Vulnerability in Python Software Foundation Cpython
CVE-2025-4435
When using a TarFile.errorlevel = 0 and extracting with a filter the documented behavior is that any filtered members would be skipped and not extracted. However the actual behavior of TarFile.errorlevel = 0 in affected versions is that the member would still be extracted and not skipped.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.006 (46.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.000
Affected products
- Python Software Foundation Cpython — versions 3.10.0, 0, 3.14.0a1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/python/cpython/issues/135034 (issue-tracking)
- github.com/python/cpython/pull/135037 (patch)
- mail.python.org/archives/list/security-announce@python.org/thread/MAXIJJCUUMCL7… (vendor-advisory)
- github.com/python/cpython/commit/3612d8f51741b11f36f8fb0494d79086bac9390a (patch)
- github.com/python/cpython/commit/9e0ac76d96cf80b49055f6d6b9a6763fb9215c2a (patch)
- github.com/python/cpython/commit/19de092debb3d7e832e5672cc2f7b788d35951da (patch)
- github.com/python/cpython/commit/aa9eb5f757ceff461e6e996f12c89e5d9b583b01 (patch)
- github.com/python/cpython/commit/28463dba112af719df1e8b0391c46787ad756dd9 (patch)
- github.com/python/cpython/commit/4633f3f497b1ff70e4a35b6fe2c907cbe2d4cb2e (patch)
- github.com/python/cpython/commit/9c1110ef6652687d7c55f590f909720eddde965a (patch)
Frequently asked questions
- What is CVE-2025-4435?
- CVE-2025-4435 is a high-severity vulnerability in Python Software Foundation Cpython, classified under Incorrect Calculation. CVSS score: 7.5/10. Published 2025-06-03.
- How severe is CVE-2025-4435?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-4435 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.