CVE-2023-45853

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2023-10-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
—
EPSS
86.7%
KEV
Not listed

Published

October 14, 2023

Last Modified

July 14, 2026

Advisory Details (10)

Auto-updated Jul 17, 2026
Patch available. Sources: github_pr.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20231130-0009/
generic

zlib: Buffer Overflow (GLSA 202401-18) — Gentoo security

https://security.gentoo.org/glsa/202401-18
generic

pyminizip · PyPI

https://pypi.org/project/pyminizip/#history
generic Patch Available

[SECURITY] [DLA 3670-1] minizip security update

https://lists.debian.org/debian-lts-announce/2023/11/msg00026.html
github_pr

minizip: Check length of comment, filename, and extra field, in zipOpenNewFileInZip4_64

Upstream fix in progress (PR #843 · madler/zlib, state=closed)

https://github.com/madler/zlib/pull/843
generic

zlib/contrib/README.contrib at ac8f12c97d1afd9bafa9c710f827d40a407d3266 · madler/zlib · GitHub

https://github.com/madler/zlib/blob/ac8f12c97d1afd9bafa9c710f827d40a407d3266/contrib/README.contrib#L1-L4
generic

de29dd6c7151d3cd37cb4cf0036800ddfb1d8b61 - chromium/src - Git at Google

https://chromium.googlesource.com/chromium/src/+/de29dd6c7151d3cd37cb4cf0036800ddfb1d8b61
generic

d709fb23806858847131027da95ef4c548813356 - chromium/src - Git at Google

https://chromium.googlesource.com/chromium/src/+/d709fb23806858847131027da95ef4c548813356
generic

oss-security - Re: CVE-2023-45853: overflows in MiniZip in zlib through 1.3

http://www.openwall.com/lists/oss-security/2024/01/24/10
generic

oss-security - CVE-2023-45853: overflows in MiniZip in zlib through 1.3

http://www.openwall.com/lists/oss-security/2023/10/20/9

Vendor Advisories for CVE-2023-45853(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuzlib1g-dev (1:1.2.8.dfsg-1ubuntu1.1+esm3) @ trusty2026-05-24ubuntu
redhatzlib2023-12-07redhat
pippyminizip—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
pyminizip0.0.1 ... 0.2.6 (11 versions)——

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 106 total refreshes for this CVE.

  1. 2026-07-22 23:14 UTCEG score recompute
  2. 2026-07-22 14:06 UTCEPSS rescore
  3. 2026-07-21 15:23 UTCEPSS rescore
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  14. 2026-07-15 07:19 UTCOSV refresh
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  17. 2026-07-14 13:19 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  18. 2026-07-14 12:40 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-45853?
CVE-2023-45853 is a critical vulnerability published on October 14, 2023. 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…
When was CVE-2023-45853 disclosed?
CVE-2023-45853 was first published in the National Vulnerability Database on October 14, 2023, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-45853 actively exploited?
CVE-2023-45853 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 86.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-45853?
CVE-2023-45853 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-45853?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-45853, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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