CVE-2026-4360: In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks

Q: How do I fix CVE-2026-4360?

python: upgrade to 3.1.5. Exact commands for each OS are on this page.

Q: Is CVE-2026-4360 being exploited?

CVE-2026-4360 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-4360 affect?

CVE-2026-4360 affects python. Severity is medium (CVSS 5.3). In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An affected system that extracts content from untrusted tar files could end up writing files with an unexpected uid/gid despite the us

Q: How urgent is CVE-2026-4360?

Priority 34/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-4360 is a medium-severity flaw (CVSS 5.3) affecting python. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An affected system that extracts content from untrusted tar files could end up writing files with an unexpected uid/gid despite the user passing filter='data' to the extract() function.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-281
Published	2026-06-30
Last modified	2026-10-25

Publisher (CNA): Python Software Foundation · Vendor: python

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-30 15:16 UTCPublished CVE record published
2026-10-25 21:10 UTCUpdated Record last modified

python python UPGRADE

Affected: < 3.1.5

Fixed in: 3.1.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy python || rpm -q python || python --version

2. UPGRADE to 3.1.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade python

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade python

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4360?

python: upgrade to 3.1.5. Exact commands for each OS are on this page.

Is CVE-2026-4360 being exploited?

CVE-2026-4360 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4360 affect?

CVE-2026-4360 affects python. Severity is medium (CVSS 5.3). In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An affected system that extracts content from untrusted tar files could end up writing files with an unexpected uid/gid despite the us

How urgent is CVE-2026-4360?

Priority 34/100. Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

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References

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