Vulnerability in Eugeny Russh
CVE-2026-102822
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Eugeny Russh — versions < 0.63.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-102822?
- CVE-2026-102822 is a low-severity vulnerability in Eugeny Russh, classified under Improper Validation of Array Index. CVSS score: 3.7/10. Published 2026-09-29.
- How severe is CVE-2026-102822?
- Low severity. CVSS v3 base score is 3.7 out of 10.