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.

379 vulnerabilities reference this CWE, most recent first.

CVE-2026-46741 (GCVE-0-2026-46741)

Vulnerability from cvelistv5 – Published: 2026-06-04 15:54 – Updated: 2026-06-19 15:31
VLAI
Title
Etsy::StatsD versions through 1.002002 for Perl allow metric injections
Summary
Etsy::StatsD versions through 1.002002 for Perl allow metric injections. The metric names and values are not checked for newlines, colons or pipes. Metrics generated from untrusted sources could inject additional statsd metrics. Note that the git repository contains an unreleased version with the gauge and set methods that also do not check for potential metric injections.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-04 17:40 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences
  • CWE-150 - Improper Neutralization of Escape, Meta, or Control Sequences
Assigner
References
Impacted products
Vendor Product Version
SANBEG Etsy::StatsD Affected: 0 , ≤ 1.002002 (custom)
Create a notification for this product.
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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
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              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "HIGH",
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              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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            }
          },
          {
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                "options": [
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                  },
                  {
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                  },
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                  }
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                "timestamp": "2026-06-04T17:40:21.895127Z",
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          }
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          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
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            },
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            },
            {
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            }
          ],
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              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-150",
              "description": "CWE-150 Improper Neutralization of Escape, Meta, or Control Sequences",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
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}

CVE-2026-46740 (GCVE-0-2026-46740)

Vulnerability from cvelistv5 – Published: 2026-05-26 22:48 – Updated: 2026-06-19 15:31
VLAI
Title
Mojolicious::Plugin::Statsd versions through 0.04 for Perl allowed metric injections
Summary
Mojolicious::Plugin::Statsd versions through 0.04 for Perl allowed metric injections. The metric names and set values were not checked for newlines, colons or pipes. Metrics generated from untrusted sources could inject additional statsd metrics. Version 0.06 changes the module from being a statsd client to using a separate statsd client. It defaults to using a version of Net::Statsd::Tiny that fixes a similar issue (CVE-2026-46720).
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: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-28 14:20 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences
  • CWE-150 - Improper Neutralization of Escape, Meta, or Control Sequences
Assigner
References
Impacted products
Vendor Product Version
RRWO Mojolicious::Plugin::Statsd Affected: 0 , ≤ 0.04 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 5.3,
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              "userInteraction": "NONE",
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              "lang": "en",
              "type": "CWE"
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        }
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        }
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      },
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  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-46739 (GCVE-0-2026-46739)

Vulnerability from cvelistv5 – Published: 2026-06-04 15:45 – Updated: 2026-06-19 15:30
VLAI
Title
Net::Statsd versions before 0.13 for Perl allow metric injections
Summary
Net::Statsd versions before 0.13 for Perl allow metric injections. The metric names are not checked for newlines, colons or pipes. Metrics generated from untrusted sources could inject additional statsd metrics. The update_stats (used for updating counters) and gauge methods do not check that values are numeric (which would block metric injection).
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 2026-06-04 17:47 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences
  • CWE-150 - Improper Neutralization of Escape, Meta, or Control Sequences
Assigner
References
Impacted products
Vendor Product Version
COSIMO Net::Statsd Affected: 0 , < 0.13 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 5.3,
              "baseSeverity": "MEDIUM",
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          "shortName": "CISA-ADP"
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    ],
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            {
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            },
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              "type": "CWE"
            }
          ]
        },
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          "descriptions": [
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              "type": "CWE"
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        },
        {
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          "tags": [
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}

CVE-2026-46720 (GCVE-0-2026-46720)

Vulnerability from cvelistv5 – Published: 2026-05-17 17:51 – Updated: 2026-06-19 15:29
VLAI
Title
Net::Statsd::Tiny versions before 0.3.8 for Perl allowed metric injections
Summary
Net::Statsd::Tiny versions before 0.3.8 for Perl allowed metric injections. The metric names and set values were not checked for newlines, colons or pipes. Metrics generated from untrusted sources could inject additional statsd metrics.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-18 12:54 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences
  • CWE-150 - Improper Neutralization of Escape, Meta, or Control Sequences
Assigner
References
Impacted products
Vendor Product Version
RRWO Net::Statsd::Tiny Affected: 0 , < 0.3.8 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 8.2,
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              "content": {
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                "options": [
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        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Net-Statsd-Tiny",
          "product": "Net::Statsd::Tiny",
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            }
          ],
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              "lessThan": "0.3.8",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
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          ]
        }
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          "lang": "en",
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        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
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              "description": "CWE-93 Improper Neutralization of CRLF Sequences",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-150",
              "description": "CWE-150 Improper Neutralization of Escape, Meta, or Control Sequences",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-19T15:29:55.058Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "release-notes"
          ],
          "url": "https://metacpan.org/release/RRWO/Net-Statsd-Tiny-v0.3.8/changes"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/robrwo/Net-Statsd-Tiny/commit/06f814f52fbcc0b2afddf7a2d6f8137fd3cede13.patch"
        },
        {
          "tags": [
            "related"
          ],
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-46719"
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        {
          "lang": "en",
          "value": "Upgrade to Net::Statsd::Tiny version 0.3.8 or later."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "timeline": [
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          "lang": "en",
          "time": "2026-05-14T00:00:00.000Z",
          "value": "Issue reported to CPANSec"
        },
        {
          "lang": "en",
          "time": "2026-05-15T00:00:00.000Z",
          "value": "Author notified"
        },
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CVE-2026-46719 (GCVE-0-2026-46719)

Vulnerability from cvelistv5 – Published: 2026-05-16 13:37 – Updated: 2026-06-19 15:28
VLAI
Title
Net::Statsd::Lite versions before 0.9.0 for Perl allowed metric injections
Summary
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.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-19 12:51 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences
  • CWE-150 - Improper Neutralization of Escape, Meta, or Control Sequences
Assigner
References
Impacted products
Vendor Product Version
RRWO Net::Statsd::Lite Affected: 0 , < 0.9.0 (custom)
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CVE-2026-45372 (GCVE-0-2026-45372)

Vulnerability from cvelistv5 – Published: 2026-05-29 19:21 – Updated: 2026-06-01 17:57
VLAI
Title
cpp-httplib: HTTP header value percent-decoding in server-side `parse_header` enables CRLF injection
Summary
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's server parses an incoming request, it applies percent-decoding to every header value except Location and Referer. The validity check (is_field_value) is run before decoding, so encoded %0D%0A passes the check and is then expanded to a literal \r\n byte pair inside the stored header value. This vulnerability is fixed in 0.44.0.
Severity
9.9 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-01 17:57 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
Vendor Product Version
yhirose cpp-httplib Affected: < 0.44.0
Create a notification for this product.
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CVE-2026-45125 (GCVE-0-2026-45125)

Vulnerability from cvelistv5 – Published: 2026-08-18 15:50 – Updated: 2026-08-18 17:46
VLAI
Title
MyBB: Email User CRLF injection
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the Email User controller does not sanitize sender names correctly, resulting in mail header injection. member.php?action=do_emailuser accepts the fromname HTTP parameter for guests or the stored username for authenticated users when the cansendemail group permission is enabled. When mail_handler is set to the default PHP mail value, the sender name is used without sanitization in Return-Path and Reply-To headers, allowing arbitrary headers to be injected with CRLF sequences. This issue is fixed in version 1.8.40.
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 2026-08-18 17:44 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Vendor Product Version
mybb mybb Affected: < 1.8.40
Create a notification for this product.
Show details on NVD website
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CVE-2026-45070 (GCVE-0-2026-45070)

Vulnerability from cvelistv5 – Published: 2026-07-14 18:25 – Updated: 2026-07-16 14:31
VLAI
Title
Symfony: Email Header Injection via Non-Token Characters in Mime Parameter Names
Summary
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 caller that derives a parameter name from untrusted input to include CRLF or other non-token bytes and inject additional headers into rendered structured mail headers such as Content-Type or Content-Disposition. This issue is reported as fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-16 14:31 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Vendor Product Version
symfony symfony Affected: < 5.4.52
Affected: >= 6.0.0-BETA1, < 6.4.40
Affected: >= 7.0.0-BETA1, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.12
Create a notification for this product.
symfony mime Affected: < 5.4.52
Affected: >= 6.0.0-BETA1, < 6.4.40
Affected: >= 7.0.0-BETA1, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.12
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-45067 (GCVE-0-2026-45067)

Vulnerability from cvelistv5 – Published: 2026-07-14 17:41 – Updated: 2026-07-14 18:15
VLAI
Title
Symfony: Email Header / SMTP Command Injection via CRLF in Symfony\Component\Mime\Address
Summary
### Description `Symfony\Component\Mime\Address` is the value-object every Symfony Mailer address (to/cc/bcc/from/reply-to) flows through; its constructor is documented as validating the address and throwing on invalid input, so developers treat it as a security boundary. The constructor accepts email addresses whose local-part (the part before `@`) is an RFC-5322 *quoted string* containing raw `\r\n` bytes — e.g. `"x\r\nBcc: attacker@evil"@example.com`. The stored address is later emitted verbatim into (1) the rendered message headers and (2) `SmtpTransport`'s `MAIL FROM:<...>` / `RCPT TO:<...>` protocol lines, turning the embedded CRLF into a new mail header and/or a new SMTP command. ### Resolution The `Address` constructor now rejects addresses containing line breaks. The patch for this issue is available [here](https://github.com/symfony/symfony/commit/dc2dbd29211eb4ddc451373fa1374fb926e94604) for branch 5.4. ### Credits We would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 18:15 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Vendor Product Version
symfony symfony Affected: < 5.4.52
Affected: >= 6.0.0-BETA1, < 6.4.40
Affected: >= 7.0.0-BETA1, < 7.4.12
Affected: >= 8.0.0-BETA1, < 8.0.12
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-44217 (GCVE-0-2026-44217)

Vulnerability from cvelistv5 – Published: 2026-05-12 19:51 – Updated: 2026-05-14 19:52
VLAI
Title
sse-channel: SSE Injection via unsanitized event fields
Summary
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 arbitrary messages into the stream. This vulnerability is fixed in 4.0.1.
Severity
6.6 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-14 19:50 UTC
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Vendor Product Version
rexxars sse-channel Affected: < 4.0.1
Create a notification for this product.
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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