What’s Vulnerable › Vulnerabilities

CVE-2026-68930: Russh: Channel-scoped server callbacks can be reached without an open channel

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-03 · updated 2026-10-23
• Weakness: CWE-666

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 products

• Eugeny russh: before 0.62.5

References

• https://github.com/Eugeny/russh/commit/7c5659f8cf6f6f2f9989d12dba0ebf49dc50a171
• https://github.com/Eugeny/russh/releases/tag/v0.62.5
• https://github.com/Eugeny/russh/security/advisories/GHSA-m65r-rprj-r5rg
• https://github.com/Eugeny/russh/security/advisories/GHSA-m65r-rprj-r5rg

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