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

unknown Affects symfony/expression-language, symfony/symfony. Feed 2026.10.29.1, updated 2026-10-28; CVE published 2026.

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

Package
symfony/expression-language Composer
Affected versions
>=2.4.0 and <3.0.0 or >=3.0.0 and <4.0.0 or >=4.0.0 and <5.0.0 or >=5.0.0 and <5.1.0 or >=5.1.0 and <5.2.0 or >=5.2.0 and <5.3.0 or >=5.3.0 and <5.4.0 or >=5.4.0 and <5.4.54 or >=6.0.0 and <6.1.0 or >=6.1.0 and <6.2.0 or >=6.2.0 and <6.3.0 or >=6.3.0 and <6.4.0 or >=6.4.0 and <6.4.48 or >=7.0.0 and <7.1.0 or >=7.1.0 and <7.2.0 or >=7.2.0 and <7.3.0 or >=7.3.0 and <7.4.0 or >=7.4.0 and <7.4.21 or >=8.0.0 and <8.1.0 or >=8.1.0 and <8.1.9
Fixed in
5.4.54, 6.4.48, 7.4.21, 8.1.9
Severity
unknown
Exploitation
not on CISA KEV · EPSS 0% (31.6th percentile)
Source
friendsofphp

References

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

Package
symfony/symfony Composer
Affected versions
>=2.4.0 and <3.0.0 or >=3.0.0 and <4.0.0 or >=4.0.0 and <5.0.0 or >=5.0.0 and <5.1.0 or >=5.1.0 and <5.2.0 or >=5.2.0 and <5.3.0 or >=5.3.0 and <5.4.0 or >=5.4.0 and <5.4.54 or >=6.0.0 and <6.1.0 or >=6.1.0 and <6.2.0 or >=6.2.0 and <6.3.0 or >=6.3.0 and <6.4.0 or >=6.4.0 and <6.4.48 or >=7.0.0 and <7.1.0 or >=7.1.0 and <7.2.0 or >=7.2.0 and <7.3.0 or >=7.3.0 and <7.4.0 or >=7.4.0 and <7.4.21 or >=8.0.0 and <8.1.0 or >=8.1.0 and <8.1.9
Fixed in
5.4.54, 6.4.48, 7.4.21, 8.1.9
Severity
unknown
Exploitation
not on CISA KEV · EPSS 0% (31.6th percentile)
Source
friendsofphp

References

NVD recordsymfony/expression-language advisoriessymfony/symfony advisories

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