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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: None knownExposed: 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
45(Track)
EG Risk 45/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation3% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
87%
KEV
Not listed

Published

October 14, 2023

Last Modified

July 14, 2026

Advisory Details (10)

Auto-updated Sep 5, 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

Client Challenge

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

(8 across 6 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
minizip1.1-81.1-8+deb11u1—
zlib1:1.2.11.dfsg-2 ... 1:1.3.dfsg-3.1~exp1 (20 versions)——
Debian:12(2)
PackageVulnerable rangeFixed inDependents
minizip1.1-81.1-8+deb12u1—
zlib1:1.2.13.dfsg-1 ... 1:1.3.dfsg-3.1~exp1 (14 versions)——
Debian:10(1)
PackageVulnerable rangeFixed inDependents
minizip1.1-81.1-8+deb10u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
zlib—1:1.3.dfsg-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
zlib—1:1.3.dfsg-2—
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 10× in last 7d / 35× 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 165 total refreshes for this CVE.

  1. 2026-09-07 15:59 UTCEPSS rescore
  2. 2026-09-06 13:46 UTCEPSS rescore
  3. 2026-09-06 13:45 UTCEPSS rescore
  4. 2026-09-05 15:26 UTCEPSS rescore
  5. 2026-09-04 13:58 UTCEPSS rescore
  6. 2026-09-04 05:04 UTCEPSS rescore
  7. 2026-09-03 15:59 UTCOSV refresh
  8. 2026-09-02 14:10 UTCEPSS rescore
  9. 2026-09-02 14:09 UTCEPSS rescore
  10. 2026-09-01 13:51 UTCEPSS rescore
  11. 2026-09-01 04:35 UTCEPSS rescore
  12. 2026-08-30 19:15 UTCEPSS rescore
  13. 2026-08-30 01:20 UTCEPSS rescore
  14. 2026-08-28 21:39 UTCEPSS rescore
  15. 2026-08-27 14:23 UTCEPSS rescore
  16. 2026-08-26 14:44 UTCEPSS rescore
  17. 2026-08-25 13:46 UTCEPSS rescore
  18. 2026-08-24 14:14 UTCEPSS rescore
  19. 2026-08-23 00:17 UTCEPSS rescore
  20. 2026-08-21 23:47 UTCEPSS rescore
  21. 2026-08-20 22:53 UTCEPSS rescore
  22. 2026-08-19 17:02 UTCEPSS rescore
  23. 2026-08-19 17:02 UTCEPSS rescore
  24. 2026-08-18 13:46 UTCEPSS rescore
  25. 2026-08-17 13:45 UTCEPSS rescore
Show 75 more
  1. 2026-08-17 05:20 UTCOSV refresh
  2. 2026-08-16 14:54 UTCEPSS rescore
  3. 2026-08-16 02:12 UTCEPSS rescore
  4. 2026-08-15 01:28 UTCEPSS rescore
  5. 2026-08-13 21:58 UTCEPSS rescore
  6. 2026-08-12 13:49 UTCEPSS rescore
  7. 2026-08-11 13:40 UTCEPSS rescore
  8. 2026-08-10 23:57 UTCEPSS rescore
  9. 2026-08-09 13:44 UTCEPSS rescore
  10. 2026-08-09 13:44 UTCEPSS rescore
  11. 2026-08-08 16:35 UTCEPSS rescore
  12. 2026-08-07 16:25 UTCEPSS rescore
  13. 2026-08-06 13:45 UTCEPSS rescore
  14. 2026-08-05 19:15 UTCEPSS rescore
  15. 2026-08-04 15:07 UTCEPSS rescore
  16. 2026-08-04 10:35 UTCEPSS rescore
  17. 2026-08-03 10:34 UTCEPSS rescore
  18. 2026-08-03 10:34 UTCEPSS rescore
  19. 2026-08-02 02:25 UTCEPSS rescore
  20. 2026-08-02 02:25 UTCEPSS rescore
  21. 2026-08-02 00:06 UTCOSV refresh
  22. 2026-08-01 04:14 UTCEPSS rescore
  23. 2026-07-30 16:26 UTCEPSS rescore
  24. 2026-07-30 16:26 UTCEPSS rescore
  25. 2026-07-30 01:28 UTCEPSS rescore
  26. 2026-07-28 15:34 UTCEPSS rescore
  27. 2026-07-28 15:34 UTCEPSS rescore
  28. 2026-07-27 14:10 UTCEPSS rescore
  29. 2026-07-26 14:52 UTCEPSS rescore
  30. 2026-07-25 14:16 UTCEPSS rescore
  31. 2026-07-24 14:16 UTCEPSS rescore
  32. 2026-07-24 14:16 UTCEPSS rescore
  33. 2026-07-23 14:16 UTCEPSS rescore
  34. 2026-07-23 02:27 UTCEG score recompute
  35. 2026-07-22 23:14 UTCEG score recompute
  36. 2026-07-22 14:06 UTCEPSS rescore
  37. 2026-07-21 15:23 UTCEPSS rescore
  38. 2026-07-21 15:23 UTCEPSS rescore
  39. 2026-07-20 17:06 UTCEPSS rescore
  40. 2026-07-19 14:29 UTCEPSS rescore
  41. 2026-07-19 14:29 UTCEPSS rescore
  42. 2026-07-19 02:27 UTCEPSS rescore
  43. 2026-07-18 10:03 UTCEPSS rescore
  44. 2026-07-18 10:03 UTCEPSS rescore
  45. 2026-07-16 17:01 UTCEPSS rescore
  46. 2026-07-15 16:56 UTCEPSS rescore
  47. 2026-07-15 16:56 UTCEPSS rescore
  48. 2026-07-15 07:19 UTCOSV refresh
  49. 2026-07-15 01:59 UTCEPSS rescore
  50. 2026-07-15 01:59 UTCEPSS rescore
  51. 2026-07-14 13:19 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  52. 2026-07-14 12:40 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  53. 2026-07-13 22:28 UTCEPSS rescore
  54. 2026-07-13 22:28 UTCEPSS rescore
  55. 2026-07-13 06:11 UTCEPSS rescore
  56. 2026-07-13 06:11 UTCEPSS rescore
  57. 2026-07-12 05:45 UTCEPSS rescore
  58. 2026-07-11 08:26 UTCEPSS rescore
  59. 2026-07-09 19:08 UTCEPSS rescore
  60. 2026-07-08 15:13 UTCEPSS rescore
  61. 2026-07-07 13:44 UTCEPSS rescore
  62. 2026-07-07 13:44 UTCEPSS rescore
  63. 2026-07-06 16:26 UTCEPSS rescore
  64. 2026-07-06 16:26 UTCEPSS rescore
  65. 2026-07-06 02:22 UTCEPSS rescore
  66. 2026-07-05 02:29 UTCEPSS rescore
  67. 2026-07-04 06:29 UTCEPSS rescore
  68. 2026-07-04 06:29 UTCEPSS rescore
  69. 2026-07-02 16:59 UTCEPSS rescore
  70. 2026-07-01 15:05 UTCEPSS rescore
  71. 2026-06-30 23:21 UTCEPSS rescore
  72. 2026-06-30 23:21 UTCEPSS rescore
  73. 2026-06-28 14:06 UTCEPSS rescore
  74. 2026-06-28 14:06 UTCEPSS rescore
  75. 2026-06-28 04:55 UTCEPSS rescore

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 3% probability of exploitation in the next 30 days, which ranks it in the top 12.8% of all scored CVEs.
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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-45853

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