CVE-2022-44900: A directory traversal vulnerability in the SevenZipFile.extractall() function of the python library py7zr v0.2

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CRITICAL 9.1REMOTEUPGRADE

CVE-2022-44900 is a critical-severity flaw (CVSS 9.1) affecting py7zr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A directory traversal vulnerability in the SevenZipFile.extractall() function of the python library py7zr v0.20.0 and earlier allows attackers to write arbitrary files via extracting a crafted 7z file.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.5% (top 16%)
CISA exploited list	No
Weakness	CWE-22
Published	2022-12-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: py7zr project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-12-06 20:15 UTCPublished CVE record published
2026-06-17 05:09 UTCUpdated Record last modified

py7zr project py7zr UPGRADE

Affected: < 0.20.1

Fixed in: 0.20.1

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show py7zr

2. UPGRADE to 0.20.1

pip install --upgrade "py7zr>=0.20.1"

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-2022-44900?

py7zr: upgrade to 0.20.1. Exact commands for each OS are on this page.

Is CVE-2022-44900 being exploited?

CVE-2022-44900 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-2022-44900 affect?

CVE-2022-44900 affects py7zr. Severity is critical (CVSS 9.1). A directory traversal vulnerability in the SevenZipFile.extractall() function of the python library py7zr v0.20.0 and earlier allows attackers to write arbitrary files via extracting a crafted 7z file.

How urgent is CVE-2022-44900?

Priority 63/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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