## russh: Unbounded memory allocation in agent protocol server via crafted constraint records

- 種別: advisory
- 重大度: medium
- 関連技術: rust
- CVE: CVE-2026-111061
- 公開日時: 2026-10-19T17:06:46.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-4wc5-f2rc-q74m)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-4wc5-f2rc-q74m

影響: rust:russh <= 0.64.0 → 0.64.1
Summary russh_keys::agent::server::add_key (russh/src/keys/agent/server.rs:271-319) spawns a dedicated tokio task for every 5-byte SSH_AGENT_CONSTRAIN_LIFETIME record attached to an added key, each cloning the key blob and sleeping for the declared lifetime (up to ~136 years). The loop has no per-request task budget, and spawned tasks are not rolled back when the overall request fails. Repeating one constrained add-key message over an agent connection converts wire bytes into resident tasks and…