CVE-2026-12345

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2% (6th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — Patch released this week
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
5.9
EG Score
5.9MEDIUMmedium confidence
EG Risk
27
EG Risk 27/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
6th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

October 3, 2026

Advisory Details (2)

Auto-updated Sep 29, 2026
Patch available. Sources: github_pr.
generic

Race condition in the cleanup of `tempfile.TemporaryDirectory` · Issue #157579 · python/cpython · GitHub

https://github.com/python/cpython/issues/157579
github_pr

gh-157579: Fix race condition in the cleanup of `tempfile.TemporaryDirectory`

Fix merged in python/cpython PR #157580 on 2026-09-29 — awaiting tagged release

https://github.com/python/cpython/pull/157580

Vendor Advisories for CVE-2026-12345(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatpython3-13-main-3.13.16-1.hum12026-10-03redhat
redhatpython3-12-main-3.12.15-1.hum12026-10-02redhat
redhatpython3-14-main-3.14.8-1.hum12026-10-02redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 19× in last 7d / 19× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-03 23:25 UTCEG score recompute
  2. 2026-10-03 23:25 UTCVendor advisory
  3. 2026-10-03 14:25 UTCEPSS rescore
  4. 2026-10-03 01:22 UTCEG score recompute
  5. 2026-10-03 01:22 UTCVendor advisory
  6. 2026-10-03 01:10 UTCEG score recompute
  7. 2026-10-03 01:10 UTCVendor advisory
  8. 2026-10-02 19:36 UTCEG score recompute
  9. 2026-10-01 21:33 UTCEG score recompute
  10. 2026-10-01 19:49 UTCEPSS rescore
  11. 2026-09-30 23:31 UTCEG score recompute
  12. 2026-09-30 21:18 UTCEG score recompute
  13. 2026-09-30 20:28 UTCEG score recompute
  14. 2026-09-30 15:02 UTCEPSS rescore
  15. 2026-09-29 19:21 UTCEG score recompute
  16. 2026-09-29 18:51 UTCEG score recompute
  17. 2026-09-29 18:26 UTCEG score recompute
  18. 2026-09-29 17:49 UTCEG score recompute
  19. 2026-09-29 17:48 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12345?
CVE-2026-12345 is a medium vulnerability published on September 29, 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…
When was CVE-2026-12345 disclosed?
CVE-2026-12345 was first published on September 29, 2026, with the most recent update on October 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12345 actively exploited?
CVE-2026-12345 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (6th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-12345?
CVE-2026-12345 has a CVSS base score of 5.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-12345?
A fix for CVE-2026-12345 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-12345 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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