# CVE-2023-4535: Opensc: out-of-bounds read in myeid driver handling encryption using symmetric keys

> An attacker with physical access can exploit an out-of-bounds read in the OpenSC MyEID driver to access sensitive data via a crafted smart card.

- **Severity:** Medium 4.5 (`CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 6 Nov 2023
- **Updated:** 21 Nov 2025
- **Also known as:** AZL-31945, AZL-35076, DEBIAN-CVE-2023-4535, GHSA-phh2-j3h6-vqr9

## What is CVE-2023-4535?

CVE-2023-4535 is a medium-severity vulnerability in Fedoraproject Fedora, published on 6 Nov 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

An out-of-bounds read vulnerability was found in OpenSC packages within the MyEID driver when handling symmetric key encryption. Exploiting this flaw requires an attacker to have physical access to the computer and a specially crafted USB device or smart card. This flaw allows the attacker to manipulate APDU responses and potentially gain unauthorized access to sensitive data, compromising the system's security.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2023-4535?

It affects 3 products.


Products: Fedoraproject Fedora, Opensc Project Opensc, Redhat Enterprise Linux.

## How do I fix CVE-2023-4535?

Apply the vendor's patch.

## Is CVE-2023-4535 being exploited?

There is no known exploitation of CVE-2023-4535 in the wild and no public exploit code.

## Other vulnerabilities in Fedoraproject Fedora

- [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild)
- [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild)
- [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-4535 and fix it if it is affected.

What it is: CVE-2023-4535 is a medium-severity vulnerability in Fedoraproject Fedora, published on 6 Nov 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-4535 in the wild and no public exploit code.

Affected product: Fedoraproject Fedora. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2023-4535/ (Markdown: https://insights.sbomify.com/CVE-2023-4535/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-4535
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-4535
- OSV: https://osv.dev/vulnerability/CVE-2023-4535

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-4535/
Summaries are generated and may contain mistakes; the official description above is the record.