Packagist/symfony/symfony CVE-2021-41267: medium 6.5, EPSS 1.28%

Webcache Poisoning in symfony/http-kernel

Action: Upgrade symfony/symfony to 5.3.12 or later.

composer require symfony/symfony:5.3.12

Affected

Fixed versions

Sources

• osv: GHSA-q3j3-w37x-hq2q#Packagist/symfony/symfony
• https://github.com/symfony/symfony/security/advisories/GHSA-q3j3-w37x-hq2q
• https://nvd.nist.gov/vuln/detail/CVE-2021-41267
• https://github.com/symfony/symfony/pull/44243
• https://github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487
• https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-kernel/CVE-2021-41267.yaml
• https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-41267.yaml
• https://github.com/symfony/symfony/releases/tag/v5.3.12
• https://symfony.com/cve-2021-41267

CVE-2021-41267 · published 2021-11-24T20:04:25Z · modified 2026-07-08T06:28:30.044634543Z · JSON