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Vulnerability · Published Apr 6, 2026 · Assigned by GitHub_M

CVE-2026-34444Lupa has a Sandbox escape and RCE due to incomplete attribute_filter enforcement in getattr / setattr

High 8.1

In plain English

A high-severity improper access control in lupa from scoder. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.6%top 49.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12python-lupano fix listedDEBIAN-CVE-2026-34444
Debian:13python-lupano fix listedDEBIAN-CVE-2026-34444
Debian:14python-lupano fix listedDEBIAN-CVE-2026-34444
PyPIlupano fix listedGHSA-69v7-xpr6-6gjm
PyPIlupano fix listedPYSEC-2026-2613
Ubuntu:22.04:LTSpython-lupano fix listedUBUNTU-CVE-2026-34444
Ubuntu:24.04:LTSpython-lupano fix listedUBUNTU-CVE-2026-34444
Ubuntu:25.10python-lupano fix listedUBUNTU-CVE-2026-34444
Ubuntu:26.04:LTSpython-lupano fix listedUBUNTU-CVE-2026-34444
Ubuntu:26.10python-lupano fix listedUBUNTU-CVE-2026-34444

Affected products (as reported)

VendorProductVersions
scoder lupa <= 2.6

Weakness: CWE-284, CWE-639, CWE-914 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References