CVE catalog

CVE-2026-12345

The cleanup of tempfile.TemporaryDirectory is vulnerable to a race condition. An attacker who can modify the tree during cleanup can replace a directory with a symbolic link, causing files outside of

[CVE catalog]

Severity: Medium · CVSS 6.3CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H
Published: Sep 29, 2026, 5:46:01 PM UTC
Updated: Sep 29, 2026, 6:17:14 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.18% · Oct 22, 2026

The cleanup of tempfile.TemporaryDirectory is vulnerable to a race condition. An attacker who can modify the tree during cleanup can replace a directory with a symbolic link, causing files outside of the temporary directory to be deleted or have their permissions and file flags reset, with the privileges of the process performing the cleanup. Note that platforms where shutil.rmtree.avoids_symlink_attacks is false, remain affected, and file flags may still be reset outside of the tree on all platforms.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	pypy3	sid	`8.0.1+dfsg-1`	vulnerable
Debian	pypy3	forky	`8.0.1+dfsg-1`	vulnerable
Debian	pypy3	trixie	`7.3.19+dfsg-2`	vulnerable
Debian	pypy3	bookworm	`7.3.11+dfsg-2+deb12u3`	vulnerable
Debian	python3.11	bookworm	`3.11.2-6+deb12u8`	vulnerable
Debian	python3.11	bookworm-security	`3.11.2-6+deb12u9`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	pypy3	source	sid	`(unfixed)`	not yet assigned	Not reported	[1150804]
Debian	pypy3	source	forky	`(unfixed)`	not yet assigned	Not reported	[1150804]
Debian	pypy3	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1150804]
Debian	pypy3	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1150804]
Debian	python3.11	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported

[Debian bug #1150804]

Notes

[trixie] pypy3: Minor issue [bookworm] pypy3: Minor issue [bookworm] python3.11: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[idle-python3.11]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · all · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[libpython3.11]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[libpython3.11-dbg]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[libpython3.11-dev]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[libpython3.11-minimal]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[libpython3.11-stdlib]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[libpython3.11-testsuite]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · all · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[pypy3]Affected
Details (2)
- 7.3.11+dfsg-2+deb12u3 · amd64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
- 7.3.11+dfsg-2+deb12u3 · arm64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
[pypy3-dev]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
[pypy3-doc]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
[pypy3-lib]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · amd64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
- 7.3.11+dfsg-2+deb12u3 · arm64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
[pypy3-lib-testsuite]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
[pypy3-tk]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · amd64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
- 7.3.11+dfsg-2+deb12u3 · arm64 · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
[pypy3-venv]Affected
Source package: [pypy3]
Details (2)
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
- 7.3.11+dfsg-2+deb12u3 · all · bookworm
  Affected
  nvd · pypy3 · debian · bookworm
[python3.11]Affected
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[python3.11-dbg]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[python3.11-dev]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[python3.11-doc]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · all · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[python3.11-examples]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · all · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · all · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · all · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
[python3.11-full]Affected
Source package: [python3.11]
Details (4)
- 3.11.2-6+deb12u8 · amd64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u8 · arm64 · bookworm
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · amd64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm
- 3.11.2-6+deb12u3 · arm64 · bookworm-security
  Affected
  nvd · python3.11 · debian · bookworm

Next results

Observed: Oct 23, 2026, 7:47:19 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]