What’s Vulnerable › Vulnerabilities

CVE-2026-55865: Python Liquid: Infinite loop when parsing malformed `{% case %}` tags

• Severity: high (CVSS 7.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-09 · updated 2026-10-25
• Weakness: CWE-835

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.

Affected products

• jg-rp liquid: before 2.2.1

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

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