CVE-2023-45853

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.

Published: 2023-10-14 Last update: 2024-12-20 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-45853 is rated High Risk (70.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.92%). EPSS rose +1.52% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-45853

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.40% 2.92% +1.52%
2 2026-05-05 1.32% 1.40% +0.07%
3 2026-03-21 — 1.32% —

Full EPSS history (31 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-45853

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2023-45853

GitHub Security Advisory for CVE-2023-45853

GHSA-mq29-j5xf-cjwr · Severity: critical · Ecosystem: pip — pyminizip affected by zlib's integer overflow/heap based buffer overflow vulnerability due to vulnerable dependency

OS Trackers for CVE-2023-45853

vendor priority summary link
alpine — CVE-2023-45853: 4 source package rows (minizip, qt5-qtwebengine, qt6-qtwebengine, zlib); 34 state rows across 13 repos (3.17-main, 3.18-community, 3.18-main, 3.19-community, 3.19-main, 3.20-community, 3.20-main, 3.21-community, 3.21-main, 3.22-community, 3.22-main, edge-community, edge-main); fixed 34, open 0. https://security.alpinelinux.org/vuln/CVE-2023-45853
debian not yet assigned CVE-2023-45853 not yet assigned priority: Debian including 2 source packages (minizip, zlib), 7 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5, open 2. https://security-tracker.debian.org/tracker/CVE-2023-45853
gentoo high CVE-2023-45853: 1 GLSA(s) (202401-18), 1 atom(s) (sys-libs/zlib); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2023-45853
redhat medium — https://access.redhat.com/security/cve/CVE-2023-45853
suse medium CVE-2023-45853 severity moderate: SUSE including 452 source package names (0.0.17-1.1:libz1-1.2.13-150500.4.3.1, 0.1.6-1.2:libz1-1.2.13-150500.4.3.1, …), 978 product×package rows across 501 product lines (Container bci/bci-base-fips, Container bci/bci-init, … (501 product lines)): Fixed 790, Known Affected 180, First Fixed 7, Will Not Fix 1. https://www.suse.com/security/cve/CVE-2023-45853/
ubuntu medium CVE-2023-45853 medium priority: Ubuntu including 3 source packages (klibc, rsync, zlib), 29 status rows across 10 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, trusty, upstream, xenial): not-affected 26, needs-triage 2, released 1. https://ubuntu.com/security/CVE-2023-45853

Affected software / configurations for CVE-2023-45853

Vendor Product Version Raw CPE
zlib zlib < 1.3.1 cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:*
smihica pyminizip <= 0.2.6 cpe:2.3:a:smihica:pyminizip:*:*:*:*:*:python:*:*

References for CVE-2023-45853

URL Tags
http://www.openwall.com/lists/oss-security/2023/10/20/9 Mailing List
http://www.openwall.com/lists/oss-security/2024/01/24/10 Mailing List
https://chromium.googlesource.com/chromium/src/+/d709fb23806858847131027da95ef4c548813356 Mailing List Patch
https://chromium.googlesource.com/chromium/src/+/de29dd6c7151d3cd37cb4cf0036800ddfb1d8b61 Mailing List Patch
https://github.com/madler/zlib/blob/ac8f12c97d1afd9bafa9c710f827d40a407d3266/contrib/README.contrib#L1-L4 Product
https://github.com/madler/zlib/pull/843 Issue Tracking Patch
https://lists.debian.org/debian-lts-announce/2023/11/msg00026.html Mailing List Third Party Advisory
https://pypi.org/project/pyminizip/#history Release Notes
https://security.gentoo.org/glsa/202401-18 Third Party Advisory
https://security.netapp.com/advisory/ntap-20231130-0009/ Third Party Advisory
https://www.winimage.com/zLibDll/minizip.html Product
cvelogic Threat Intelligence