CVE-2025-8194
Published: July 29, 2025Last modified: August 7, 2025
Description
There is a defect in the CPython “tarfile” module affecting the “TarFile” extraction and entry enumeration APIs. The tar implementation would process tar archives with negative offsets without error, resulting in an infinite loop and deadlock during the parsing of maliciously crafted tar archives. This vulnerability can be mitigated by including the following patch after importing the “tarfile” module: import tarfile def _block_patched(self, count): if count < 0: # pragma: no cover raise tarfile.InvalidHeaderError("invalid offset") return _block_patched._orig_block(self, count) _block_patched._orig_block = tarfile.TarInfo._block tarfile.TarInfo._block = _block_patched
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | NONE |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | python3 | Vulnerable (3.11.3-r0) |
| 25 LTS | python3 | Vulnerable (3.12.10-r1) | |
| Stream | python3 | Vulnerable (3.11.4-r0) | |
| Hardened Containers | 23 LTS | python3 | Vulnerable (3.11.3-r0) |
| Stream | python3 | Vulnerable (3.11.4-r0) |
References
- https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1
- https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38
- https://github.com/python/cpython/commit/cdae923ffe187d6ef916c0f665a31249619193fe
- https://github.com/python/cpython/issues/130577
- https://github.com/python/cpython/pull/137027
- https://mail.python.org/archives/list/[email protected]/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/