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

23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete
23 Oct 2026 · 08:31:50 UTC Source coverage: msrc-cvrfCurrent → Incomplete

Show 5 more recent changes

18 Oct 2026 · 14:54:30 UTCLink: September 2026 → /security?release=2026-Sep#cves
16 Oct 2026 · 07:41:54 UTCLast revised 6 Oct 2026 03:52 UTC → 16 Oct 2026 01:49 UTC
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
16 Oct 2026 · 07:41:54 UTCSeverity Moderate → Low
14 Oct 2026 · 11:22:42 UTCSource coverage: msrc-cvrf Incomplete → Current

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cve-program · CVE-2026-12345

Published

CPython

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "defaultStatus": "unaffected",
                    "modules": [
                        "tempfile"
                    ],
                    "product": "CPython",
                    "repo": "https://github.com/python/cpython",
                    "vendor": "Python Software Foundation",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "3.12.15",
                            "status": "affected",
                            "versionType": "python"
                        },
                        {
                            "version": "3.13.0",
                            "lessThan": "3.13.18",
                            "status": "affected",
                            "versionType": "python"
                        },
                        {
                            "version": "3.14.0",
                            "lessThan": "3.14.9",
                            "status": "affected",
                            "versionType": "python"
                        },
                        {
                            "version": "3.15.0a1",
                            "lessThan": "3.15.0rc3",
                            "status": "affected",
                            "versionType": "python"
                        }
                    ]
                }