CVE-2025-8194

CVE-2025-8194 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-835.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• EPSS exploit prediction: 1% (45th percentile)
• Actively exploited: Not listed in CISA KEV
• EU (EUVD) id: EUVD-2025-22999
• Weakness: CWE-835
• Published: 2025-07-28
• Last modified: 2026-06-17

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

Frequently asked questions

What is CVE-2025-8194?

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

How severe is CVE-2025-8194?

CVE-2025-8194 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-8194 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-8194?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-8194 have an EU (EUVD) identifier?

Yes. CVE-2025-8194 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-22999.

When was CVE-2025-8194 published?

CVE-2025-8194 was published on 2025-07-28 and last updated on 2026-06-17.

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/[email protected]/thread/ZULLF3IZ726XP5EY7XJ7YIN3K5MDYR2D/
• http://www.openwall.com/lists/oss-security/2025/07/28/1
• http://www.openwall.com/lists/oss-security/2025/07/28/2

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