Symfony-YAML Audit Complete! – OSTIF.org
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Post published:June 30, 2026
Post category:Audits / Security / Shielder
The Open Source Technology Improvement Fund is proud to share the results of our security audit of Symfony YAML. Symfony is an open source PHP framework to develop high-performing web applications, and this work specifically focused on the the -YAML (YAML Ain’t Markup Language) component of the PHP project which loads and dumps YAML files. Thanks to Shielder and the Sovereign Tech Agency, this project received custom security review to further harden the project against risk.
Audit Process :
Executed by a Shielder security researcher, this work focused on assessment of the risk of passing untrusted YAML content and security-relevant documentation. Leveraging fuzzing in combination with manual source code review, the work focused on identifying weaknesses around YAML parsing, including running a script to test the implementation of the YAML test suite.
Audit Results :
5 Findings with Security Impact
3 Low
2 Informational
Future Security Recommendations
The low findings from this engagement were issued CVEs and documentation relating to this work has been updated by Symfony maintainers. If you are interested in supporting or contributing to the Symfony project, you can learn more about their work on their webpage.
Thank you to the individuals and groups that made this engagement possible:
Symfony-YAML maintainers and community, especially: Nicolas Grekas and Fabien Potencier
Shielder, especially: Pietro Tirenna and Abdel Adim Oisfi
Sovereign Tech Agency
You can read the Audit Report HERE
See Shielder’s blog HERE
Everyone around the world depends on open source software. If you’re interested in supporting this critical work, reach out to us!
Tags: OSTIF, Shielder, Sovereign Tech Agency, Symfony, YAML
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