---
id: CVE-2023-53159
title: >-
  The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an
  empty string to X509VerifyParamRef::set_host.
summary: >-
  The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an
  empty string to X509VerifyParamRef::set_host.
severity: medium
cvss: 4.5
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L'
cwe:
  - CWE-126
vendor: sfackler
product: openssl
affected:
  - openssl < 0.10.55
patched:
  - openssl 0.10.55
published: '2025-07-28'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T16:42:20.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-53159'
references:
  - url: 'https://crates.io/crates/openssl'
    label: cve@mitre.org
  - url: 'https://github.com/sfackler/rust-openssl/issues/1965'
    label: cve@mitre.org
  - url: 'https://rustsec.org/advisories/RUSTSEC-2023-0044.html'
    label: cve@mitre.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53159.json
  - url: 'https://access.redhat.com/security/cve/CVE-2023-53159'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2383808'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2023-53159'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-53159'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
epss: 0.00192
epssPercentile: 0.09123
ingestedAt: '2026-09-17T17:23:30.591Z'
scores:
  nvd: 4.5
  vendor: 5.7
---

## Overview

The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an empty string to X509VerifyParamRef::set_host.

## Affected

- `openssl < 0.10.55`

## Remediation

Upgrade past the affected range:

- `openssl 0.10.55`

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Logging Subsystem for Red Hat OpenShift, OpenShift Service Mesh 3, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · no fix planned: Logging Subsystem for Red Hat OpenShift, OpenShift Service Mesh 3, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, … · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53159.json)