CVE-2026-46702
Russh: Post-decompression SSH packet size was not bounded, allowing remote oversized compressed packets
Description
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.
INFO
Published Date :
June 10, 2026, 10:17 p.m.
Last Modified :
July 23, 2026, 9:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE |
Solution
- Update Russh library to version 0.61.1 or later.
- Disable SSH compression if updating is not possible.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-46702.
| URL | Resource |
|---|---|
| https://github.com/Eugeny/russh/security/advisories/GHSA-wwx6-x28x-8259 | |
| https://github.com/Eugeny/russh/security/advisories/GHSA-wwx6-x28x-8259 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-46702 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-46702
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-46702 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-46702 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 23, 2026
Action Type Old Value New Value Added Translation Title: Russh de Eugeny, Description: Russh es una biblioteca de cliente y servidor SSH de Rust. Desde la versión 0.34.0 hasta antes de la versión 0.61.1, cuando la compresión SSH está habilitada, russh aceptaba paquetes comprimidos cuyo tamaño en la red pasaba las comprobaciones normales de longitud de paquete de transporte, pero cuyo tamaño descomprimido era mucho mayor. Esto permitía a un par remoto enviar paquetes post-descompresión de tamaño excesivo que deberían haber sido rechazados. En las versiones actuales, esto es un problema de denegación de servicio remota / agotamiento de recursos en la ruta de recepción post-descompresión. En versiones anteriores a la 0.58.0, la misma ruta de descompresión remota utilizaba CryptoVec, lo que parece empeorar el impacto histórico. Este problema ha sido parcheado en la versión 0.61.1. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Eugeny', 'product': 'russh', 'versions': [{'status': 'affected', 'version': '>= 0.34.0, < 0.61.1'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-46702', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-11T12:30:06.205533Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 11, 2026
Action Type Old Value New Value Added Reference https://github.com/Eugeny/russh/security/advisories/GHSA-wwx6-x28x-8259 -
New CVE Received by [email protected]
Jun. 10, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-770 Added Reference https://github.com/Eugeny/russh/security/advisories/GHSA-wwx6-x28x-8259