CVE-2026-109449: Unbounded Nesting in the Expression Parser Lets Untrusted Expressions Crash the Process

PKSA-vq1j-sc3k-jzzk CVE-2026-109449

Affected version: >=2.4.0,<3.0.0|>=3.0.0,<4.0.0|>=4.0.0,<5.0.0|>=5.0.0,<5.1.0|>=5.1.0,<5.2.0|>=5.2.0,<5.3.0|>=5.3.0,<5.4.0|>=5.4.0,<5.4.54|>=6.0.0,<6.1.0|>=6.1.0,<6.2.0|>=6.2.0,<6.3.0|>=6.3.0,<6.4.0|>=6.4.0,<6.4.48|>=7.0.0,<7.1.0|>=7.1.0,<7.2.0|>=7.2.0,<7.3.0|>=7.3.0,<7.4.0|>=7.4.0,<7.4.21|>=8.0.0,<8.1.0|>=8.1.0,<8.1.9

Reported by:
FriendsOfPHP/security-advisories