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.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00451.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
jg-rp liquid affected
Version Status Constraints
< 2.2.1 affected —

No data.

No data.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-vq2f-vcc9-j8mv Python Liquid: Infinite loop when parsing malformed `{% case %}` tags
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/jg-rp/liquid/commit/26db8931cf35e8433c1ca506fc32c3bb62f743d4 cve-icon
https://github.com/jg-rp/liquid/releases/tag/v2.2.1 cve-icon
https://github.com/jg-rp/liquid/security/advisories/GHSA-vq2f-vcc9-j8mv cve-icon
History

Thu, 09 Jul 2026 23:15:00 +0000

Type Values Removed Values Added
First Time appeared Jg-rp
Jg-rp liquid
Vendors & Products Jg-rp
Jg-rp liquid

Thu, 09 Jul 2026 21:15:00 +0000

Type Values Removed Values Added
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.
Title Python Liquid: Infinite loop when parsing malformed `{% case %}` tags
Weaknesses CWE-835
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-09T20:34:38.618Z

Reserved: 2026-06-17T16:44:40.996Z

Link: CVE-2026-55865

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-10T13:15:16Z

Weaknesses