Interpretation Conflict in Symfony - CVE-2026-46626
Published: May 21, 2026
Vulnerability identifier: #VU132053
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2026-46626
CWE-ID: CWE-436
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Symfony
Debian Linux
symfony (Debian package)
Debian Linux
symfony (Debian package)
How to mitigate CVE-2026-46626
Install security update from vendor's website.
Symfony - addressed in versions 5.4.52, 6.4.40, 7.4.12, 8.0.12
symfony (Debian package) - addressed in versions 5.4.53+dfsg-0+deb12u1, 6.4.41+dfsg-0+deb13u1
symfony (Debian package) - addressed in versions 5.4.53+dfsg-0+deb12u1, 6.4.41+dfsg-0+deb13u1