CVE-2026-55865

Description

Python Liquid is a Python engine for the Liquid template language. Prior to 2.2.1, given a malformed {% case %} tag without an associated {% when %} or {% else %} block and no terminating {% endcase %} tag, Python Liquid hangs in an infinite loop at parse time because liquid.TokenStream.eof did not give the EOF token matching kind and value fields, allowing malicious template authors to craft templates for a denial of service attack. This issue is fixed in version 2.2.1.

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Weakness Type (CWE)

CWE-835 CWE-835

References

Other References

https://github.com/jg-rp/liquid/commit/26db8931cf35e8433c1ca506fc32c3bb62f743d4 https://github.com/jg-rp/liquid/releases/tag/v2.2.1 https://github.com/jg-rp/liquid/security/advisories/GHSA-vq2f-vcc9-j8mv

Frequently Asked Questions

What is CVE-2026-55865? +

Python Liquid is a Python engine for the Liquid template language. Prior to 2.2.1, given a malformed {% case %} tag without an associated {% when %} or {% else %} block and no terminating {% endcase %} tag, Python Liquid hangs in an infinite loop at parse time because liquid.TokenStream.eof did not give the EOF token matching kind and value fields, allowing malicious template authors to craft templates for a denial of service attack. This issue is fixed in version 2.2.1.

How do I check if I'm vulnerable to CVE-2026-55865? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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