CVE-2026-2297 SourcelessFileLoader does not use io.open_code()
Attackers can bypass sys.audit security monitoring when loading legacy .pyc files because the loader fails to trigger the required audit event.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-2297?
CVE-2026-2297 is a medium-severity vulnerability in CPython, published on 4 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The import hook in CPython that handles legacy *.pyc files (SourcelessFileLoader) is incorrectly handled in FileLoader (a base class) and so does not use io.open_code() to read the .pyc files. sys.audit handlers for this audit event therefore do not fire.
Weakness: CWE-668
Which versions are affected by CVE-2026-2297?
Linux distribution packages (7)
python39 openSUSE:Leap 15.6 | All versions | 3.9.25-150300.4.96.1 |
python39-core openSUSE:Leap 15.6 | All versions | 3.9.25-150300.4.96.1 |
python39-documentation openSUSE:Leap 15.6 | All versions | 3.9.25-150300.4.96.1 |
python311 openSUSE:Tumbleweed | All versions | 3.11.15-2.1 |
python312 openSUSE:Tumbleweed | All versions | 3.12.13-2.1 |
python313 openSUSE:Tumbleweed | All versions | 3.13.12-2.1 |
python314 openSUSE:Tumbleweed | All versions | 3.14.3-3.1 |
How do I fix CVE-2026-2297?
Apply the vendor's patch.
Is CVE-2026-2297 being exploited?
There is no known exploitation of CVE-2026-2297 in the wild and no public exploit code.
Sources
Also known as ALPINE-CVE-2026-2297, AZL-79413, AZL-79457, AZL-79491, BELL-CVE-2026-2297, DEBIAN-CVE-2026-2297 and 14 more.