# CVE-2023-45853: pyminizip affected by zlib's integer overflow/heap based buffer overflow vulnerability due to vulnerable dependency > An integer overflow in MiniZip allows heap-based buffer overflows via long fields, potentially leading to code execution or denial of service. - **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 14 Oct 2023 - **Updated:** 14 Oct 2026 - **Also known as:** AZL-31294, AZL-31298, AZL-31496, AZL-31497, AZL-31500, AZL-33350, AZL-34597, AZL-35229, AZL-35242, AZL-35295, AZL-35400, AZL-38040, AZL-42720, AZL-42741, AZL-43435, AZL-43522, AZL-43525, AZL-43609, AZL-44043, AZL-44127, AZL-44436, AZL-44985, AZL-61279, AZL-61795, CLSA-2023-1698179235, CLSA-2023-1698179598, CLSA-2023-1698179730, CLSA-2023-1698179874, CLSA-2023-1698180079, CLSA-2023-1698180296, CLSA-2023-1698180806, DEBIAN-CVE-2023-45853, DLA-3670-1, ECHO-8ed3-9419-847f, GHSA-mq29-j5xf-cjwr, JLSEC-2026-479, MGASA-2023-0312, OESA-2023-1751, PYSEC-2026-501, ROOT-OS-DEBIAN-11-CVE-2023-45853, ROOT-OS-DEBIAN-12-CVE-2023-45853, SUSE-SU-2023:4215-1, SUSE-SU-2023:4216-1, SUSE-SU-2023:4217-1, SUSE-SU-2024:2431-1, UBUNTU-CVE-2023-45853, USN-7107-1, openSUSE-SU-2024:13363-1, openSUSE-SU-2025:14857-1 ## What is CVE-2023-45853? CVE-2023-45853 is a high-severity vulnerability in n/a, published on 14 Oct 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### 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. Weakness: CWE-190 (Integer Overflow or Wraparound) ## Which versions are affected by CVE-2023-45853? 3 open source packages ship an affected version, including pyminizip. It affects 2 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `pyminizip` | PyPI | All versions to 0.2.6 | None | | `pyminizip` | PyPI | All versions to 0.2.6 | None | | `pyminizip` | PyPI | All versions to 0.2.6 | None | | `zlib` | SUSE:Linux Enterprise Micro 5.1 | All versions | 1.2.11-150000.3.48.1 | | `zlib` | SUSE:Linux Enterprise Micro 5.2 | All versions | 1.2.11-150000.3.48.1 | | `zlib` | SUSE:Linux Enterprise Micro 5.3 | All versions | 1.2.11-150000.3.48.1 | | `zlib` | SUSE:Linux Enterprise Micro 5.4 | All versions | 1.2.11-150000.3.48.1 | | `zlib` | SUSE:Linux Enterprise Micro 5.5 | All versions | 1.2.13-150500.4.3.1 | | `zlib` | SUSE:Linux Enterprise Micro 5.5 | All versions | 1.2.13-150500.4.3.1 | | `zlib` | SUSE:Linux Enterprise Module for Basesystem 15 SP4 | All versions | 1.2.11-150000.3.48.1 | | `zlib` | SUSE:Linux Enterprise Module for Basesystem 15 SP5 | All versions | 1.2.13-150500.4.3.1 | | `zlib` | SUSE:Linux Enterprise Module for Development Tools 15 SP4 | All versions | 1.2.11-150000.3.48.1 | | `zlib` | SUSE:Linux Enterprise Module for Development Tools 15 SP5 | All versions | 1.2.13-150500.4.3.1 | | `zlib` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 1.2.11-11.37.1 | | `zlib` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 1.2.11-11.37.1 | | `zlib` | SUSE:Linux Enterprise Software Development Kit 12 SP5 | All versions | 1.2.11-11.37.1 | | `zlib` | SUSE:Manager Proxy 4.2 | All versions | 1.2.11-150000.3.48.1 | | `zlib` | SUSE:Manager Server 4.2 | All versions | 1.2.11-150000.3.48.1 | | `zlib` | openSUSE:Leap 15.4 | All versions | 1.2.11-150000.3.48.1 | | `zlib` | openSUSE:Leap 15.5 | All versions | 1.2.13-150500.4.3.1 | | `zlib` | openSUSE:Leap Micro 5.3 | All versions | 1.2.11-150000.3.48.1 | | `zlib` | openSUSE:Leap Micro 5.4 | All versions | 1.2.11-150000.3.48.1 | | `grype` | openSUSE:Tumbleweed | All versions | 0.88.0-1.1 | Products: Smihica Pyminizip, Zlib Zlib. ## How do I fix CVE-2023-45853? Apply the vendor's patch. ## Is CVE-2023-45853 being exploited? There is no known exploitation of CVE-2023-45853 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2023-45853 and fix it if it is affected. What it is: CVE-2023-45853 is a high-severity vulnerability in n/a, published on 14 Oct 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: There is no known exploitation of CVE-2023-45853 in the wild and no public exploit code. Affected packages and fixed versions: - pyminizip (PyPI): affected all versions up to 0.2.6; no fix listed - pyminizip (PyPI): affected all versions up to 0.2.6; no fix listed - pyminizip (PyPI): affected all versions up to 0.2.6; no fix listed Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2023-45853/ (Markdown: https://insights.sbomify.com/CVE-2023-45853/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2023-45853 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-45853 - OSV: https://osv.dev/vulnerability/CVE-2023-45853 --- From sbomify Insights: https://insights.sbomify.com/CVE-2023-45853/ Summaries are generated and may contain mistakes; the official description above is the record.