CVE-2026-3087

CVE-2026-3087 is a high-severity vulnerability in Python with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• CVSS v4: 6.0
• EPSS exploit prediction: 1% (41st percentile)
• Actively exploited: Not listed in CISA KEV
• EU (EUVD) id: EUVD-2026-25922
• Weakness: CWE-22
• Affected product: Python
• Published: 2026-04-27
• Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-3087?

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.

How severe is CVE-2026-3087?

CVE-2026-3087 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-3087 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3087?

CVE-2026-3087 primarily affects Python. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-3087?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-3087 have an EU (EUVD) identifier?

Yes. CVE-2026-3087 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25922.

When was CVE-2026-3087 published?

CVE-2026-3087 was published on 2026-04-27 and last updated on 2026-06-17.

References

• https://github.com/python/cpython/commit/65b255416ae217bf0e22085be3c1976cea18bd8c
• https://github.com/python/cpython/commit/8e13025747e1ca72e86d1f35637123f9c306f0cb
• https://github.com/python/cpython/commit/8ee6aff14054b37b53e47194a2fa313e98163c94
• https://github.com/python/cpython/commit/ab5ef98af693bded74a738570e81ea70abef2840
• https://github.com/python/cpython/commit/b01e594fbe754a960212f908d047294e880b52fd
• https://github.com/python/cpython/commit/ba0aca3bffce431fe2fbd53ca4cd6a717a2e2c19
• https://github.com/python/cpython/commit/fc829e88753858c8ac669594bf0093f44948c0f4
• https://github.com/python/cpython/issues/146581
• https://github.com/python/cpython/pull/146591
• https://mail.python.org/archives/list/[email protected]/thread/X6FXE5C6KDKOVNX3EC3DWD5RUPFWOZA4/
• http://www.openwall.com/lists/oss-security/2026/04/28/9

Affected products (9)

• cpe:2.3:a:python:python:*:*:*:*:*:*:*:*
• cpe:2.3:a:python:python:3.15.0:alpha1:*:*:*:*:*:*
• cpe:2.3:a:python:python:3.15.0:alpha2:*:*:*:*:*:*
• cpe:2.3:a:python:python:3.15.0:alpha3:*:*:*:*:*:*
• cpe:2.3:a:python:python:3.15.0:alpha4:*:*:*:*:*:*
• cpe:2.3:a:python:python:3.15.0:alpha5:*:*:*:*:*:*
• cpe:2.3:a:python:python:3.15.0:alpha6:*:*:*:*:*:*
• cpe:2.3:a:python:python:3.15.0:alpha7:*:*:*:*:*:*
• cpe:2.3:a:python:python:3.15.0:alpha8:*:*:*:*:*:*

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Other CWE-22 (Path Traversal) vulnerabilities

• CVE-2026-48282 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Limitation of a Pathname to a Restricted…
• CVE-2026-54917 — Critical (CVSS 10.0): SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables. Prior to 4.30, the…
• CVE-2026-11429 — Critical (CVSS 10.0): Two endpoints in the Vault Service ScriptsController, shared by Altium Enterprise Server and Altium 365, accept file…
• CVE-2026-34909 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to…
• CVE-2026-7411 — Critical (CVSS 10.0): In Eclipse BaSyx Java Server SDK versions prior to 2.0.0-milestone-10, inadequate path normalization in the Submodel…
• CVE-2026-36767 — Critical (CVSS 10.0): A path traversal vulnerability in the /content/images/add endpoint of shopizer v3.2.5 allows attackers write arbitrary…

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Threat intelligence

Threat-intel indicators referencing this CVE:

• 41.63.62.103 (ipv4-addr)
• 203.192.232.180 (ipv4-addr)
• 149.86.233.213 (ipv4-addr)
• 141.109.168.26 (ipv4-addr)
• 141.109.168.107 (ipv4-addr)
• 125.212.235.194 (ipv4-addr)
• 120.28.109.188 (ipv4-addr)
• 103.61.123.132 (ipv4-addr)