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certfr-2026-avi-0617 — De multiples vulnérabilités ont été découvertes dans Symfony. Certaines d'entre elles permettent à un attaquant de prov…

certfr-2026-avi-0617

EUVD-2026-336743

fkie_cve-2026-45304

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, Symfony\Component\Yaml\Parser resolved YAML collection aliases recursively, allowing a small untrusted YAML input to expand into a multi-gigabyte structure and exhaust memory. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.

GHSA-4qpc-3hr4-r2p4 — Symfony's YAML Parser Vulnerable to Exponential Memory Allocation via Recursive Collection-Alias Expansion ("Billion La…

Affected: Packagist: symfony/yaml, Packagist: symfony/symfony

### Description

`Symfony\Component\Yaml\Parser` resolves YAML aliases (`*anchor`) during parsing. Aliases that reference *collections* (arrays, `stdClass`, `TaggedValue`-wrapped collections) can themselves point to other collections containing aliases, creating exponential expansion at resolution time. A small input can blow up into a multi-gigabyte structure and exhaust memory: the classic "Billion Laughs" denial-of-service against any parser exposed to untrusted YAML.

### Resolution

The `Parser` now counts collection alias resolutions in a shared `ParserState` object, with a default limit of **128**, following the [SnakeYAML model](https://github.com/snakeyaml/snakeyaml/blob/master/src/main/java/org/yaml/snakeyaml/LoaderOptions.java). Scalar aliases remain unrestricted since they cannot drive exponential growth. The limit is configurable via a new `$maxAliasesForCollections` argument on `Parser::__construct()`, `Yaml::parse()` and `Yaml::parseFile()`. A new `Yaml::PARSE_EXCEPTION_ON_ALIAS` flag also rejects all aliases outright when parsing fully untrusted input.

The patch for this issue is available [here](https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a970a) for branch 5.4.

### Credits

Symfony would like to thank Pietro Tirenna (Shielder) for reporting the issue and Nicolas Grekas for fixing it.

UBUNTU-CVE-2026-45304

Affected: Ubuntu:16.04:LTS: symfony, Ubuntu:Pro:18.04:LTS: symfony, Ubuntu:Pro:20.04:LTS: symfony, Ubuntu:Pro:22.04:LTS: symfony, Ubuntu:Pro:24.04:LTS: symfony, Ubuntu:25.10: symfony, Ubuntu:26.04:LTS: symfony

WID-SEC-W-2026-1805 — Zabbix: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Zabbix ausnutzen, um einen Denial of Service Angriff durchzuführen, und um Sicherheitsvorkehrungen zu umgehen.