# Marvin Attack: potential key recovery through timing sidechannels

Advisory record · `GHSA-4grx-2x9w-596c`

- **Identifiers:** `GHSA-4grx-2x9w-596c` · `CVE-2023-49092` · `GHSA-c38w-74pg-36hr` · `RUSTSEC-2023-0071`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-385](https://cwe.mitre.org/data/definitions/385.html)
- **Tags:** [CWE-385](https://agentprime.io/advisories/tag/cwe-385.md)
- **Published:** 22 Nov 2023
- **Updated:** 14 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 22 Nov 2023, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `rsa` (crates.io): affected `>=0.0.0-0`; no fixed version yet

## 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

- 5.9 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0061, the 49th percentile, on 5 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/RUSTSEC-2023-0071)

## Sources

- [GitHub Advisory Database: GHSA-4grx-2x9w-596c](https://github.com/advisories/GHSA-4grx-2x9w-596c)
- [OSV: GHSA-4grx-2x9w-596c](https://osv.dev/vulnerability/GHSA-4grx-2x9w-596c)
- <https://crates.io/crates/rsa>
- <https://rustsec.org/advisories/RUSTSEC-2023-0071.html>
- <https://people.redhat.com/~hkario/marvin/>
- <https://github.com/RustCrypto/RSA/pull/394>
- <https://github.com/RustCrypto/RSA/pull/680>
- <https://github.com/RustCrypto/RSA/pull/702>

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-4grx-2x9w-596c>, 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-4grx-2x9w-596c/>. Everything for agents: <https://agentprime.io/llms.txt>.