Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
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.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
🚨 HIGH: CVE-2026-45133 (CVSS 7.5) affects Symfony PHP framework. Uncontrolled recursion in YAML parser causes DoS via crafted documents. Patch NOW to 5.4.52, 6.4.40, 7.4.12, or 8.0.12. #CVE #PatchNow #ThreatIntel https://t.co/NO271GJUqA
Post summary
High‑severity CVE‑2026‑45133 causes a denial‑of‑service in Symfony through uncontrolled YAML recursion; immediate patches are available for all supported releases.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | sensiolabs | symfony | - | - | - |