# symfony/yaml (Packagist) vulnerabilities

7 known vulnerabilities (5 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: not known (cve.now hasn't read this package's releases)
- Newest unaffected release: not known without release data
- Registry: https://packagist.org/packages/symfony/yaml

## Advisories (7)

### [CVE-2026-123792](https://cve.now/CVE-2026-123792): Symfony: Exponential and Quadratic Parse Times in the YAML Parser Let a Single Document Hold a Process

- Severity: High 8.7
- Published: Nov 6, 2026
- Affected: fixed in 5.4.56; from 6.0.0, fixed in 6.4.50; from 7.0.0, fixed in 7.4.23; from 8.0.0, fixed in 8.1.11.

### [CVE-2026-109413](https://cve.now/CVE-2026-109413): Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process

- Severity: High 8.7
- Published: Oct 15, 2026
- Affected: from 2.0.0, fixed in 5.4.54; from 6.0.0, fixed in 6.4.45; from 7.0.0, fixed in 7.4.18; from 8.0.0, fixed in 8.1.6.

### [CVE-2026-45305](https://cve.now/CVE-2026-45305): Symfony: YAML Parser ReDoS via Catastrophic Backtracking in Parser::cleanup() Regex

- Severity: High 8.7
- Published: Jul 14, 2026
- Affected: fixed in 5.4.52; from 6.0.0, fixed in 6.4.40; from 7.0.0, fixed in 7.4.12; from 8.0.0, fixed in 8.0.12.

### [CVE-2026-45304](https://cve.now/CVE-2026-45304): Symfony: YAML Parser Exponential Memory Allocation via Recursive Collection-Alias Expansion ("Billion Laughs")

- Severity: High 8.7
- Published: Jul 14, 2026
- Affected: fixed in 5.4.52; from 6.0.0, fixed in 6.4.40; from 7.0.0, fixed in 7.4.12; from 8.0.0, fixed in 8.0.12.

### [CVE-2026-45133](https://cve.now/CVE-2026-45133): Symfony: \[Yaml\] Harden the parser when handling untrusted input

- Severity: High 8.2
- Published: Jul 14, 2026
- Affected: fixed in 5.4.52; from 6.0.0, fixed in 6.4.40; from 7.0.0, fixed in 7.4.12; from 8.0.0, fixed in 8.0.12.

### [CVE-2013-1397](https://cve.now/CVE-2013-1397): Symfony 2.0.x before 2.0.22, 2.1.x before 2.1.7, and 2.2.x remote attackers to execute arbitrary PHP code via a serialized PHP object to…

- Severity: Unrated
- Published: Jun 2, 2014
- Affected: from 2.0.0, fixed in 2.0.22; from 2.1.0, fixed in 2.1.7; from 2.2.0-BETA1, fixed in 2.2.0-BETA2.

### [CVE-2013-1348](https://cve.now/CVE-2013-1348): The Yaml::parse function in Symfony 2.0.x before 2.0.22 remote attackers to execute arbitrary PHP code via a PHP file, a different…

- Severity: Unrated
- Published: Jun 2, 2014
- Affected: from 2.0.0, fixed in 2.0.22.

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