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russh: negotiating a MAC-requiring block cipher (CTR/CBC) with mac=none causes a slice-index-out-of-range panic

Type: advisorySource: Official CVE ListRisk context updated1 source record

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.

Announced Source revision 2
Original source ↗
CVE context updated. The publisher announcement is unchanged.

CVE-2026-102822

Primary source · Revision 2

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-102822

russh

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "Eugeny",
    "product": "russh",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.63.1"
      }
    ]
  }
]
Related CVEs
CVE-2026-102822

Source reference: /cveMetadata/cveId

Publisher severity

low

Source reference: /containers/cna/metrics

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-102822 · Low

russh

Event
#51900 · Revision 2
Added to Heist Feed
Publisher date
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