🛡️ CVE-2025-4517 on Debian — pypy3
Description
Allows arbitrary filesystem writes outside the extraction directory during extraction with filter="data". You are affected by this vulnerability if using the tarfile module to extract untrusted tar archives using TarFile.extractall() or TarFile.extract() using the filter= parameter with a value of "data" or "tar". See the tarfile extraction filters documentation https://docs.python.org/3/library/tarfile.html#tarfile-extraction-filter for more information. Note that for Python 3.14 or later the default value of filter= changed from "no filtering" to `"data", so if you are relying on this new default behavior then your usage is also affected. Note that none of these vulnerabilities significantly affect the installation of source distributions which are tar archives as source distributions already allow arbitrary code execution during the build process. However when evaluating source distributions it's important to avoid installing source distributions with suspicious links.
Distribution advisory
This page covers CVE-2025-4517 as tracked by Debian, for the package pypy3. The fix is available in version 7.3.20+dfsg-2; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability low.
Affected software
DEBIAN-CVE-2025-4517 is recorded against 2 packages.
- pypy3 (fixed in 7.3.20+dfsg-2)
- python3.13 (fixed in 3.13.4-1)
Timeline and source
Published on 3 June 2025 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
CVE-2025-4517 on other distributions
Each distribution ships its own build and its own fixed version. Pick the one you run:
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| pypy3 | — | 7.3.20+dfsg-2 |
| python3.13 | — | 3.13.4-1 |
References
Similar Threats
- Unknown DEBIAN-CVE-2024-11168
- Unknown DEBIAN-CVE-2024-0397
- Unknown DEBIAN-CVE-2023-6597
- Unknown DEBIAN-CVE-2024-0450
- Unknown DEBIAN-CVE-2023-40217
Exploit Protection
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DEBIAN-CVE-2025-4517 carries CVSS 9.5 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.
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