CVE-2026-119716
pybars3 through 0.9.7 and pybars4 through 0.9.13 Code Injection via Bracketed Path Segments
pybars3 through 0.9.7 and pybars4 through 0.9.13 contain a code injection vulnerability in pybars/_compiler.py that allows template authors to execute Python code via unescaped bracketed path segments. Attackers can supply Handlebars templates with crafted segments in helper or block arguments to break out of string literals and execute Python in the application process.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| pybars3 wbond pybars3
pypi |
≥ 0; ≤ 0.9.7 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
| pybars4 up9inc pybars4
pypi |
≥ 0; ≤ 0.9.13 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 9.3 critical |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 9.8 critical |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/wbond/pybars3/issues/88CNA: VulnCheck · issue-tracking
- https://github.com/wbond/pybars3CNA: VulnCheck · product
- https://github.com/up9inc/pybars4CNA: VulnCheck · product
- https://github.com/vladko312/advisories/blob/702e98db9642ece70d9e2150076d8014ffec2db3/pybars3.mdCNA: VulnCheck · third-party-advisory
- https://github.com/wbond/pybars3/blob/0.9.7/pybars/_compiler.py#L159-L160CNA: VulnCheck · technical-description
- https://github.com/up9inc/pybars4/blob/0.9.13/pybars/_compiler.py#L153-L154CNA: VulnCheck · technical-description
- https://www.vulncheck.com/advisories/pybars3-through-0.9.7-code-injection-via-bracketed-path-segmentsCNA: VulnCheck · third-party-advisory
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