CVE-2026-55865
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk39th percentile - higher than 39% of all known CVEs
Summary
Python Liquid prior to version 2.2.1 contains a vulnerability that causes an infinite loop during parsing of malformed {% case %} tags without corresponding {% when %}, {% else %}, or {% endcase %} blocks. The issue arises because liquid.TokenStream.eof does not return an EOF token with matching kind and value fields, enabling a denial of service attack.
Risk Assessment
The organization is at risk of a Denial of Service (DoS) attack where a malicious template author can craft a Liquid template that hangs the parser indefinitely, potentially causing application unavailability.
Recommendation
Immediately upgrade Python Liquid to version 2.2.1 or later. If upgrading is not possible, restrict template creation to trusted users only.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS