CVE-2026-11940

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 54% of all CVEs by exploit prediction. 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
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself.  The extraction fallback validated the symlink at it's archived location but recreated it at the hardlink's shallower path, letting a relative target the filter judged contained escape the destination directory.  This allowed a malicious tar archive to create a symlink pointing outside the destination, enabling out-of-destination file reads or writes. This was an incomplete fix of CVE-2025-4330.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

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
Severity78% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
45.7%
KEV
Not listed

Published

June 23, 2026

Last Modified

July 23, 2026

Advisory Details (3)

Auto-updated Jun 23, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

Mailman 3 [CVE-2026-11940] tarfile extraction filter bypass allows escaping the destination directory - Security-announce - python.org

https://mail.python.org/archives/list/security-announce@python.org/thread/LD6QIISNQFQYOIEPJNEUIPV7S3V76FZH/
github_pr

gh-151558: Fix symlink escape via `tarfile` hardlink-extraction fallback

Fix merged in python/cpython PR #151559 on 2026-06-23 — awaiting tagged release

https://github.com/python/cpython/pull/151559
generic

`tarfile.extractall(filter='data')` allows symlink escape through hardlink-extraction fallback · Issue #151558 · python/cpython · GitHub

https://github.com/python/cpython/issues/151558

Vendor Advisories for CVE-2026-11940(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 79× 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. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 03:05 UTCEG score recompute
  3. 2026-07-22 14:08 UTCEPSS rescore
  4. 2026-07-21 15:24 UTCEPSS rescore
  5. 2026-07-20 17:08 UTCEPSS rescore
  6. 2026-07-19 14:30 UTCEPSS rescore
  7. 2026-07-19 02:28 UTCEPSS rescore
  8. 2026-07-18 10:04 UTCEPSS rescore
  9. 2026-07-16 18:58 UTCGHSA enrichment
  10. 2026-07-16 17:02 UTCEPSS rescore
  11. 2026-07-16 07:00 UTCGHSA enrichment
  12. 2026-07-15 18:11 UTCGHSA enrichment
  13. 2026-07-15 16:57 UTCEPSS rescore
  14. 2026-07-15 06:14 UTCGHSA enrichment
  15. 2026-07-15 02:00 UTCEPSS rescore
  16. 2026-07-14 17:39 UTCGHSA enrichment
  17. 2026-07-14 05:41 UTCGHSA enrichment
  18. 2026-07-13 22:30 UTCEPSS rescore
  19. 2026-07-13 17:43 UTCGHSA enrichment
  20. 2026-07-13 06:12 UTCEPSS rescore
  21. 2026-07-13 05:45 UTCGHSA enrichment
  22. 2026-07-12 17:47 UTCGHSA enrichment
  23. 2026-07-12 05:48 UTCGHSA enrichment
  24. 2026-07-12 05:46 UTCEPSS rescore
  25. 2026-07-11 17:51 UTCGHSA enrichment
Show 57 more
  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-11 05:53 UTCGHSA enrichment
  3. 2026-07-10 17:55 UTCGHSA enrichment
  4. 2026-07-10 05:56 UTCGHSA enrichment
  5. 2026-07-09 19:10 UTCEPSS rescore
  6. 2026-07-09 17:58 UTCGHSA enrichment
  7. 2026-07-09 05:59 UTCGHSA enrichment
  8. 2026-07-08 17:58 UTCGHSA enrichment
  9. 2026-07-08 15:15 UTCEPSS rescore
  10. 2026-07-08 15:15 UTCEPSS rescore
  11. 2026-07-08 05:59 UTCGHSA enrichment
  12. 2026-07-07 18:02 UTCGHSA enrichment
  13. 2026-07-07 13:46 UTCEPSS rescore
  14. 2026-07-07 05:35 UTCGHSA enrichment
  15. 2026-07-06 17:36 UTCGHSA enrichment
  16. 2026-07-06 16:27 UTCEPSS rescore
  17. 2026-07-06 05:22 UTCGHSA enrichment
  18. 2026-07-06 02:23 UTCEPSS rescore
  19. 2026-07-05 17:23 UTCGHSA enrichment
  20. 2026-07-05 05:26 UTCGHSA enrichment
  21. 2026-07-05 02:30 UTCEPSS rescore
  22. 2026-07-05 02:30 UTCEPSS rescore
  23. 2026-07-04 17:26 UTCGHSA enrichment
  24. 2026-07-04 06:31 UTCEPSS rescore
  25. 2026-07-04 05:29 UTCGHSA enrichment
  26. 2026-07-03 17:29 UTCGHSA enrichment
  27. 2026-07-03 05:31 UTCGHSA enrichment
  28. 2026-07-02 17:23 UTCGHSA enrichment
  29. 2026-07-02 05:24 UTCGHSA enrichment
  30. 2026-07-01 17:25 UTCGHSA enrichment
  31. 2026-07-01 15:06 UTCEPSS rescore
  32. 2026-07-01 15:06 UTCEPSS rescore
  33. 2026-07-01 05:28 UTCGHSA enrichment
  34. 2026-06-30 23:22 UTCEPSS rescore
  35. 2026-06-30 17:30 UTCGHSA enrichment
  36. 2026-06-30 05:32 UTCGHSA enrichment
  37. 2026-06-29 17:31 UTCGHSA enrichment
  38. 2026-06-29 14:06 UTCEPSS rescore
  39. 2026-06-29 05:31 UTCGHSA enrichment
  40. 2026-06-28 17:32 UTCGHSA enrichment
  41. 2026-06-28 14:07 UTCEPSS rescore
  42. 2026-06-28 05:33 UTCGHSA enrichment
  43. 2026-06-28 04:56 UTCEPSS rescore
  44. 2026-06-28 04:56 UTCEPSS rescore
  45. 2026-06-27 17:34 UTCGHSA enrichment
  46. 2026-06-27 05:36 UTCGHSA enrichment
  47. 2026-06-27 03:08 UTCEPSS rescore
  48. 2026-06-26 17:38 UTCGHSA enrichment
  49. 2026-06-26 05:39 UTCGHSA enrichment
  50. 2026-06-25 17:41 UTCGHSA enrichment
  51. 2026-06-25 13:49 UTCEPSS rescore
  52. 2026-06-25 05:43 UTCGHSA enrichment
  53. 2026-06-24 17:46 UTCGHSA enrichment
  54. 2026-06-24 14:05 UTCEPSS rescore
  55. 2026-06-24 05:39 UTCGHSA enrichment
  56. 2026-06-23 17:34 UTCEG score recompute
  57. 2026-06-23 17:33 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-11940?
CVE-2026-11940 is a high vulnerability published on June 23, 2026. tarfile.extractall() with the 'data' or 'tar' filter could be bypassed by a crafted archive where a hardlink references a symlink stored at a deeper name than the hardlink itself. The extraction fallback validated the symlink at it's archived location but recreated it at the hardlink's shallower…
When was CVE-2026-11940 disclosed?
CVE-2026-11940 was first published in the National Vulnerability Database on June 23, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11940 actively exploited?
CVE-2026-11940 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 45.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-11940?
CVE-2026-11940 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-11940?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-11940, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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