CVE-2023-45853
CWE-190Published: October 14, 2023· Updated: Jul 14, 2026
Official Description
MiniZip in zlib through 1.3 has an integer overflow and resultant heap-based buffer overflow in zipOpenNewFileInZip4_64 via a long filename, comment, or extra field. NOTE: MiniZip is not a supported part of the zlib product. NOTE: pyminizip through 0.2.6 is also vulnerable because it bundles an affected zlib version, and exposes the applicable MiniZip code through its compress API.
Risk Analysis
A heap-based buffer overflow exists in the MiniZip component of zlib and pyminizip due to an integer overflow when processing long filenames. This critical vulnerability allows for potential remote code execution, reflected in its 9.8 CVSS score.
No public exploit is known, and it is not in the KEV catalog. The vulnerability is remotely exploitable with low complexity.
Update zlib and pyminizip to versions that include the fix for the MiniZip buffer overflow.
Technical Analysis
CVE-2023-45853 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (25)
Quick Facts
Related CVEs (CWE-190)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-45853 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts