Interpretation Conflict in Symfony - CVE-2026-46626
Published: May 21, 2026
Vulnerability identifier: #VU132053
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-46626
CWE-ID: CWE-436
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: SensioLabs
Affected software:
Symfony
Symfony
Detailed vulnerability description
The vulnerability allows a remote attacker to modify the application environment and debug settings.
The vulnerability exists due to interpretation conflict in SymfonyRuntime::getInput() when processing a crafted query string in a web request with register_argc_argv enabled. A remote attacker can send a specially crafted GET request to modify the application environment and debug settings.
Exploitation requires a web SAPI deployment with register_argc_argv enabled, and the application must be booted through symfony/runtime.
How to mitigate CVE-2026-46626
Install security update from vendor's website.