CVE-2026-3087 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-3087MEDIUM

Python Software Foundation CPython — shutil.unpack_archive() doesn't check for Windows absolute paths in ZIPs

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   L   N   N   H   N    6.0   .0055   43.7     —

AFFECTED
  Product  Versions     Fixed
  CPython  unspecified  —

TIMELINE
  Feb 23  Reserved by PSF
  Apr 27  Published (CNA: PSF)
  Aug 13  EXPLOIT PUBLISHED — CVE-2026-3087 (Python Software Foundation CPython). Public exploit reference added.

CWE-22 · CNA: PSF · CVSS v4.0 · 14 references · NVD status: Modified

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
February 23, 2026	Reserved	Reserved by PSF
April 27, 2026	Published	Published (CNA: PSF)
August 13, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-3087 (Python Software Foundation CPython). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Python Software Foundation	CPython	—	—	—

Weaknesses

CWE-22

References (14)

http://www.openwall.com/lists/oss-security/2026/04/28/9 [Mailing List, Third Party Advisory]
https://github.com/python/cpython/commit/1071290169f85c09cf767c1099564a9426cdc7e8
https://github.com/python/cpython/commit/65b255416ae217bf0e22085be3c1976cea18bd8c [Patch]
https://github.com/python/cpython/commit/7ef7dd0a74f47facd1fadcbc77f8fb03beb5eb4d
https://github.com/python/cpython/commit/8e13025747e1ca72e86d1f35637123f9c306f0cb [Patch]
https://github.com/python/cpython/commit/8ee6aff14054b37b53e47194a2fa313e98163c94 [Patch]
https://github.com/python/cpython/commit/a6650a2cdf0c49fb8ce0c982903aa2aa274beefe
https://github.com/python/cpython/commit/ab5ef98af693bded74a738570e81ea70abef2840 [Patch]
https://github.com/python/cpython/commit/b01e594fbe754a960212f908d047294e880b52fd [Patch]
https://github.com/python/cpython/commit/ba0aca3bffce431fe2fbd53ca4cd6a717a2e2c19 [Patch]
https://github.com/python/cpython/commit/fc829e88753858c8ac669594bf0093f44948c0f4 [Patch]
https://github.com/python/cpython/issues/146581 [Exploit, Issue Tracking, Patch, Vendor Advisory]
https://github.com/python/cpython/pull/146591 [Issue Tracking, Patch]
https://mail.python.org/archives/list/security-announce@python.org/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/ [Mailing List, Vendor Advisory]

Authoritative record: CVE-2026-3087 at cve.org

Vendors: python software foundation

Weaknesses: CWE-22

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-3087 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.