown function of the file Transaction.java of the component Log Handler. Performing manipulation results in crlf injection. The attack can be initiated remotely. The exploit has been made…
- risk 0.28cvss 4.3epss 0.00
An improper neutralization of crlf sequences ('crlf injection') vulnerability in Fortinet FortiMail 7.6.0 through 7.6.3, FortiMail 7.4.0 through 7.4.5, FortiMail 7.2 all versions, FortiMail 7.0 all versions may allow an attacker to inject headers in the response via convincing a…
- risk 0.28cvss 5.3epss 0.01
aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation makes it possible for an attacker to modify the HTTP request (e.g. insert a new header) or even create a new HTTP request if the attacker controls the HTTP method. The…
- risk 0.28cvss 5.3epss 0.02
undici is an HTTP/1.1 client, written from scratch for Node.js.`=< [email protected]` users are vulnerable to _CRLF Injection_ on headers when using unsanitized input as request headers, more specifically, inside the `content-type` header. Example: ``` import { request } from…
- risk 0.28cvss 5.3epss 0.01
undici is an HTTP/1.1 client, written from scratch for Node.js. It is possible to inject CRLF sequences into request headers in undici in versions less than 5.7.1. A fix was released in version 5.8.0. Sanitizing all HTTP headers from untrusted sources to eliminate `\r\n` is a…