Russh: Post-decompression SSH packet size was not bounded, allowing remote oversized compressed packets
CVE-2026-46702

7.5HIGH

Key Information:

Vendor

Eugeny

Status
Russh
Vendor
CVE Published:
10 June 2026

What is CVE-2026-46702?

Russh is a Rust SSH client & server library. From version 0.34.0 to before version 0.61.1, when SSH compression is enabled, russh accepted compressed packets whose on-wire size passed the normal transport packet-length checks but whose decompressed size was much larger. This allowed a remote peer to send oversized post-decompression packets that should have been rejected. In current releases, this is a remote denial-of-service / resource-exhaustion issue in the post-decompression receive path. In older releases before 0.58.0, the same remote decompression path used CryptoVec, which appears to make the historical impact worse. This issue has been patched in version 0.61.1.

Affected Version(s)

russh >= 0.34.0, < 0.61.1

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

.