CVE-2026-34444

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

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

scoder · lupa

CVSS v4.0 GITHUB

7.9 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/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

CVSS v4.0 GitHub

7.9 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H

CVSS v3.1 NVD

10.0 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 CNA

8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.80% chance of exploitation in the next 30 days, 56th percentile

Published

2026-04-06

Updated

2026-07-15

Proof-of-concept exploits (1)

• advisories/GHSA-69v7-xpr6-6gjm

Security advisories

• scoder/lupa/security/advisories/GHSA-69v7-xpr6-6gjm

References

• CVE Record
• NVD entry