jg-rp liquid up to 2.2.0 TokenStream TokenStream.eof infinite loop

Summaryinfo

A vulnerability was found in jg-rp liquid up to 2.2.0. It has been classified as problematic. This affects the function eof of the file TokenStream.eof of the component TokenStream. Performing a manipulation results in infinite loop. This vulnerability is cataloged as CVE-2026-55865. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in jg-rp liquid up to 2.2.0. This affects the function eof of the file TokenStream.eof of the component TokenStream. The manipulation with an unknown input leads to a infinite loop vulnerability. CWE is classifying the issue as CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. This is going to have an impact on availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-55865 since 06/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 2.2.1 eliminates this vulnerability.

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Productinfo

Vendor

• jg-rp

Name

• liquid

Version

• 2.0
• 2.1
• 2.2.0

Website

• Product: https://github.com/jg-rp/liquid/

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