{
  "cveId": "CVE-2026-40686",
  "url": "https://patchblox.com/security/cve/CVE-2026-40686",
  "summary": "CVE-2026-40686 is fixed in 6 products on 1 platform, first by exim4 4.99.1-1ubuntu1.1, released April 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "exim4: In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing charac...",
  "description": "In Exim before 4.99.2, when utf8 operators are enabled, there is an out-of-bounds read if large UTF-8 trailing characters are present (malformed UTF-8 header data). Information might be divulged within an error message produced during handling of an unrelated e-mail message.",
  "published": "2026-04-29T05:00:00Z",
  "severity": "medium",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
  "epss": 0.00246,
  "epssPercentile": 0.15958,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "exim4",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "4.96-15\u002Bdeb12u9",
      "fix": "DEBIAN-CVE-2026-40686",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-40686",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "exim4",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "4.98.2-1\u002Bdeb13u2",
      "fix": "DEBIAN-CVE-2026-40686",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-40686",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "exim4",
      "release": "Debian 14",
      "fixedVersion": "4.99.2-1",
      "fix": "DEBIAN-CVE-2026-40686",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-40686",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "exim4",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "4.93-13ubuntu1.12\u002Besm1",
      "fix": "exim4 4.93-13ubuntu1.12\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-exim4-4.93-13ubuntu1.12-esm1",
      "released": "2026-06-24T14:07:32Z"
    },
    {
      "platform": "linux",
      "product": "exim4",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "4.95-4ubuntu2.7",
      "fix": "exim4 4.95-4ubuntu2.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-exim4-4.95-4ubuntu2.7",
      "released": "2026-05-15T16:01:26Z"
    },
    {
      "platform": "linux",
      "product": "exim4",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "4.97-4ubuntu4.4",
      "fix": "exim4 4.97-4ubuntu4.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-exim4-4.97-4ubuntu4.4",
      "released": "2026-05-15T16:01:30Z"
    },
    {
      "platform": "linux",
      "product": "exim4",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "4.98.2-1ubuntu2.1",
      "fix": "exim4 4.98.2-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-exim4-4.98.2-1ubuntu2.1",
      "released": "2026-05-15T16:01:35Z"
    },
    {
      "platform": "linux",
      "product": "exim4",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.99.1-1ubuntu1.1",
      "fix": "exim4 4.99.1-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-exim4-4.99.1-1ubuntu1.1",
      "released": "2026-04-29T05:00:00Z"
    },
    {
      "platform": "linux",
      "product": "exim4-base",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "4.93-13ubuntu1.12\u002Besm1",
      "fix": "exim4-base 4.93-13ubuntu1.12\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-exim4-base-4.93-13ubuntu1.12-esm1",
      "released": "2026-06-24T14:07:32Z"
    },
    {
      "platform": "linux",
      "product": "exim4-base",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "4.95-4ubuntu2.7",
      "fix": "exim4-base 4.95-4ubuntu2.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-exim4-base-4.95-4ubuntu2.7",
      "released": "2026-05-15T16:01:26Z"
    },
    {
      "platform": "linux",
      "product": "exim4-base",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "4.97-4ubuntu4.4",
      "fix": "exim4-base 4.97-4ubuntu4.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-exim4-base-4.97-4ubuntu4.4",
      "released": "2026-05-15T16:01:30Z"
    },
    {
      "platform": "linux",
      "product": "exim4-base",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "4.98.2-1ubuntu2.1",
      "fix": "exim4-base 4.98.2-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-exim4-base-4.98.2-1ubuntu2.1",
      "released": "2026-05-15T16:01:35Z"
    },
    {
      "platform": "linux",
      "product": "exim4-base",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.99.1-1ubuntu1.1",
      "fix": "exim4-base 4.99.1-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-exim4-base-4.99.1-1ubuntu1.1",
      "released": "2026-04-29T05:00:00Z"
    },
    {
      "platform": "linux",
      "product": "exim4-config",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "4.93-13ubuntu1.12\u002Besm1",
      "fix": "exim4-config 4.93-13ubuntu1.12\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-exim4-config-4.93-13ubuntu1.12-esm1",
      "released": "2026-06-24T14:07:32Z"
    },
    {
      "platform": "linux",
      "product": "exim4-config",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "4.95-4ubuntu2.7",
      "fix": "exim4-config 4.95-4ubuntu2.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-exim4-config-4.95-4ubuntu2.7",
      "released": "2026-05-15T16:01:26Z"
    },
    {
      "platform": "linux",
      "product": "exim4-config",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "4.97-4ubuntu4.4",
      "fix": "exim4-config 4.97-4ubuntu4.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-exim4-config-4.97-4ubuntu4.4",
      "released": "2026-05-15T16:01:30Z"
    },
    {
      "platform": "linux",
      "product": "exim4-config",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "4.98.2-1ubuntu2.1",
      "fix": "exim4-config 4.98.2-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-exim4-config-4.98.2-1ubuntu2.1",
      "released": "2026-05-15T16:01:35Z"
    },
    {
      "platform": "linux",
      "product": "exim4-config",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.99.1-1ubuntu1.1",
      "fix": "exim4-config 4.99.1-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-exim4-config-4.99.1-1ubuntu1.1",
      "released": "2026-04-29T05:00:00Z"
    },
    {
      "platform": "linux",
      "product": "exim4-daemon-heavy",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "4.93-13ubuntu1.12\u002Besm1",
      "fix": "exim4-daemon-heavy 4.93-13ubuntu1.12\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-exim4-daemon-heavy-4.93-13ubuntu1.12-esm1",
      "released": "2026-06-24T14:07:32Z"
    },
    {
      "platform": "linux",
      "product": "exim4-daemon-heavy",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "4.95-4ubuntu2.7",
      "fix": "exim4-daemon-heavy 4.95-4ubuntu2.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-exim4-daemon-heavy-4.95-4ubuntu2.7",
      "released": "2026-05-15T16:01:26Z"
    },
    {
      "platform": "linux",
      "product": "exim4-daemon-heavy",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "4.97-4ubuntu4.4",
      "fix": "exim4-daemon-heavy 4.97-4ubuntu4.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-exim4-daemon-heavy-4.97-4ubuntu4.4",
      "released": "2026-05-15T16:01:30Z"
    },
    {
      "platform": "linux",
      "product": "exim4-daemon-heavy",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "4.98.2-1ubuntu2.1",
      "fix": "exim4-daemon-heavy 4.98.2-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-exim4-daemon-heavy-4.98.2-1ubuntu2.1",
      "released": "2026-05-15T16:01:35Z"
    },
    {
      "platform": "linux",
      "product": "exim4-daemon-heavy",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.99.1-1ubuntu1.1",
      "fix": "exim4-daemon-heavy 4.99.1-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-exim4-daemon-heavy-4.99.1-1ubuntu1.1",
      "released": "2026-04-29T05:00:00Z"
    },
    {
      "platform": "linux",
      "product": "exim4-daemon-light",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "4.93-13ubuntu1.12\u002Besm1",
      "fix": "exim4-daemon-light 4.93-13ubuntu1.12\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-exim4-daemon-light-4.93-13ubuntu1.12-esm1",
      "released": "2026-06-24T14:07:32Z"
    },
    {
      "platform": "linux",
      "product": "exim4-daemon-light",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "4.95-4ubuntu2.7",
      "fix": "exim4-daemon-light 4.95-4ubuntu2.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-exim4-daemon-light-4.95-4ubuntu2.7",
      "released": "2026-05-15T16:01:26Z"
    },
    {
      "platform": "linux",
      "product": "exim4-daemon-light",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "4.97-4ubuntu4.4",
      "fix": "exim4-daemon-light 4.97-4ubuntu4.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-exim4-daemon-light-4.97-4ubuntu4.4",
      "released": "2026-05-15T16:01:30Z"
    },
    {
      "platform": "linux",
      "product": "exim4-daemon-light",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "4.98.2-1ubuntu2.1",
      "fix": "exim4-daemon-light 4.98.2-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-exim4-daemon-light-4.98.2-1ubuntu2.1",
      "released": "2026-05-15T16:01:35Z"
    },
    {
      "platform": "linux",
      "product": "exim4-daemon-light",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.99.1-1ubuntu1.1",
      "fix": "exim4-daemon-light 4.99.1-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-exim4-daemon-light-4.99.1-1ubuntu1.1",
      "released": "2026-04-29T05:00:00Z"
    },
    {
      "platform": "linux",
      "product": "eximon4",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "4.93-13ubuntu1.12\u002Besm1",
      "fix": "eximon4 4.93-13ubuntu1.12\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-eximon4-4.93-13ubuntu1.12-esm1",
      "released": "2026-06-24T14:07:32Z"
    },
    {
      "platform": "linux",
      "product": "eximon4",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "4.95-4ubuntu2.7",
      "fix": "eximon4 4.95-4ubuntu2.7",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-eximon4-4.95-4ubuntu2.7",
      "released": "2026-05-15T16:01:26Z"
    },
    {
      "platform": "linux",
      "product": "eximon4",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "4.97-4ubuntu4.4",
      "fix": "eximon4 4.97-4ubuntu4.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-eximon4-4.97-4ubuntu4.4",
      "released": "2026-05-15T16:01:30Z"
    },
    {
      "platform": "linux",
      "product": "eximon4",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "4.98.2-1ubuntu2.1",
      "fix": "eximon4 4.98.2-1ubuntu2.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-eximon4-4.98.2-1ubuntu2.1",
      "released": "2026-05-15T16:01:35Z"
    },
    {
      "platform": "linux",
      "product": "eximon4",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "4.99.1-1ubuntu1.1",
      "fix": "eximon4 4.99.1-1ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-eximon4-4.99.1-1ubuntu1.1",
      "released": "2026-04-29T05:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}