CVE-2026-45133
Fixed in a distro release EPSS <1%CVSS 8.2
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, when the parser is exposed to attacker-controlled input, deeply nested mappings or sequences cause both the block-level (Parser::parseBlock()) and inline (Inline::parseSequence() / Inline::parseMapping()) parsers to recurse without a depth limit. A crafted document exhausts the PHP stack and crashes the worker. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
Products: symfony
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Packagist | symfony/symfony | 5.4.52 |
| Packagist | symfony/symfony | 6.4.40 |
| Packagist | symfony/symfony | 7.4.12 |
| Packagist | symfony/symfony | 8.0.12 |
| Packagist | symfony/yaml | 5.4.52 |
| Packagist | symfony/yaml | 6.4.40 |
| Packagist | symfony/yaml | 7.4.12 |
| Packagist | symfony/yaml | 8.0.12 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | zabbix-web-nginx-pgsql-fips-6.0 | 6.0.45-r4 |
| Chainguard | zabbix-web-nginx-pgsql-fips-7.0 | 7.0.25-r1 |
| Debian 12 | symfony | 5.4.53+dfsg-0+deb12u1 |
| Debian 13 | symfony | 6.4.41+dfsg-0+deb13u1 |
| Debian 14 | symfony | 7.4.12+dfsg-1 |
| Ubuntu 16.04 LTS | symfony | no fix |
| Ubuntu 25.10 | symfony | no fix |
| Ubuntu 26.04 LTS | symfony | no fix |
| Ubuntu 26.10 | symfony | no fix |
| Ubuntu Pro 18.04 LTS | symfony | no fix |
| Ubuntu Pro 20.04 LTS | symfony | no fix |
| Ubuntu Pro 22.04 LTS | symfony | no fix |
| Ubuntu Pro 24.04 LTS | symfony | no fix |