Drupal core - Moderately critical - Denial of Service - SA-CORE-2025-005

Project: Drupal coreDate: 2025-November-12Security risk: Moderately critical 13 ∕ 25 AC:Basic/A:None/CI:None/II:Some/E:Theoretical/TD:AllVulnerability: Denial of ServiceAffected versions: >= 8.0.0 < 10.4.9 || >= 10.5.0 < 10.5.6 || >= 11.0.0 < 11.1.9 || >= 11.2.0 < 11.2.8CVE IDs: CVE-2025-13080Description: Drupal Core has a rarely used feature, provided by an underlying library, which allows certain attributes of incoming HTTP requests to be overridden.
This functionality can be abused in a way that may cause Drupal to cache response data that it should not. This can lead to legitimate requests receiving inappropriate cached responses (cache poisoning).
This could be exploited in various ways:

• Broken rendering of some pages
• Unstyled or malformatted pages
• Adverse impacts on client-side functionality

Changes are being made in the underlying library which will mitigate this problem, but in the meantime Drupal core has been hardened to protect against this vulnerability.Solution: Install the latest version:

• If you are using Drupal 10.4, update to Drupal 10.4.9.
• If you are using Drupal 10.5, update to Drupal 10.5.6.
• If you are using Drupal 11.1, update to Drupal 11.1.9.
• If you are using Drupal 11.2, update to Drupal 11.2.8.

Drupal 11.0.x, Drupal 10.3.x, and below are end-of-life and do not receive security coverage. (Drupal 8 and Drupal 9 have both reached end-of-life.)Reported By: 

• Dragos Dumitrescu (dragos-dumi)
• yasser ALLAM (inzo_)
• Nils Destoop (nils.destoop)
• Sven Decabooter (svendecabooter)
• zhero

Fixed By: 

• Alex Pott (alexpott) of the Drupal Security Team
• catch (catch) of the Drupal Security Team
• cilefen (cilefen) of the Drupal Security Team
• Jen Lampton (jenlampton), provisional member of the Drupal Security Team
• Lee Rowlands (larowlan) of the Drupal Security Team
• Dave Long (longwave) of the Drupal Security Team
• Drew Webber (mcdruid) of the Drupal Security Team
• Nils Destoop (nils.destoop)
• Juraj Nemec (poker10) of the Drupal Security Team
• Ra Mänd (ram4nd), provisional member of the Drupal Security Team
• Jess (xjm) of the Drupal Security Team

Coordinated By: 

• catch (catch) of the Drupal Security Team
• Greg Knaddison (greggles) of the Drupal Security Team
• Lee Rowlands (larowlan) of the Drupal Security Team
• Dave Long (longwave) of the Drupal Security Team
• Drew Webber (mcdruid) of the Drupal Security Team
• Juraj Nemec (poker10) of the Drupal Security Team
• Jess (xjm) of the Drupal Security Team