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CVE-2025-4435VulnerabilityPublished Updated

Microsoft · Tarfile extracts filtered members when errorlevel=0

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2025-4435· High 7.5

Not known to be exploited · CVSS 7.5 High.

Data as of 31 Oct 2026, 08:20 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 49% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Jun 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
PyPIcpythonpkg:pypi/cpythonOther threatsAffected
  • 3.10.0 – 3.14.0
5 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

CVE-2025-4435 is a vulnerability in Microsoft software versions 2.0 and 3.0 where the Tarfile component extracts filtered members when errorlevel=0. This issue relates to improper handling of error conditions during archive extraction.

References

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