CVE-2026-44722
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 2% of all known CVEs.
References
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?
No published fix for CVE-2026-44722 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
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.
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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.