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CVE-2026-12345LowRevised 16 Oct

Race condition in tempfile.TemporaryDirectory cleanup allows deleting files outside the temporary directory

MSRC advisory NVD CVE.org

Assessment

Severity
Low
CVSS base score
Not published
Impact
Not stated
EPSS, next 30 days
Not scored yet
Public exploit code
No Nuclei template lists it
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Required: apply the update
Component
Mariner
Weakness
CWE-59: Improper Link Resolution Before File Access ('Link Following')
Issued by
PSF
Published
3 Oct 2026 · September 2026
Last revised
16 Oct 2026Information published.

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

1 affected product
  • azl3 python3 3.12.14-2 on Azure Linux 3.0

What changed

First observed 14 Oct 2026
  1. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  2. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
  3. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
  4. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
  5. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  6. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
  7. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  8. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  9. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
  10. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
  11. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
  12. 23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete
Show 5 more recent changes
  1. 18 Oct 2026 · 14:54:30 UTCLink: September 2026 → /security?release=2026-Sep#cves
  2. 16 Oct 2026 · 07:41:54 UTCLast revised 6 Oct 2026 03:52 UTC → 16 Oct 2026 01:49 UTC
  3. 16 Oct 2026 · 07:41:54 UTCAffected products azl3 python3 3.12.14-2 on Azure Linux 3.0, azl3 tensorflow 2.16.1-11 on Azure Linux 3.0 → azl3 python3 3.12.14-2 on Azure Linux 3.0
  4. 16 Oct 2026 · 07:41:54 UTCSeverity Moderate → Low
  5. 14 Oct 2026 · 11:22:42 UTCSource coverage: msrc-cvrf Incomplete → Current

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Explore global source statements, affected packages and advisory history for CVE-2026-12345. The catalog has a separate collection scope from Microsoft release records.

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-12345

Published

Race condition in tempfile.TemporaryDirectory cleanup allows deleting files outside the temporary directory

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.

Source published
29 Sep 2026 17:46:01 UTC
Source modified
26 Oct 2026 00:36:23 UTC
Observed here
26 Oct 2026 02:35:10 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 5.9 CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 26 Oct 10:17 UTC · 272 of 272 readable · 270 fully read · documentation 467/469 current

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