CVE-2024-50343: Symfony/symfony Symfony Has An Incorrect Response Vulnerability

LOW
Advisory Identifier: GHSA-g3rh-rrhp-jhh9
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CVSS 3.1
CWE-20
Published
Advisory Summary

CVE-2024-50343 is a LOW (CVSS 3.1) symfony has an incorrect response vulnerability (CWE-20: Improper Input Validation) affecting Symfony/symfony libraries in the Packagist ecosystem. The issue involves symfony has an incorrect response from validator when input ends with `\n`. Remediation is available by upgrading affected packages to version 5.4.43, 6.4.11, 7.1.4.

CVE-2024-50343 at a Glance

CVE Identifier CVE-2024-50343
GHSA Identifier GHSA-g3rh-rrhp-jhh9
Severity LOW
CVSS v3.1 Base Score 3.1
CWE Classification CWE-20: Improper Input Validation
Affected Product Symfony/symfony
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 3.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2024-50343

To remediate this vulnerability, upgrade all affected Symfony/symfony dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

symfony/symfony fixed: 5.4.43 
Upgrade symfony/symfony to 5.4.43
symfony/symfony fixed: 6.4.11 
Upgrade symfony/symfony to 6.4.11
symfony/symfony fixed: 7.1.4 
Upgrade symfony/symfony to 7.1.4
symfony/validator fixed: 5.4.43 
Upgrade symfony/validator to 5.4.43
symfony/validator fixed: 6.4.11 
Upgrade symfony/validator to 6.4.11
symfony/validator fixed: 7.1.4 
Upgrade symfony/validator to 7.1.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for symfony/symfony

How to Check if You Are Affected

To determine whether your application is affected by CVE-2024-50343, inspect your project dependencies for Symfony/symfony:

inspect dependencies for symfony/symfony

Analyze the terminal output to locate any version of Symfony/symfony in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.4.43), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Symfony/symfony, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Description It is possible to trick a `Validator` configured with a regular expression using the `$` metacharacters, with an input ending with `\n`. ### Resolution Symfony now uses the `D` regex modifier to match the entire input. The patch for this issue is available [here](https://github.com/symfony/symfony/commit/7d1032bbead9a4229b32fa6ebca32681c80cb76f) for branch 5.4. ### Credits We would like to thank Offscript for reporting the issue and Alexandre Daubois for providing the fix.

CVE-2024-50343 Affected Symfony/symfony Versions

6 component(s)
Fixed Versions:
5.4.436.4.117.1.4
Product / Package Ecosystem Affected Versions Fixed Version
symfony/symfony
 Packagist
< 5.4.43
5.4.43
symfony/symfony
 Packagist
≥ 6.0.0
< 6.4.11
6.4.11
symfony/symfony
 Packagist
≥ 7.0.0
< 7.1.4
7.1.4
symfony/validator
 Packagist
< 5.4.43
5.4.43
symfony/validator
 Packagist
≥ 6.0.0
< 6.4.11
6.4.11
symfony/validator
 Packagist
≥ 7.0.0
< 7.1.4
7.1.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/symfony/symfony/security/advisories/GHSA-g3rh-rrhp-jhh9
NVD — CVE-2024-50343 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-50343
Security Fix Commit FIX COMMIT
https://github.com/symfony/symfony/commit/7d1032bbead9a4229b32fa6ebca32681c80cb76f
Symfony/symfony Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2024-50343.yaml
Symfony/symfony Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/validator/CVE-2024-50343.yaml
Symfony/symfony Source Repository REPOSITORY
https://github.com/symfony/symfony
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2025/05/msg00051.html
symfony.com/cve-2024-50343 WEB
https://symfony.com/cve-2024-50343

Frequently Asked Questions

What is CVE-2024-50343?
CVE-2024-50343 is a security vulnerability in Symfony/symfony involving Symfony has an incorrect response from Validator when input ends with `\n` under CWE-20: Improper Input Validation.
Which Symfony/symfony versions are affected?
Affected versions include releases prior to 5.4.43, 6.4.11, 7.1.4 across affected packages: symfony/symfony, symfony/validator.
What version fixes CVE-2024-50343?
Upgrading to 5.4.43, 6.4.11, 7.1.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is symfony/symfony affected?
Yes, symfony/symfony is affected in releases prior to 5.4.43, 6.4.11, 7.1.4. Upgrade your dependency to 5.4.43, 6.4.11, 7.1.4 or later.
Is symfony/validator affected?
Yes, symfony/validator is affected in releases prior to 5.4.43, 6.4.11, 7.1.4. Upgrade your dependency to 5.4.43, 6.4.11, 7.1.4 or later.
What is the CVSS score of CVE-2024-50343?
CVE-2024-50343 has a CVSS v3.1 base score of 3.1 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2024-50343?
CVE-2024-50343 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Packagist dependencies for CVE-2024-50343?
Run the dependency tree command: 'inspect dependencies for symfony/symfony'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-g3rh-rrhp-jhh9",
  "modified" : "2025-11-03T22:49:38Z",
  "published" : "2024-11-06T15:21:08Z",
  "aliases" : [ "CVE-2024-50343" ],
  "summary" : "Symfony has an incorrect response from Validator when input ends with `\\n`",
  "details" : "### Description\n\nIt is possible to trick a `Validator` configured with a regular expression using the `$` metacharacters, with an input ending with `\\n`.\n\n### Resolution\n\nSymfony now uses the `D` regex modifier to match the entire input.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/7d1032bbead9a4229b32fa6ebca32681c80cb76f) for branch 5.4.\n\n### Credits\n\nWe would like to thank Offscript for reporting the issue and Alexandre Daubois for providing the fix.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
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    "ranges" : [ {
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        "introduced" : "6.0.0"
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    } ]
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      } ]
    } ]
  }, {
    "package" : {
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      "name" : "symfony/validator"
    },
    "ranges" : [ {
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      "events" : [ {
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      }, {
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      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/validator"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0"
      }, {
        "fixed" : "6.4.11"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "symfony/validator"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0.0"
      }, {
        "fixed" : "7.1.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/symfony/symfony/security/advisories/GHSA-g3rh-rrhp-jhh9"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-50343"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/symfony/symfony/commit/7d1032bbead9a4229b32fa6ebca32681c80cb76f"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2024-50343.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/validator/CVE-2024-50343.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/symfony/symfony"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2025/05/msg00051.html"
  }, {
    "type" : "WEB",
    "url" : "https://symfony.com/cve-2024-50343"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-11-06T15:21:08Z",
    "nvd_published_at" : "2024-11-06T21:15:06Z"
  }
}