UnratedFix available

DEBIAN-CVE-2026-54548

Type: advisorySource: OSV1 source record

kas is a setup tool for bitbake based projects. Prior to 5.4, internal SSH key setup triggered by SSH_PRIVATE_KEY or SSH_PRIVATE_KEY_FILE creates ~/.ssh/config when no user-specific SSH configuration exists and adds a global Host * rule containing StrictHostKeyChecking no. In kas/libcmds.py, ssh_no_host_key_check() runs without checking ctx.managed_env, so the setting persists after kas exits and affects future SSH sessions by the same local user, extending beyond the intended short-lived continuous integration environment. A later SSH connection can therefore accept an attacker-controlled host key without verification, increasing the risk of a man-in-the-middle attack that compromises session confidentiality or integrity. This issue is fixed in version 5.4.

Announced 26 Aug 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-54548

Primary source · Revision 1

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

Security context

Source reference: osv:DEBIAN-CVE-2026-54548

kas

Source reference: /affected/0/package/name

Affected versions: 3.1-2
Source reference: /affected/0/versions
3.2.3-1
Source reference: /affected/0/versions
4.0-1
Source reference: /affected/0/versions
4.3-1
Source reference: /affected/0/versions
4.3.2-1
Source reference: /affected/0/versions
4.4-1
Source reference: /affected/0/versions
4.4-2
Source reference: /affected/0/versions
4.5-1
Source reference: /affected/0/versions
4.5-2
Source reference: /affected/0/versions
4.6-1
Source reference: /affected/0/versions
4.7-1
Source reference: /affected/0/versions
4.8.1-1
Source reference: /affected/0/versions
4.8.1-2
Source reference: /affected/0/versions
4.8.2-1
Source reference: /affected/0/versions
5.0-1
Source reference: /affected/0/versions
5.1-1
Source reference: /affected/0/versions
5.2-1
Source reference: /affected/0/versions
5.3-1
Source reference: /affected/0/versions
5.4-1
Source reference: /affected/0/versions
5.5-1
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

kas

Source reference: /affected/1/package/name

Affected versions: 4.8.1-2
Source reference: /affected/1/versions
4.8.2-1
Source reference: /affected/1/versions
5.0-1
Source reference: /affected/1/versions
5.1-1
Source reference: /affected/1/versions
5.2-1
Source reference: /affected/1/versions
5.3-1
Source reference: /affected/1/versions
5.4-1
Source reference: /affected/1/versions
5.5-1
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

kas

Source reference: /affected/2/package/name

Affected versions: 4.8.1-2
Source reference: /affected/2/versions
4.8.2-1
Source reference: /affected/2/versions
5.0-1
Source reference: /affected/2/versions
5.1-1
Source reference: /affected/2/versions
5.2-1
Source reference: /affected/2/versions
5.3-1
Source reference: /affected/2/versions
Fixed versions: 5.4-1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "kas",
      "purl": "pkg:deb/debian/kas?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "3.1-2",
      "3.2.3-1",
      "4.0-1",
      "4.3-1",
      "4.3.2-1",
      "4.4-1",
      "4.4-2",
      "4.5-1",
      "4.5-2",
      "4.6-1",
      "4.7-1",
      "4.8.1-1",
      "4.8.1-2",
      "4.8.2-1",
      "5.0-1",
      "5.1-1",
      "5.2-1",
      "5.3-1",
      "5.4-1",
      "5.5-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54548.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "kas",
      "purl": "pkg:deb/debian/kas?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "4.8.1-2",
      "4.8.2-1",
      "5.0-1",
      "5.1-1",
      "5.2-1",
      "5.3-1",
      "5.4-1",
      "5.5-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54548.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "5.4-1"
          }
        ]
      }
    ],
    "package": {
      "name": "kas",
      "purl": "pkg:deb/debian/kas?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "4.8.1-2",
      "4.8.2-1",
      "5.0-1",
      "5.1-1",
      "5.2-1",
      "5.3-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54548.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #57851 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 17:31:12 GMT
Publisher date: Wed, 26 Aug 2026 15:16:49 GMT

Read the original announcement

Revision history

25 Oct 2026DEBIAN-CVE-2026-54548 · Revision 1Source updated