# CVE-2023-53159: The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an empty string to X509VerifyParamRef::set_host.

CVE-2023-53159 is fixed in 2 products on 1 platform, first by librust-openssl-dev 0.10.23-1ubuntu0.1~esm1, released July 27, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-53159
- Priority: Routine
- CVSS: 4.5 (Medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 27, 2025
- Weakness: Buffer Over-read
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-53159

## Description

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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | librust-openssl-dev Ubuntu 20.04 LTS (focal) | 0.10.23-1ubuntu0.1~esm1 | [librust-openssl-dev 0.10.23-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-librust-openssl-dev-0.10.23-1ubuntu0.1-esm1.md) | Jul 27, 2025 |
| Linux | librust-openssl-dev Ubuntu 22.04.1 LTS (jammy) | 0.10.36-1ubuntu0.1~esm1 | [librust-openssl-dev 0.10.36-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-librust-openssl-dev-0.10.36-1ubuntu0.1-esm1.md) | Jul 27, 2025 |
| Linux | rust-openssl Debian 13.5 (trixie) | 0.10.57-1 | [DEBIAN-CVE-2023-53159](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53159.md) | Jul 28, 2025 |
| Linux | rust-openssl Debian 14 | 0.10.57-1 | [DEBIAN-CVE-2023-53159](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53159.md) | Jul 28, 2025 |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.