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.

CVSS 3.1

3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS

0.3% chance of exploitation in the next 30 days; higher than 25% of CVEs (scores of 2026-10-25)

CWE

CWE-129

Published

2026-09-29

Modified

2026-09-29

Record from

the NVD, synced 2026-10-19

Packages (OSV)

References

• https://github.com/Eugeny/russh/commit/2885385abfee279092a41d80c6cb6ac367353159
• https://github.com/Eugeny/russh/releases/tag/v0.63.1
• https://github.com/Eugeny/russh/security/advisories/GHSA-p8qx-h547-fjw9
• https://github.com/Eugeny/russh/security/advisories/GHSA-p8qx-h547-fjw9

Check your stackJSON