CVE-2026-44722

MEDIUM

6.2

CVSS v3

Description

pyzipper is a replacement for Python's zipfile that can read and write AES encrypted zip files. Prior to 0.4.0, a Python operator precedence bug in pyzipper/zipfile_aes.py caused the AE-2 format to never be automatically selected during encryption, causing encrypted entries to be written in AE-1 format and exposing the plaintext CRC32 checksum in the ZIP header and, for unseekable zip archives, in the datadescripter section, allowing an attacker who possesses the archive to brute-force candidate plaintexts for small or low-entropy files by comparing CRC32 values. This issue is fixed in version 0.4.0.

CWE-480

How to fix

Remediation Available

python-pyzipperDebian

Fixed in:0.4.0-1CVE-2026-44722

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploit Intelligence

0.12%probability of exploitation in 30 days

2ndpercentile

Low risk: more likely to be exploited than 2% of all known CVEs.

References

Other references3

Related Vulnerabilities

Other CWE-480 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-1947	Medium	6.5	1.2%	-	Fix
CVE-2024-35190	Medium	5.8	0.6%	-	-
CVE-2026-63421	High	7.5	0.5%	-	-
CVE-2026-48497	Medium	5.9	0.4%	-	Fix
CVE-2026-15043	Critical	9.8	0.4%	-	Fix
CVE-2026-43114	Critical	9.4	0.4%	-	Fix

Common questions

How do I fix CVE-2026-44722?

Upgrade python-pyzipper on debian unstable to 0.4.0-1 or later.

Is CVE-2026-44722 being actively exploited?

Not that we know of. CVE-2026-44722 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.12% is the estimated probability that it will be exploited in the next 30 days. That is higher than 2% of all scored CVEs.

How severe is CVE-2026-44722?

CVE-2026-44722 has a CVSS v3 base score of 6.2, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-44722 affect?

Published advisories record a fix for python-pyzipper (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-17.