CVE-2025-8194

EUVD-2025-22999

28.07.2025, 19:15

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:  https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1

Infinite Loop

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
PSF	CNA	7.5 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
python	cpython	𝑥 < 3.9.24	CNA
python	cpython	3.10.0 ≤ 𝑥 < 3.10.19	CNA
python	cpython	3.11.0 ≤ 𝑥 < 3.11.14	CNA
python	cpython	3.12.0 ≤ 𝑥 < 3.12.12	CNA
python	cpython	3.13.0 ≤ 𝑥 < 3.13.6	CNA

Ubuntu Releases

Ubuntu Product

Codename

python2.7

bionic	Fixed 2.7.17-1~18.04ubuntu1.13+esm12 released
focal	Fixed 2.7.18-1~20.04.7+esm8 released
jammy	Fixed 2.7.18-13ubuntu1.5+esm7 released
noble	dne
plucky	dne
questing	dne
trusty	Fixed 2.7.6-8ubuntu0.6+esm26 released
xenial	Fixed 2.7.12-1ubuntu0~16.04.18+esm17 released

python3.4

jammy	dne
noble	dne
plucky	dne
questing	dne
trusty	Fixed 3.4.3-1ubuntu1~14.04.7+esm16 released

python3.5

jammy	dne
noble	dne
plucky	dne
questing	dne
trusty	Fixed 3.5.2-2ubuntu0~16.04.4~14.04.1+esm7 released
xenial	Fixed 3.5.2-2ubuntu0~16.04.13+esm19 released

python3.6

bionic	Fixed 3.6.9-1~18.04ubuntu1.13+esm6 released
jammy	dne
noble	dne
plucky	dne
questing	dne

python3.7

bionic	Fixed 3.7.5-2ubuntu1~18.04.2+esm7 released
jammy	dne
noble	dne
plucky	dne
questing	dne

python3.8

bionic	Fixed 3.8.0-3ubuntu1~18.04.2+esm6 released
focal	Fixed 3.8.10-0ubuntu1~20.04.18+esm2 released
jammy	dne
noble	dne
plucky	dne
questing	dne

python3.9

focal	Fixed 3.9.5-3ubuntu0~20.04.1+esm6 released
jammy	dne
noble	dne
plucky	dne
questing	dne

python3.10

jammy	Fixed 3.10.12-1~22.04.11 released
noble	dne
plucky	dne
questing	dne

python3.11

jammy	Fixed 3.11.0~rc1-1~22.04.1~esm5 released
noble	dne
plucky	dne
questing	dne

python3.12

jammy	dne
noble	Fixed 3.12.3-1ubuntu0.8 released
plucky	dne
questing	dne

python3.13

jammy	dne
noble	dne
plucky	Fixed 3.13.3-1ubuntu0.3 released
questing	Fixed 3.13.6-1 released

python3.14

jammy	dne
noble	dne
plucky	dne
questing	not-affected

Common Weakness Enumeration

CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
The program contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.

References

https://gist.github.com/sethmlarson/1716ac5b82b73dbcbf23ad2eff8b33e1

https://github.com/python/cpython/commit/57f5981d6260ed21266e0c26951b8564cc252bc2

https://github.com/python/cpython/commit/7040aa54f14676938970e10c5f74ea93cd56aa38

https://github.com/python/cpython/commit/73f03e4808206f71eb6b92c579505a220942ef19

https://github.com/python/cpython/commit/b4ec17488eedec36d3c05fec127df71c0071f6cb

https://github.com/python/cpython/commit/c9d9f78feb1467e73fd29356c040bde1c104f29f

https://github.com/python/cpython/commit/cdae923ffe187d6ef916c0f665a31249619193fe

https://github.com/python/cpython/commit/fbc2a0ca9ac8aff6887f8ddf79b87b4510277227

https://github.com/python/cpython/issues/130577

https://github.com/python/cpython/pull/137027

https://mail.python.org/archives/list/security-announce@python.org/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/

http://www.openwall.com/lists/oss-security/2025/07/28/1

http://www.openwall.com/lists/oss-security/2025/07/28/2