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DEBIAN-CVE-2026-40356

Type: advisorySource: OSV1 source record

In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, possibly causing the process to terminate in parse_message.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-40356

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-2026-40356

krb5

Source reference: /affected/0/package/name

Affected versions
1.20.1-2

Source reference: /affected/0/versions

1.20.1-2+deb12u1

Source reference: /affected/0/versions

1.20.1-2+deb12u2

Source reference: /affected/0/versions

1.20.1-2+deb12u3

Source reference: /affected/0/versions

1.20.1-2+deb12u4

Source reference: /affected/0/versions

Fixed versions
1.20.1-2+deb12u5

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

krb5

Source reference: /affected/1/package/name

Affected versions
1.21.3-5

Source reference: /affected/1/versions

Fixed versions
1.21.3-5+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

krb5

Source reference: /affected/2/package/name

Affected versions
1.21.3-5

Source reference: /affected/2/versions

1.22.1-1

Source reference: /affected/2/versions

1.22.1-2

Source reference: /affected/2/versions

Fixed versions
1.22.1-2.1

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"
          },
          {
            "fixed": "1.20.1-2+deb12u5"
          }
        ]
      }
    ],
    "package": {
      "name": "krb5",
      "purl": "pkg:deb/debian/krb5?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "1.20.1-2",
      "1.20.1-2+deb12u1",
      "1.20.1-2+deb12u2",
      "1.20.1-2+deb12u3",
      "1.20.1-2+deb12u4"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40356.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.21.3-5+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "krb5",
      "purl": "pkg:deb/debian/krb5?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1.21.3-5"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40356.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.22.1-2.1"
          }
        ]
      }
    ],
    "package": {
      "name": "krb5",
      "purl": "pkg:deb/debian/krb5?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.21.3-5",
      "1.22.1-1",
      "1.22.1-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40356.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#56484 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-40356 · Revision 1Source updated