🛡️ CVE-2026-55865 — python-liquid

⚪ Unknown ✅ No Known Exploit CWE-835 NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

```python

import liquid

from liquid.token import TOKEN_EOF

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

# ...

```

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability low.

Weakness class

CVE-2026-55865 is classified as CWE-835: Infinite Loop. A loop condition can never become false for some inputs, hanging the process.

Affected software

CVE-2026-55865 is recorded against 2 packages.

  • python-liquid (fixed in 2.2.1)
  • unknown

Timeline and source

Published on 19 June 2026 and last revised on 13 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
github.com (Package)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CWE CWE-835
Public Exploit ✅ No
Source NVD
Published 2026-06-19
Updated 2026-08-12
Modified 2026-07-13
Fix URL N/A

Affected Packages

Software From version Fixed in
python-liquid — 2.2.1
unknown — —

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