CVE-2026-12345

MEDIUMPre-NVD 5.95.9
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (27th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-89183 (ENISA EUVD)Source: ENISA EUVD

5.9EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%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 27/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity59% × 45%
Impact severity (EG Severity): CVSS 5.9 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
27th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (5.9): severity, escalated by confirmed exploitation. This CVE's 5.9 is its impact severity (EG Severity), not escalated.

EG Severity
5.9 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 29, 2026

Last Modified

October 26, 2026

Advisory Details (2)

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

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

https://github.com/python/cpython/issues/157579
GitHub pull request

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(6)

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

Patch Availability(5)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatpython3.9-0:3.9.25-7.el9_8.62026-10-26redhat
redhatpython3-0:3.6.8-79.el8_102026-10-19redhat
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.

Affected Packages

(8 across 3 ecosystems)
Debian:14(4)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.19+dfsg-2 ... 8.0.0+dfsg-1 (13 versions)
  • every version on: no fix on record
—
python3.133.13.11-1 ... 3.13.9-1 (9 versions)
  • every version on: no fix on record
—
python3.143.14.0-1 ... 3.14.8-1 (30 versions)
  • every version on: no fix on record
—
python3.153.15.0-1 ... 3.15.0~rc3-2 (15 versions)
  • every version on: no fix on record
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.11+dfsg-2 ... 8.0.0+dfsg-1 (31 versions)
  • every version on: no fix on record
—
python3.113.11.2-6 ... 3.11.9-1 (29 versions)
  • every version on: no fix on record
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
pypy37.3.19+dfsg-2 ... 8.0.0+dfsg-1 (13 versions)
  • every version on: no fix on record
—
python3.133.13.11-1 ... 3.13.9-1 (14 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 65× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  2. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  3. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  4. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  5. 2026-10-29 15:52 UTCEG score recompute
  6. 2026-10-29 15:52 UTCVendor advisory
  7. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  8. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  9. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  10. 2026-10-26 01:26 UTCEG score recompute
  11. 2026-10-26 01:26 UTCVendor advisory
  12. 2026-10-26 01:16 UTCEG score recompute
  13. 2026-10-26 01:16 UTCVendor advisory
  14. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  15. 2026-10-25 14:49 UTCEG score recompute
  16. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  17. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  18. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  19. 2026-10-22 01:27 UTCEG score recompute
  20. 2026-10-22 01:27 UTCVendor advisory
  21. 2026-10-22 00:52 UTCEG score recompute
  22. 2026-10-22 00:52 UTCVendor advisory
  23. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  24. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  25. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.2% · 7th percentile
Show 56 more
  1. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  2. 2026-10-18 05:04 UTCEG score recompute
  3. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  4. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  5. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  6. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  7. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  8. 2026-10-12 16:36 UTCEG score recompute
  9. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  10. 2026-10-11 21:23 UTCVendor advisory
  11. 2026-10-11 20:12 UTCEG score recompute
  12. 2026-10-11 18:24 UTCEG score recompute
  13. 2026-10-11 14:58 UTCEG score recompute
  14. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  15. 2026-10-10 23:20 UTCEG score recompute
  16. 2026-10-10 23:20 UTCVendor advisory
  17. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  18. 2026-10-10 01:18 UTCEG score recompute
  19. 2026-10-10 01:18 UTCVendor advisory
  20. 2026-10-10 01:15 UTCEG score recompute
  21. 2026-10-10 01:15 UTCVendor advisory
  22. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  23. 2026-10-09 14:02 UTCEG score recompute
  24. 2026-10-09 14:02 UTCVendor advisory
  25. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  26. 2026-10-08 15:55 UTCEG score recompute
  27. 2026-10-08 15:55 UTCVendor advisory
  28. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  29. 2026-10-07 16:24 UTCVendor advisory
  30. 2026-10-06 17:31 UTCEG score recompute
  31. 2026-10-06 17:31 UTCVendor advisory
  32. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  33. 2026-10-05 19:29 UTCEG score recompute
  34. 2026-10-05 19:29 UTCVendor advisory
  35. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  36. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  37. 2026-10-04 21:27 UTCVendor advisory
  38. 2026-10-03 23:25 UTCEG score recompute
  39. 2026-10-03 23:25 UTCVendor advisory
  40. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  41. 2026-10-03 01:22 UTCEG score recompute
  42. 2026-10-03 01:22 UTCVendor advisory
  43. 2026-10-03 01:10 UTCEG score recompute
  44. 2026-10-03 01:10 UTCVendor advisory
  45. 2026-10-02 19:36 UTCEG score recompute
  46. 2026-10-01 21:33 UTCEG score recompute
  47. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  48. 2026-09-30 23:31 UTCEG score recompute
  49. 2026-09-30 21:18 UTCEG score recompute
  50. 2026-09-30 20:28 UTCEG score recompute
  51. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  52. 2026-09-29 19:21 UTCEG score recompute
  53. 2026-09-29 18:51 UTCEG score recompute
  54. 2026-09-29 18:26 UTCEG score recompute
  55. 2026-09-29 17:49 UTCEG score recomputeFirst assessed: 5.9 MEDIUM
  56. 2026-09-29 17:48 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same vendor + same CWE)

Same vendor

2 shown

redhat:RHSA-2026:85239

Frequently asked(5)

What is CVE-2026-12345?
CVE-2026-12345 is a medium-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-12345 published?
The CVE record for CVE-2026-12345 was published on September 29, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-12345 actively exploited?
CVE-2026-12345 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (27th 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.

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