CVE-2026-55865

MEDIUMPre-NVD 0.0

0.0

Python Liquid: Infinite loop when parsing malformed {% case %} tags

Impact

Given a malformed {% case %} tag without associated {% when %} or {% else %} block, and no terminating {% endcase %} tag, Python Liquid hangs in an infinite loop at parse time. This allows malicious template authors to craft templates for a denial of service attack.

Patches

The issue is fixed in version 2.2.1 with the correction of the liquid.TokenStream.eof attribute. The kind and value of the special EOF token are now the same, so either can be tested against liquid.token.TOKEN_EOF.

Workarounds

Manually correct the definition of liquid.TokenStream.eof before parsing any templates.

import liquid
from liquid.token import TOKEN_EOF
liquid.stream.TokenStream.eof = liquid.Token(TOKEN_EOF, TOKEN_EOF, -1, "")
...

CVSS v3: —
EG Score: 0.0(none)
EPSS: —
KEV: Not listed

Published

June 19, 2026

Last Modified

June 19, 2026

Vendor Advisories for CVE-2026-55865(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

GHSA-vq2f-vcc9-j8mv
GitHub Security AdvisoriesMedium
Python Liquid: Infinite loop when parsing malformed `{% case %}` tags

Affected Packages

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
python-liquid	0.10.0 ... 2.2.0 (71 versions)	2.2.1	—

Data Freshness Timeline

(refreshed 1× in last 7d / 1× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-19 21:25 UTCEG score recompute

Frequently asked(3)

What is CVE-2026-55865?

CVE-2026-55865 is a medium vulnerability published on June 19, 2026. Python Liquid: Infinite loop when parsing malformed {% case %} tags Impact Given a malformed {% case %} tag without associated {% when %} or {% else %} block, and no terminating {% endcase %} tag, Python Liquid hangs in an infinite loop at parse time. This allows malicious template authors to craft…

When was CVE-2026-55865 disclosed?

CVE-2026-55865 was first published in the National Vulnerability Database on June 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

How do I remediate CVE-2026-55865?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55865, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-55865

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