CVE-2022-44900 — A directory traversal vulnerability in the SevenZipFile

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.

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-12-06T00:00:00.000Z
• Last modified: 2025-04-23T14:32:21.734Z

09References

• github.com — https://github.com/miurahr/py7zr/commit/1bb43f17515c7f69673a1c88ab9cc72a7bbef406
• packetstormsecurity.com — http://packetstormsecurity.com/files/170127/py7zr-0.20.0-Directory-Traversal.htm…
• lessonsec.com — https://lessonsec.com/cve/cve-2022-44900/