CVE-2026-3087

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory published 2026-04-27. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

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

If shutil.unpack_archive() is given a ZIP archive with an absolute Windows path containing a drive (C:\\...) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

April 27, 2026

Last Modified

August 13, 2026

Advisory Details (10)

Auto-updated Jun 5, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit, github_pr.
generic

Mailman 3 [CVE-2026-3087] shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs - Security-announce - python.org

https://mail.python.org/archives/list/[email protected]/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/
github_pr

gh-146581: Fix vulnerability in shutil.unpack_archive() for ZIP files on Windows

Fix merged in python/cpython PR #146591 on 2026-04-27 — awaiting tagged release

https://github.com/python/cpython/pull/146591
generic

shutil.unpack_archive() on Windows writes outside extract_dir for ZIP entries with drive-prefixed names · Issue #146581 · python/cpython · GitHub

https://github.com/python/cpython/issues/146581
github_commit

commit fc829e887538 (python/cpython)

Fix landed in python/cpython commit fc829e887538 — awaiting tagged release

https://github.com/python/cpython/commit/fc829e88753858c8ac669594bf0093f44948c0f4
github_commit

commit ba0aca3bffce (python/cpython)

Fix landed in python/cpython commit ba0aca3bffce — awaiting tagged release

https://github.com/python/cpython/commit/ba0aca3bffce431fe2fbd53ca4cd6a717a2e2c19
github_commit

commit b01e594fbe75 (python/cpython)

Fix landed in python/cpython commit b01e594fbe75 — awaiting tagged release

https://github.com/python/cpython/commit/b01e594fbe754a960212f908d047294e880b52fd
github_commit

commit ab5ef98af693 (python/cpython)

Fix landed in python/cpython commit ab5ef98af693 — awaiting tagged release

https://github.com/python/cpython/commit/ab5ef98af693bded74a738570e81ea70abef2840
github_commit

commit 8ee6aff14054 (python/cpython)

Fix landed in python/cpython commit 8ee6aff14054 — awaiting tagged release

https://github.com/python/cpython/commit/8ee6aff14054b37b53e47194a2fa313e98163c94
github_commit

commit 8e13025747e1 (python/cpython)

Fix landed in python/cpython commit 8e13025747e1 — awaiting tagged release

https://github.com/python/cpython/commit/8e13025747e1ca72e86d1f35637123f9c306f0cb
github_commit

commit 65b255416ae2 (python/cpython)

Fix landed in python/cpython commit 65b255416ae2 — awaiting tagged release

https://github.com/python/cpython/commit/65b255416ae217bf0e22085be3c1976cea18bd8c

Vendor Advisories for CVE-2026-3087(2)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 30× 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.

Showing the most recent 100 of 225 total refreshes for this CVE.

  1. 2026-09-15 03:11 UTCEPSS rescore
  2. 2026-09-13 16:47 UTCEPSS rescore
  3. 2026-09-12 15:01 UTCEPSS rescore
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 09:37 UTCEPSS rescore
  6. 2026-09-10 09:34 UTCEPSS rescore
  7. 2026-09-08 22:00 UTCEPSS rescore
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-04 05:06 UTCEPSS rescore
  11. 2026-09-04 01:46 UTCOSV refresh
  12. 2026-09-02 14:12 UTCEPSS rescore
  13. 2026-09-01 13:53 UTCEPSS rescore
  14. 2026-09-01 04:39 UTCEPSS rescore
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-28 21:41 UTCEPSS rescore
  18. 2026-08-27 14:25 UTCEPSS rescore
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-25 13:49 UTCEPSS rescore
  21. 2026-08-23 00:19 UTCEPSS rescore
  22. 2026-08-21 23:49 UTCEPSS rescore
  23. 2026-08-20 22:55 UTCEPSS rescore
  24. 2026-08-19 17:03 UTCEPSS rescore
  25. 2026-08-18 13:48 UTCEPSS rescore
Show 75 more
  1. 2026-08-17 14:01 UTCEG score recompute
  2. 2026-08-17 14:01 UTCVendor advisory
  3. 2026-08-17 14:01 UTCGHSA enrichment
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-16 14:56 UTCEPSS rescore
  6. 2026-08-16 05:36 UTCEG score recompute
  7. 2026-08-16 05:36 UTCVendor advisory
  8. 2026-08-16 05:36 UTCGHSA enrichment
  9. 2026-08-16 02:14 UTCEPSS rescore
  10. 2026-08-15 01:40 UTCEG score recompute
  11. 2026-08-15 01:40 UTCVendor advisory
  12. 2026-08-15 01:40 UTCGHSA enrichment
  13. 2026-08-15 01:30 UTCEPSS rescore
  14. 2026-08-14 14:50 UTCVendor advisory
  15. 2026-08-14 14:50 UTCGHSA enrichment
  16. 2026-08-14 04:00 UTCEG score recompute
  17. 2026-08-14 04:00 UTCVendor advisory
  18. 2026-08-14 04:00 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 01:23 UTCGHSA enrichment
  21. 2026-08-13 00:41 UTCGHSA enrichment
  22. 2026-08-12 17:41 UTCEG score recompute
  23. 2026-08-12 17:41 UTCVendor advisory
  24. 2026-08-12 17:41 UTCGHSA enrichment
  25. 2026-08-12 13:51 UTCEPSS rescore
  26. 2026-08-11 16:38 UTCEG score recompute
  27. 2026-08-11 16:38 UTCVendor advisory
  28. 2026-08-11 16:38 UTCGHSA enrichment
  29. 2026-08-11 13:43 UTCEPSS rescore
  30. 2026-08-11 02:21 UTCEG score recompute
  31. 2026-08-11 02:21 UTCVendor advisory
  32. 2026-08-11 02:21 UTCGHSA enrichment
  33. 2026-08-11 00:00 UTCEPSS rescore
  34. 2026-08-10 15:31 UTCGHSA enrichment
  35. 2026-08-10 14:35 UTCGHSA enrichment
  36. 2026-08-10 12:09 UTCGHSA enrichment
  37. 2026-08-10 01:20 UTCGHSA enrichment
  38. 2026-08-10 00:31 UTCGHSA enrichment
  39. 2026-08-09 14:00 UTCEG score recompute
  40. 2026-08-09 14:00 UTCGHSA enrichment
  41. 2026-08-09 13:46 UTCEPSS rescore
  42. 2026-08-09 03:11 UTCEG score recompute
  43. 2026-08-09 03:11 UTCGHSA enrichment
  44. 2026-08-08 16:37 UTCEPSS rescore
  45. 2026-08-08 10:02 UTCGHSA enrichment
  46. 2026-08-07 23:12 UTCEG score recompute
  47. 2026-08-07 23:12 UTCGHSA enrichment
  48. 2026-08-07 12:23 UTCGHSA enrichment
  49. 2026-08-06 20:30 UTCEG score recompute
  50. 2026-08-06 20:30 UTCGHSA enrichment
  51. 2026-08-06 13:46 UTCEPSS rescore
  52. 2026-08-06 09:38 UTCGHSA enrichment
  53. 2026-08-05 22:48 UTCEG score recompute
  54. 2026-08-05 22:48 UTCGHSA enrichment
  55. 2026-08-05 19:17 UTCEPSS rescore
  56. 2026-08-05 01:19 UTCEG score recompute
  57. 2026-08-05 01:19 UTCGHSA enrichment
  58. 2026-08-05 01:18 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  59. 2026-08-05 00:51 UTCEG score recompute
  60. 2026-08-05 00:51 UTCGHSA enrichment
  61. 2026-08-04 15:10 UTCEPSS rescore
  62. 2026-08-04 10:38 UTCEPSS rescore
  63. 2026-08-03 20:52 UTCEG score recompute
  64. 2026-08-03 20:52 UTCGHSA enrichment
  65. 2026-08-03 10:36 UTCEPSS rescore
  66. 2026-08-02 21:01 UTCGHSA enrichment
  67. 2026-08-02 10:12 UTCEG score recompute
  68. 2026-08-02 10:12 UTCGHSA enrichment
  69. 2026-08-02 02:27 UTCEPSS rescore
  70. 2026-08-01 04:16 UTCEPSS rescore
  71. 2026-07-30 16:28 UTCEPSS rescore
  72. 2026-07-30 01:30 UTCEPSS rescore
  73. 2026-07-27 14:13 UTCEPSS rescore
  74. 2026-07-26 14:54 UTCEPSS rescore
  75. 2026-07-26 14:54 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-3087?
CVE-2026-3087 is a high vulnerability published on April 27, 2026. If shutil.unpack_archive() is given a ZIP archive with an absolute Windows path containing a drive (C:\\...) then the archive will be extracted outside the target directory which is different than other operating systems. Only Windows is affected by this vulnerability.
When was CVE-2026-3087 disclosed?
CVE-2026-3087 was first published in the National Vulnerability Database on April 27, 2026, with the most recent update on August 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-3087 actively exploited?
CVE-2026-3087 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 55.6% of all scored CVEs.
What is the CVSS score of CVE-2026-3087?
CVE-2026-3087 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-3087?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3087, 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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