EUVD-2026-42693
GHSA-vq2f-vcc9-j8mv
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attacker must be able to submit a template (PR:L) to a network-reachable parser with a trivial payload (AC:L); impact is availability-only (A:H, C:N/I:N) with no scope change.
Primary rating from Vendor (https://github.com/jg-rp/liquid).
CVSS VectorVendor: https://github.com/jg-rp/liquid
Lifecycle Timeline
7DescriptionCVE.org
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, "")
# ...AnalysisAI
Parsing denial of service in python-liquid before version 2.2.1 allows authenticated template authors to cause an infinite loop by submitting a malformed {% case %} tag without associated {% when %}, {% else %}, or {% endcase %}. The vulnerability resides in the token stream's EOF property, leading to an unreachable exit condition (CWE-835). A publicly available fix and detailed reproduction steps exist, but no active exploitation has been reported.
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Same technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today