High severity8.1NVD Advisory· Published Oct 30, 2026

CVE-2026-119717

Description

pybars4 through 0.9.13 contains a code injection vulnerability in pybars/_compiler.py that allows attackers to execute Python code via unescaped bracketed path segments in Handlebars templates. Attackers can supply a template with a crafted segment in a helper or block argument to break out of the generated resolve() string literal and execute code in the application process.

Patches

Vulnerability mechanics

References

github.com/up9inc/pybars4/blob/0.9.13/pybars/_compiler.pynvd
github.com/vladko312/advisories/blob/702e98db9642ece70d9e2150076d8014ffec2db3/pybars3.mdnvd
www.vulncheck.com/advisories/pybars4-through-0.9.13-code-injection-via-bracketed-path-segmentsnvd

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