CVE-2026-102822
CVE-2026-102822 · russh: negotiating a MAC-requiring block cipher (CTR/CBC) with mac=none causes a slice-index-out-of-range panic
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 3.7 · Low · EPSS 0.3% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
russh
- Versions
- < 0.63.1: Affected
No fix published
rust-russh Debian:14
- Versions
- 0.57.1-1
- 0.57.1-2
- Affected ranges
- ECOSYSTEM: < 0.64.1-1
Update to 0.64.1-1
rust-russh Ubuntu:26.10
- Versions
- 0.57.1-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published