Vulnerability · Published Aug 3, 2026 · Assigned by GitHub_M
CVE-2026-68930Russh: Channel-scoped server callbacks can be reached without an open channel
Medium 6.5
In plain English
A medium-severity incorrect authorization in russh from Eugeny. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 68.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Russh is a Rust SSH client & server library. Prior to 0.62.5, russh dispatches channel-scoped Handler callbacks for recipient channel IDs that were never opened or confirmed in russh/src/server/encrypted.rs, server_read_authenticated, and the exec_request callback. Version 0.62.5 fixes the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:14 | rust-russh | 0.64.1-1 | DEBIAN-CVE-2026-68930 |
Affected products (as reported)
Weakness: CWE-666, CWE-696, CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
References
- https://github.com/Eugeny/russh/security/advisories/GHSA-m65r-rprj-r5rg x_refsource_CONFIRM
- https://github.com/Eugeny/russh/commit/7c5659f8cf6f6f2f9989d12dba0ebf49dc50a171 x_refsource_MISC
- https://github.com/Eugeny/russh/releases/tag/v0.62.5 x_refsource_MISC