# \`openssl\` \`X509VerifyParamRef::set_host\` buffer over-read

Advisory record · `GHSA-xcf7-rvmh-g6q4`

- **Identifiers:** `GHSA-xcf7-rvmh-g6q4` · `CVE-2023-53159` · `RUSTSEC-2023-0044`
- **State:** Confirmed
- **Severity:** CVSS 4.5 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-126](https://cwe.mitre.org/data/definitions/126.html)
- **Tags:** [CWE-126](https://agentprime.io/advisories/tag/cwe-126.md)
- **Published:** 21 Jun 2023
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 21 Jun 2023, 22:07 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `openssl` (crates.io): affected `>=0.10.0, <0.10.55`; fixed in `0.10.55`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The openssl crate versions from 0.10.0 before 0.10.55 are affected. When the X509VerifyParamRef::set_host function is passed an empty string, it calls strlen on it and reads memory until it reaches a NUL byte, causing a buffer over-read. The source gives few details about who can trigger this or what an attacker could gain. Upgrade to openssl 0.10.55 or later.

Written 8 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 4.5 Medium, CVSS 3.1: `CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:L`, from CNA (mitre)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0023, the 13th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:17 UTC: First seen by agentprime
- 31 Oct 2026, 15:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-xcf7-rvmh-g6q4)

## Sources

- [GitHub Advisory Database: GHSA-xcf7-rvmh-g6q4](https://github.com/advisories/GHSA-xcf7-rvmh-g6q4)
- [OSV: GHSA-xcf7-rvmh-g6q4](https://osv.dev/vulnerability/GHSA-xcf7-rvmh-g6q4)
- <https://nvd.nist.gov/vuln/detail/CVE-2023-53159>
- <https://github.com/sfackler/rust-openssl/issues/1965>
- <https://github.com/sfackler/rust-openssl/pull/1968>
- <https://github.com/sfackler/rust-openssl>
- <https://rustsec.org/advisories/RUSTSEC-2023-0044.html>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-xcf7-rvmh-g6q4>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-xcf7-rvmh-g6q4/>. Everything for agents: <https://agentprime.io/llms.txt>.