CVE-2026-102822: CWE-129: Improper Validation of Array Index in Eugeny russh
Russh is a Rust SSH client and server library. Prior to 0.63.1, a connection configured to permit mac=none can negotiate it with a MAC-requiring CTR or CBC block cipher because the selection logic validates needs_mac() only when MAC selection fails. A remote peer can then send a packet with a decrypted length of zero, causing russh/src/cipher/mod.rs to shrink the previously read block before indexing buffer.buffer[16..], which panics and terminates the connection task. This issue is fixed in version 0.63.1.
CVE-2026-102822: CWE-129: Improper Validation of Array Index in Eugeny russh
Description
Russh is a Rust SSH client and server library. Prior to 0.63.1, a connection configured to permit mac=none can negotiate it with a MAC-requiring CTR or CBC block cipher because the selection logic validates needs_mac() only when MAC selection fails. A remote peer can then send a packet with a decrypted length of zero, causing russh/src/cipher/mod.rs to shrink the previously read block before indexing buffer.buffer[16..], which panics and terminates the connection task. This issue is fixed in version 0.63.1.
CVSS v3.1
Score 3.7low
Affected software
Eugeny
russh
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-29T17:25:25.265Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6abc0552680226ef681dfaf3
Added to database: 09/29/2026, 18:37:06 UTC
Last updated: 09/29/2026, 18:37:06 UTC
Views: 1
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