Vulnerability · Published Jul 9, 2026 · Assigned by GitHub_M

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

High 7.1

In plain English

A high-severity infinite loop in liquid from jg-rp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.5%top 60.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	python-liquid	2.2.1	GHSA-vq2f-vcc9-j8mv
PyPI	python-liquid	2.2.1	PYSEC-2026-3035

Affected products (as reported)

Vendor	Product	Versions
jg-rp	liquid	< 2.2.1

Weakness: CWE-835 · 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

References

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