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High

Symfony vulnerable to denial of service via a malicious HTTP Host header

  • Disclosed: 30.05.2024
  • Updated: 11.10.2026 10:22

All 2.0.X, 2.1.X, 2.2.X, 2.3.X, 2.4.X, and 2.5.X versions of the Symfony HttpFoundation component are affected by this security issue.

This issue has been fixed in Symfony 2.3.19, 2.4.9, and 2.5.4. Note that no fixes are provided for Symfony 2.0, 2.1, and 2.2 as they are not maintained anymore.

Description When an arbitrarily long hostname is sent by a client, its parsing in Request::getHost() can lead to a DoS attack, due to the way we validate the hostname via a regular expression.

Resolution The regular expression used to parse and validate the hostname from the HTTP request has been modified to avoid too much sensitivity to the submitted value length.

The patch for this issue is available here: https://github.com/symfony/symfony/pull/11828

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package symfony/http-foundation >= 2.0.0, < 2.3.19, >= 2.4.0, < 2.4.9, >= 2.5.0, < 2.5.4 2.3.19, 2.4.9, 2.5.4
Composer package symfony/symfony >= 2.0.0, < 2.3.19, >= 2.4.0, < 2.4.9, >= 2.5.0, < 2.5.4 2.3.19, 2.4.9, 2.5.4

References

CVSS score 7.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-1333
Platform
Composer
Package
symfony/http-foundation, symfony/symfony
Disclosed
30.05.2024
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-v77v-x634-9m56 - CC BY 4.0

Vulnerability history: symfony/http-foundation

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (14) in the archive
Total entries
14
First → latest
12.2019 06.2026
Without a fix
0
Exploited in attacks
0

Severity breakdown

  • Critical 1
  • High 3
  • Medium 8
  • Low 2

Disclosures per year

Severity:
  1. Symfony's incorrect parsing of PATH_INFO can lead to limited authorization bypass
    High · 7.3 CVE-2025-64500 < 5.4.50, >= 6.0.0, < 6.4.29, >= 7.0.0, < 7.3.7 5.4.50, 6.4.29, 7.3.7
  2. Symfony vulnerable to denial of service via a malicious HTTP Host header this entry
    High · 7.5 CVE-2014-5244 >= 2.0.0, < 2.3.19, >= 2.4.0, < 2.4.9, >= 2.5.0, < 2.5.4 2.3.19, 2.4.9, 2.5.4
  3. Invalid HTTP method overrides allow possible XSS or other attacks in Symfony
    Critical · 9.8 CVE-2019-10913 >= 2.7.0, < 2.7.51, >= 2.8.0, < 2.8.50, >= 3.0.0, < 3.4.26, >= 4.0.0, < 4.1.12, >= 4.2.0, < 4.2.7 2.7.51, 2.8.50, 3.4.26, 4.1.12, 4.2.7
  4. Argument injection in a MimeTypeGuesser in Symfony
    High · 7.5 CVE-2019-18888 >= 2.0.0, < 2.8.52, >= 3.0.0, < 3.4.35, >= 4.0.0, < 4.2.12, >= 4.3.0, < 4.3.8 2.8.52, 3.4.35, 4.2.12, 4.3.8

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