CVE-2023-45853

Name: CVE-2023-45853
Creator: NVD / NIST
Published: 2023-10-14T02:15:09.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.92%

Last modified Jun 17, 2026

CVE-2023-45853 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 2.92% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.92%

85.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Zlib	Zlib	< 1.3.1
Smihica	Pyminizip	<= 0.2.6

References

http://www.openwall.com/lists/oss-security/2023/10/20/9Mailing List
http://www.openwall.com/lists/oss-security/2024/01/24/10Mailing List
https://chromium.googlesource.com/chromium/src/+/d709fb23806858847131027da95ef4c548813356Mailing List, Patch
https://chromium.googlesource.com/chromium/src/+/de29dd6c7151d3cd37cb4cf0036800ddfb1d8b61Mailing List, Patch
https://github.com/madler/zlib/blob/ac8f12c97d1afd9bafa9c710f827d40a407d3266/contrib/README.contrib#L1-L4Product
https://github.com/madler/zlib/pull/843Issue Tracking, Patch
https://lists.debian.org/debian-lts-announce/2023/11/msg00026.htmlMailing List, Third Party Advisory
https://pypi.org/project/pyminizip/#historyRelease Notes
https://security.gentoo.org/glsa/202401-18Third Party Advisory
https://security.netapp.com/advisory/ntap-20231130-0009/Third Party Advisory
https://www.winimage.com/zLibDll/minizip.htmlProduct
http://www.openwall.com/lists/oss-security/2023/10/20/9Mailing List
http://www.openwall.com/lists/oss-security/2024/01/24/10Mailing List
https://chromium.googlesource.com/chromium/src/+/d709fb23806858847131027da95ef4c548813356Mailing List, Patch
https://chromium.googlesource.com/chromium/src/+/de29dd6c7151d3cd37cb4cf0036800ddfb1d8b61Mailing List, Patch
https://github.com/madler/zlib/blob/ac8f12c97d1afd9bafa9c710f827d40a407d3266/contrib/README.contrib#L1-L4Product
https://github.com/madler/zlib/pull/843Issue Tracking, Patch
https://lists.debian.org/debian-lts-announce/2023/11/msg00026.htmlMailing List, Third Party Advisory
https://pypi.org/project/pyminizip/#historyRelease Notes
https://security.gentoo.org/glsa/202401-18Third Party Advisory
https://security.netapp.com/advisory/ntap-20231130-0009/Third Party Advisory
https://www.winimage.com/zLibDll/minizip.htmlProduct

Timeline

Published: Oct 14, 2023
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-45853?

How severe is CVE-2023-45853?

CVE-2023-45853 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.92% probability of exploitation in the next 30 days.

How do I fix CVE-2023-45853?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-45853?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST