Common Weakness Enumeration
CWE-93
AllowedImproper Neutralization of CRLF Sequences ('CRLF Injection')
Abstraction: Base · Status: Draft
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.
323 vulnerabilities reference this CWE, most recent first.
CVE-2026-46739 (GCVE-0-2026-46739)
Vulnerability from cvelistv5 – Published: 2026-06-04 15:45 – Updated: 2026-06-19 15:30
VLAI
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/cosimo/perl5-net-statsd/pull/10 | issue-tracking |
| https://www.cve.org/CVERecord?id=CVE-2026-46719 | related |
| https://www.cve.org/CVERecord?id=CVE-2026-46720 | related |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| COSIMO | Net::Statsd |
Affected:
0 , < 0.13
(custom)
|
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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
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://metacpan.org/release/RRWO/Net-Statsd-Tiny… | release-notes |
| https://github.com/robrwo/Net-Statsd-Tiny/commit/… | patch |
| https://www.cve.org/CVERecord?id=CVE-2026-46719 | related |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| RRWO | Net::Statsd::Tiny |
Affected:
0 , < 0.3.8
(custom)
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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
EPSS
VEX
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)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
Impacted products
1 product
| 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
EPSS
VEX
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)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/yhirose/cpp-httplib/security/a… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| yhirose | cpp-httplib |
Affected:
< 0.44.0
|
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CVE-2026-45070 (GCVE-0-2026-45070)
Vulnerability from cvelistv5 – Published: 2026-07-14 18:25 – Updated: 2026-07-14 18:25
VLAI
EPSS
VEX
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
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/symfony/symfony/security/advis… | x_refsource_CONFIRM |
| https://github.com/symfony/symfony/commit/e62ea21… | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v5.4.52 | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v6.4.40 | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v7.4.12 | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v8.0.12 | x_refsource_MISC |
Impacted products
2 products
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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
EPSS
VEX
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
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/symfony/symfony/security/advis… | x_refsource_CONFIRM |
| https://github.com/symfony/symfony/commit/a1c42cb… | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v5.4.52 | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v6.4.40 | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v7.4.12 | x_refsource_MISC |
| https://github.com/symfony/symfony/releases/tag/v8.0.12 | x_refsource_MISC |
Impacted products
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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
EPSS
VEX
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
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/rexxars/sse-channel/security/a… | x_refsource_CONFIRM |
| https://github.com/rexxars/sse-channel/issues/42 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| rexxars | sse-channel |
Affected:
< 4.0.1
|
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CVE-2026-44214 (GCVE-0-2026-44214)
Vulnerability from cvelistv5 – Published: 2026-05-26 19:34 – Updated: 2026-05-27 13:19
VLAI
EPSS
VEX
Title
eventsource-encoder: SSE event injection via unsanitized event and id fields
Summary
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 arbitrary Server-Sent Events line terminators (\n, \r, or \r\n) and thereby forge additional SSE fields or entire messages on the stream. This vulnerability is fixed in 1.0.2.
Severity
5.8 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/rexxars/eventsource-encoder/se… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| rexxars | eventsource-encoder |
Affected:
< 1.0.2
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CVE-2026-43969 (GCVE-0-2026-43969)
Vulnerability from cvelistv5 – Published: 2026-05-11 18:06 – Updated: 2026-05-12 04:26
VLAI
EPSS
VEX
Title
Cookie Request Header Injection via Unvalidated Encoder in cow_cookie:cookie/1
Summary
Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in ninenines cowlib allows HTTP request splitting and cookie smuggling via unvalidated cookie name and value fields.
cow_cookie:cookie/1 in cowlib builds a client-side Cookie: request header from a list of name-value pairs without validating either field. An attacker who controls the cookie names or values passed to this function can inject ;, ,, CR, LF, or TAB characters into the serialized header. This enables two classes of attack: cookie smuggling within a single header (e.g. injecting "; admin=1" to introduce a phantom cookie that the receiving server treats as authentic) and HTTP request header splitting (injecting CRLF to append arbitrary headers or smuggle a complete second request against a shared upstream proxy). The decoder side (parse_cookie_name/1, parse_cookie_value/1) and setcookie/3 already validate and reject these characters; the encoder alone is missing the check.
This issue affects cowlib from 2.9.0.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cna.erlef.org/cves/CVE-2026-43969.html | relatedthird-party-advisory |
| https://osv.dev/vulnerability/EEF-CVE-2026-43969 | related |
| https://github.com/erlef/cowlib/commit/177953dd51… | patch |
Impacted products
Credits
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CVE-2026-43968 (GCVE-0-2026-43968)
Vulnerability from cvelistv5 – Published: 2026-05-11 18:06 – Updated: 2026-05-12 12:11
VLAI
EPSS
VEX
Title
CR Injection in SSE Encoder Enables Event Splitting via cow_sse:event/1
Summary
Improper Neutralization of CRLF Sequences ('CRLF Injection') vulnerability in ninenines cowlib allows SSE event splitting and injection via unvalidated field values.
cow_sse:event/1 in cowlib guards the id and event fields against \n but not against bare \r, and the internal prefix_lines/2 function used for data and comment fields splits only on \n. Because the SSE specification requires decoders to treat \r\n, \r, and \n as equivalent line terminators, an attacker who controls any of these fields can inject additional SSE lines and forge a complete event with an arbitrary event type and data payload on the receiving end. In typical deployments where browser EventSource clients or other SSE consumers dispatch on event.type and render event.data, this enables event splitting, client-side logic manipulation, and stored-XSS-equivalent behaviour when event data is inserted into the DOM.
This issue affects cowlib from 2.6.0 before 2.16.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cna.erlef.org/cves/CVE-2026-43968.html | relatedthird-party-advisory |
| https://osv.dev/vulnerability/EEF-CVE-2026-43968 | related |
| https://github.com/ninenines/cowlib/commit/6165fc… | patch |
Impacted products
Credits
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}
],
"value": "Sanitize user-controlled values before passing them to cow_sse:event/1: reject or strip any value containing \\r or \\n characters in the id, event, data, and comment fields. Alternatively, ensure that all SSE field values are derived exclusively from trusted, application-controlled data rather than user input."
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-43968",
"datePublished": "2026-05-11T18:06:42.881Z",
"dateReserved": "2026-05-04T18:23:25.573Z",
"dateUpdated": "2026-05-12T12:11:43.388Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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.