CVE-2026-116696 Details
Description
russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.65.0, russh::keys::agent::server::serve in russh/src/keys/agent/server.rs accepts repeated SSH_AGENT_CONSTRAIN_CONFIRM records while adding a key and appends every Constraint::Confirm record to the key's retained constraint vector without a count or memory limit. A process that can connect to the agent socket, including the remote side of a forwarded agent session, can repeatedly add constrained keys and cause renewable memory growth that persists for the process lifetime because keys without a lifetime constraint do not expire. This issue is fixed in version 0.65.0.
A memory allocation vulnerability has been identified in the russh SSH client and server library, specifically in the agent server component prior to version 0.65.0. The issue arises in the 'russh::keys::agent::server::serve' function, which processes SSH_AGENT_CONSTRAIN_CONFIRM records without limit. This unbounded handling allows a connected process to repeatedly add constrained keys, leading to persistent memory growth for the duration of the process, as keys lacking a lifetime constraint do not expire. The vulnerability can be exploited by any process that can access the agent socket, including through forwarded agent sessions.
Users can upgrade to russh version 0.65.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 27, 2026CISA-ADP
Assessed Nov 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/Eugeny/russh/security/advisories/GHSA-9wfm-jcj8-jfv9 | CISA-ADP | AdvisoryBundleExploitRemedyVendor |
| https://github.com/Eugeny/russh/commit/23aa5d28fe9601c5bdfe9e60b7ec5d4f882c3de6 | [email protected] | Source CodeVendor |
| https://github.com/Eugeny/russh/releases/tag/v0.65.0 | [email protected] | Release NotesVendor |
| https://github.com/Eugeny/russh/security/advisories/GHSA-9wfm-jcj8-jfv9 | [email protected] | AdvisoryBundleExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Eugeny russh | < 0.65 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 2, 2026 | CVE Modified | CISA-ADP |
| Oct 27, 2026 | New CVE Received | [email protected] |