CVE-2026-102822
lowRussh is a Rust SSH client and server library.
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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/Eugeny/russh/commit/2885385abfee279092a41d80c6cb6ac367353159 security-advisories@github.com
- https://github.com/Eugeny/russh/releases/tag/v0.63.1 security-advisories@github.com
- https://github.com/Eugeny/russh/security/advisories/GHSA-p8qx-h547-fjw9 security-advisories@github.com
- https://github.com/Eugeny/russh/security/advisories/GHSA-p8qx-h547-fjw9 134c704f-9b21-4f2e-91b3-4a467353bcc0