Eugeny russh up to 0.61.0 Decompression allocation of resources

Summaryinfo

A vulnerability has been found in Eugeny russh up to 0.61.0 and classified as problematic. This affects an unknown part of the component Decompression Handler. Performing a manipulation results in allocation of resources. This vulnerability is reported as CVE-2026-46702. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Eugeny russh up to 0.61.0. This affects an unknown part of the component Decompression Handler. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-46702 since 05/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 320686 (Linux Distros Unpatched Vulnerability : CVE-2026-46702), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.61.1 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (320686) and EUVD (EUVD-2026-36125). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Eugeny

Name

• russh

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35
• 0.36
• 0.37
• 0.38
• 0.39
• 0.40
• 0.41
• 0.42
• 0.43
• 0.44
• 0.45
• 0.46
• 0.47
• 0.48
• 0.49
• 0.50
• 0.51
• 0.52
• 0.53
• 0.54
• 0.55
• 0.56
• 0.57
• 0.58
• 0.59
• 0.60
• 0.61.0

Website

• Product: https://github.com/Eugeny/russh/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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