Common Weakness Enumeration

CWE-93

Allowed

Improper Neutralization of CRLF Sequences ('CRLF Injection')

Abstraction: Base · Status: Draft

API response cwe.mitre.org

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.

385 vulnerabilities reference this CWE, most recent first.

CVE-2026-3634 (GCVE-0-2026-3634)

Vulnerability from cvelistv5 – Published: 2026-03-17 09:44 – Updated: 2026-03-19 20:55
VLAI
Title
Libsoup: libsoup: http header injection and response splitting via crlf injection in content-type header
Summary
A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the `soup_message_headers_set_content_type()` function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.
Severity
3.9 (Low)
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-17 13:03 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Date Public
2026-03-06 05:05
Credits
Red Hat would like to thank Codean Labs for reporting this issue.
Show details on NVD website
To clipboard 

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CVE-2026-3633 (GCVE-0-2026-3633)

Vulnerability from cvelistv5 – Published: 2026-03-17 09:44 – Updated: 2026-03-19 20:57
VLAI
Title
Libsoup: libsoup: header and http request injection via crlf injection
Summary
A flaw was found in libsoup. A remote attacker, by controlling the method parameter of the `soup_message_new()` function, could inject arbitrary headers and additional request data. This vulnerability, known as CRLF (Carriage Return Line Feed) injection, occurs because the method value is not properly escaped during request line construction, potentially leading to HTTP request injection.
Severity
3.9 (Low)
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-17 12:59 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Date Public
2026-03-06 05:05
Credits
Red Hat would like to thank Codean Labs for reporting this issue.
Show details on NVD website
To clipboard 

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CVE-2026-3234 (GCVE-0-2026-3234)

Vulnerability from cvelistv5 – Published: 2026-03-12 10:54 – Updated: 2026-03-12 13:15
VLAI
Title
Mod_proxy_cluster: mod_proxy_cluster: response body corruption via crlf injection
Summary
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 response body of INFO endpoint responses. Exploitation requires network access to the MCMP protocol port, but no authentication is needed.
Severity
4.3 (Medium)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-12 13:15 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
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https://bugzilla.redhat.com/show_bug.cgi?id=2442889 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
Create a notification for this product.
Red Hat Red Hat JBoss Core Services     cpe:/a:redhat:jboss_core_services:1
Create a notification for this product.
Date Public
2026-02-26 00:00
Credits
Red Hat would like to thank Coty Sutherland (@csutherl) (IBM) for reporting this issue.
Show details on NVD website
To clipboard 

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CVE-2026-2717 (GCVE-0-2026-2717)

Vulnerability from cvelistv5 – Published: 2026-04-22 07:45 – Updated: 2026-04-22 18:29
VLAI
Title
HTTP Headers <= 1.19.2 - Authenticated (Administrator+) CRLF Injection via Custom Header Values
Summary
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 makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary newline characters and additional Apache directives into the .htaccess configuration file via the 'Custom Headers' settings, leading to Apache configuration parse errors and potential site-wide denial of service.
Severity
5.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-22 18:29 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Vendor Product Version
zinoui HTTP Headers Affected: 0 , ≤ 1.19.2 (semver)
Create a notification for this product.
Credits
Kai Aizen
Show details on NVD website
To clipboard 

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CVE-2026-2442 (GCVE-0-2026-2442)

Vulnerability from cvelistv5 – Published: 2026-03-28 09:27 – Updated: 2026-04-08 17:24
VLAI
Title
Pagelayer <= 2.0.7 - Improper Neutralization of CRLF Sequences to Unauthenticated Email Header Injection via 'email'
Summary
The Page Builder: Pagelayer – Drag and Drop website builder plugin for WordPress is vulnerable to Improper Neutralization of CRLF Sequences ('CRLF Injection') in all versions up to, and including, 2.0.7. This is due to the contact form handler performing placeholder substitution on attacker-controlled form fields and then passing the resulting values into email headers without removing CR/LF characters. This makes it possible for unauthenticated attackers to inject arbitrary email headers (for example Bcc / Cc) and abuse form email delivery via the 'email' parameter granted they can target a contact form configured to use placeholders in mail template headers.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-30 18:27 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Credits
Drew Webber
Show details on NVD website
To clipboard 

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CVE-2026-2400 (GCVE-0-2026-2400)

Vulnerability from cvelistv5 – Published: 2026-04-14 15:22 – Updated: 2026-04-14 16:27
VLAI
Summary
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.
Severity
5.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-14 16:23 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-1714 (GCVE-0-2026-1714)

Vulnerability from cvelistv5 – Published: 2026-02-18 04:35 – Updated: 2026-04-08 17:24
VLAI
Title
ShopLentor <= 3.3.2 - Unauthenticated Email Relay Abuse via 'woolentor_suggest_price_action' AJAX Action
Summary
The ShopLentor – WooCommerce Builder for Elementor & Gutenberg +21 Modules – All in One Solution plugin for WordPress is vulnerable to Email Relay Abuse in all versions up to, and including, 3.3.2. This is due to the lack of validation on the 'send_to', 'product_title', 'wlmessage', and 'wlemail' parameters in the 'woolentor_suggest_price_action' AJAX endpoint. This makes it possible for unauthenticated attackers to send arbitrary emails to any recipient with full control over the subject line, message content, and sender address (via CRLF injection in the 'wlemail' parameter), effectively turning the website into a full email relay for spam or phishing campaigns.
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-18 12:26 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Credits
Teerachai Somprasong
Show details on NVD website
To clipboard 

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CVE-2026-1536 (GCVE-0-2026-1536)

Vulnerability from cvelistv5 – Published: 2026-01-28 15:15 – Updated: 2026-03-25 14:21
VLAI
Title
Libsoup: libsoup: http header injection or response splitting via crlf injection in content-disposition header
Summary
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, allowing arbitrary HTTP headers to be injected. This vulnerability can lead to HTTP header injection or HTTP response splitting without requiring authentication or user interaction.
Severity
5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-28 16:10 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Date Public
2026-01-28 00:00
Credits
Red Hat would like to thank Codean Labs for reporting this issue.
Show details on NVD website
To clipboard 

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CVE-2026-1527 (GCVE-0-2026-1527)

Vulnerability from cvelistv5 – Published: 2026-03-12 20:17 – Updated: 2026-03-13 18:06
VLAI
Title
undici is vulnerable to CRLF Injection via upgrade option
Summary
ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to: * Inject arbitrary HTTP headers * Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch) The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters: // lib/dispatcher/client-h1.js:1121 if (upgrade) { header += `connection: upgrade\r\nupgrade: ${upgrade}\r\n` }
Severity
4.6 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-13 18:05 UTC
CWE
  • CWE-93 - Improper neutralization of CRLF sequences ('CRLF injection')
Assigner
References
Impacted products
Vendor Product Version
undici undici Affected: < 6.24.0; 7.0.0 < 7.24.0
Unaffected: 6.24.0: 7.24.0
Create a notification for this product.
Credits
Matteo Collina Ulises Gascón Raul Vega del Valle
Show details on NVD website
To clipboard 

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CVE-2026-1467 (GCVE-0-2026-1467)

Vulnerability from cvelistv5 – Published: 2026-01-27 09:17 – Updated: 2026-03-25 14:34
VLAI
Title
Libsoup: libsoup: http header injection via specially crafted urls when an http proxy is configured
Summary
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 exploit this by providing a specially crafted URL containing CRLF sequences, allowing them to inject additional HTTP headers or complete HTTP request bodies. This can lead to unintended or unauthorized HTTP requests being forwarded by the proxy, potentially impacting downstream services.
Severity
5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-27 16:54 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Date Public
2026-01-27 00:00
Credits
Red Hat would like to thank Codean Labs for reporting this issue.
Show details on NVD website
To clipboard 

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Mitigation
Implementation

Avoid using CRLF as a special sequence.

Mitigation
Implementation

Appropriately filter or quote CRLF sequences in user-controlled input.

CAPEC-15: Command Delimiters

An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or denylist input validation, as opposed to allowlist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or denylist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.

CAPEC-81: Web Server Logs Tampering

Web Logs Tampering attacks involve an attacker injecting, deleting or otherwise tampering with the contents of web logs typically for the purposes of masking other malicious behavior. Additionally, writing malicious data to log files may target jobs, filters, reports, and other agents that process the logs in an asynchronous attack pattern. This pattern of attack is similar to "Log Injection-Tampering-Forging" except that in this case, the attack is targeting the logs of the web server and not the application.

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