Critical Security Update for perl-YAML-Syck: Denial of Service Vulnerability
Summary
ALSA-2026:67269: Important: perl-YAML-Syck security update. Affects perl-YAML-Syck versions < 1.30-7.el8_10. Fixed in 1.30-7.el8_10. How to fix ↓
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Background
perl-YAML-Syck is a Perl module that provides an interface to the libsyck data serialization library. It allows developers to easily convert Perl data structures to YAML strings and vice versa. This functionality is crucial for applications that require data serialization in a human-readable format. However, the module has been found to have a security vulnerability that can be exploited through crafted YAML documents, leading to potential Denial of Service (DoS) attacks.
Vulnerability Detail
The vulnerability identified as CVE-2026-13713 allows an attacker to create a specially crafted YAML document that, when processed by the YAML-Syck module, can cause the application to hang or crash. This Denial of Service attack can disrupt the normal operation of applications relying on this module, potentially leading to service outages and impacting user experience. The issue arises from improper handling of certain YAML constructs, which can overwhelm the parser.
How To Fix
Minimum fixed version
1.30-7.el8_10
This is the first release that contains the fix.
sudo dnf update perl-YAML-SyckTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If you are unable to update the package immediately, consider implementing input validation to sanitize YAML documents before processing them. This can help mitigate the risk of processing maliciously crafted documents.
Conclusion
The perl-YAML-Syck module has a critical vulnerability that can lead to Denial of Service attacks. It is essential to update to the patched version to protect your applications. Additionally, using tools like Vulert can help monitor for such vulnerabilities in real-time.
See every vulnerability recorded for perl-YAML-Syck →
FAQ
CVE-2026-13713 is a security vulnerability in the perl-YAML-Syck module that allows for Denial of Service attacks through crafted YAML documents.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without any signup.
Exploiting this vulnerability can lead to Denial of Service, causing applications to hang or crash, which can disrupt services and affect users.
Yes, the patched version of perl-YAML-Syck is 1.30-7.el8_10. Updating to this version will resolve the vulnerability.
If an immediate update is not possible, implement input validation to sanitize YAML documents before processing them as a temporary workaround.
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