CVE-2026-34444: Lupa integrates the runtimes of Lua or LuaJIT2 into CPython

Q: How do I fix CVE-2026-34444?

lupa: upgrade to newer than 2.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-34444 being exploited?

CVE-2026-34444 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-34444 affect?

CVE-2026-34444 affects lupa. Severity is critical (CVSS 10.0). 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 bypas

Q: How urgent is CVE-2026-34444?

Priority 57/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 10.0REMOTEUPGRADE

CVE-2026-34444 is a critical-severity flaw (CVSS 10.0) affecting lupa. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-284, CWE-639, CWE-914
Published	2026-04-06
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: scoder

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-06 16:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

scoder lupa UPGRADE

Affected: <= 2.6

Fixed in: newer than 2.6

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show lupa

2. UPGRADE to newer than 2.6

pip install --upgrade "lupa>2.6"

Exact fixes by distribution

Python (pip) · lupa · NO FIX YET · vulnerable: <= 2.6 · source

Fedora ELN · openbao · FIXED · 2.6.5-1.eln159 · FEDORA-2026-77adf886ae · source

sudo dnf upgrade --advisory=FEDORA-2026-77adf886ae

Fedora 46 · sugar-turtleart · FIXED · 220-16.fc46 · FEDORA-2026-b79483c788 · source

sudo dnf upgrade --advisory=FEDORA-2026-b79483c788

Debian 12 · python-lupa · NO FIX YET

Debian 13 · python-lupa · NO FIX YET

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: redyank/CVE-2026-34444 (0 stars)
Write-up: github.com/scoder/lupa/security/advisories/GHSA-69v7-xpr6-6gjm

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-34444?

lupa: upgrade to newer than 2.6. Exact commands for each OS are on this page.

Is CVE-2026-34444 being exploited?

CVE-2026-34444 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-34444 affect?

CVE-2026-34444 affects lupa. Severity is critical (CVSS 10.0). 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 bypas

How urgent is CVE-2026-34444?

Priority 57/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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