Russh: SSH message fields were decoded through allocation-first parsers before field-specific bounds
CVE-2026-48110

7.5HIGH

Key Information:

Vendor

Eugeny

Status
Russh
Vendor
CVE Published:
10 June 2026

What is CVE-2026-48110?

Russh is a Rust SSH client & server library. From version 0.34.0 to before version 0.61.0, several russh client and server message handlers decoded attacker-controlled SSH strings, name-lists, and byte fields into owned allocations before applying field-specific bounds. A remote SSH peer could send oversized, high-fanout, or malformed length-prefixed fields and make the library allocate, attempt to allocate, or split data before rejecting input that should have been rejected earlier. This issue has been patched in version 0.61.0.

Affected Version(s)

russh >= 0.34.0, < 0.61.0

References

https://github.com/Eugeny/russh/security/advisories/GHSA-...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.