Bug 2455413 (CVE-2026-34444)

Summary: CVE-2026-34444 lupa: Lupa: Arbitrary Code Execution due to inconsistent attribute filtering
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: anthomas, ehelms, ggainey, jkoehler, juwatts, lphiri, mbarnett, mhulan, nmoumoul, osousa, pcreech, rchan, smallamp, tmalecek
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Lupa, a tool that integrates Lua or LuaJIT2 runtimes into CPython. An attacker can exploit this vulnerability by bypassing attribute filtering mechanisms when accessing attributes through built-in functions like `getattr` and `setattr`. This inconsistency in applying security restrictions can allow an attacker to execute arbitrary code, potentially compromising the system.
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Description OSIDB Bzimport 2026-04-06 16:03:21 UTC 
Lupa integrates the runtimes of Lua or LuaJIT2 into CPython. In 2.6 and earlier, attribute_filter is not consistently applied when attributes are accessed through built-in functions like getattr and setattr. This allows an attacker to bypass the intended restrictions and eventually achieve arbitrary code execution.