{
  "fix": "SUSE-SU-2026:4139-1",
  "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4139-1",
  "summary": "SUSE-SU-2026:4139-1, released September 14, 2026, fixes 34 CVEs in dovecot23 (version 2.3.21.1-150200.76.1). None of them is reported as exploited. Patch Radar priority: High.",
  "platform": "linux",
  "type": "advisory",
  "title": "dovecot23 security update",
  "released": "2026-09-14T07:22:32Z",
  "priority": "High",
  "priorityTier": 3,
  "priorityReason": "Closes CVE-2024-23185, high severity",
  "supported": true,
  "cveCount": 34,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.01295,
  "maxCvss": 9.1,
  "vendorAdvisory": "https://osv.dev/vulnerability/SUSE-SU-2026:4139-1",
  "appliesTo": [
    {
      "product": "dovecot23",
      "productUrl": "https://patchblox.com/security/product/linux/dovecot23",
      "release": "sles 15.6",
      "fixedVersion": "2.3.21.1-150200.76.1",
      "supported": true
    },
    {
      "product": "dovecot23",
      "productUrl": "https://patchblox.com/security/product/linux/dovecot23",
      "release": "sles 15.7",
      "fixedVersion": "2.3.21.1-150200.76.1",
      "supported": true
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2024-23185",
      "url": "https://patchblox.com/security/cve/CVE-2024-23185",
      "title": "dovecot23: large headers can cause resource exhaustion when parsing message (bsc#1229183).",
      "priority": "High",
      "severity": "Medium",
      "cvss": 7.5,
      "epss": 0.01295,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-27858",
      "url": "https://patchblox.com/security/cve/CVE-2026-27858",
      "title": "dovecot23: pigeonhole: managesieve-login can allocate large amount of memory during authentication (bsc#1260901).",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 7.5,
      "epss": 0.00804,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-59032",
      "url": "https://patchblox.com/security/cve/CVE-2025-59032",
      "title": "dovecot23: pigeonhole: ManageSieve panic occurs with sieve-connect as a client (bsc#1260902).",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 7.5,
      "epss": 0.0073,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-27857",
      "url": "https://patchblox.com/security/cve/CVE-2026-27857",
      "title": "dovecot23: sending excessive parenthesis causes imap-login to use excessive memory (bsc#1260898).",
      "priority": "High",
      "severity": "IMPORTANT",
      "cvss": 7.5,
      "epss": 0.00679,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-42006",
      "url": "https://patchblox.com/security/cve/CVE-2026-42006",
      "title": "dovecot: An attacker can cause uncontrolled memory usage with excessive bracing over IMAP",
      "priority": "High",
      "severity": "important",
      "cvss": 7.5,
      "epss": 0.00621,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-33263",
      "url": "https://patchblox.com/security/cve/CVE-2026-33263",
      "title": "dovecot: When mail_max_userip_connections is set (default 10) and reached, submission-login can crash with epoll() panic cause...",
      "priority": "High",
      "severity": "important",
      "cvss": 9.1,
      "epss": 0.00554,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-59028",
      "url": "https://patchblox.com/security/cve/CVE-2025-59028",
      "title": "dovecot23: Invalid base64 authentication can cause DoS for other logins (bsc#1260894).",
      "priority": "High",
      "severity": "high",
      "cvss": 7.5,
      "epss": 0.00464,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-33605",
      "url": "https://patchblox.com/security/cve/CVE-2026-33605",
      "title": "dovecot: An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authe...",
      "priority": "High",
      "severity": "important",
      "cvss": 9.1,
      "epss": 0.00449,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-42391",
      "url": "https://patchblox.com/security/cve/CVE-2026-42391",
      "title": "dovecot: An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in, whi...",
      "priority": "High",
      "severity": "important",
      "cvss": 9.1,
      "epss": 0.00449,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-27852",
      "url": "https://patchblox.com/security/cve/CVE-2026-27852",
      "title": "dovecot23: DoS by sending mail with bad header (bsc#1276799).",
      "priority": "High",
      "severity": "high",
      "cvss": 9.1,
      "epss": 0.0043,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-40019",
      "url": "https://patchblox.com/security/cve/CVE-2026-40019",
      "title": "dovecot: An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which makes it spi...",
      "priority": "High",
      "severity": "important",
      "cvss": 9.1,
      "epss": 0.00371,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-42007",
      "url": "https://patchblox.com/security/cve/CVE-2026-42007",
      "title": "dovecot: An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-after-fr...",
      "priority": "High",
      "severity": "important",
      "cvss": 9.1,
      "epss": 0.00345,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-73208",
      "url": "https://patchblox.com/security/cve/CVE-2026-73208",
      "title": "dovecot: An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token respon...",
      "priority": "High",
      "severity": "important",
      "cvss": 9.1,
      "epss": 0.00312,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2024-23184",
      "url": "https://patchblox.com/security/cve/CVE-2024-23184",
      "title": "dovecot23: parsing of messages containing many address headers (From, To, Cc, Bcc, etc.) could be excessively CPU",
      "priority": "Routine",
      "severity": "MODERATE",
      "cvss": 6.5,
      "epss": 0.00846,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-33607",
      "url": "https://patchblox.com/security/cve/CVE-2026-33607",
      "title": "dovecot23: IMAP LIST match_sub() Exponential Backtracking -- CPU Denial of Service (bsc#1276795).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00554,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-40015",
      "url": "https://patchblox.com/security/cve/CVE-2026-40015",
      "title": "dovecot23: imap-hibernate can be crashed (bsc#1276812).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00554,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-27856",
      "url": "https://patchblox.com/security/cve/CVE-2026-27856",
      "title": "dovecot23: Doveadm credentials were not checked using timing-safe checking function (bsc#1260899).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 5.9,
      "epss": 0.00399,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-52687",
      "url": "https://patchblox.com/security/cve/CVE-2026-52687",
      "title": "dovecot23: IMAP: COMPRESS ZSTD can cause excessive memory usage (bsc#1276837).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 6.5,
      "epss": 0.00398,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-73209",
      "url": "https://patchblox.com/security/cve/CVE-2026-73209",
      "title": "dovecot23: imap-login crash: Self-recursion on zero-output decompress chunks (bsc#1276833).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 6.5,
      "epss": 0.00398,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-27859",
      "url": "https://patchblox.com/security/cve/CVE-2026-27859",
      "title": "dovecot23: excessive RFC 2231 MIME parameters in email would can excessive CPU usage (bsc#1260897).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 5.3,
      "epss": 0.00381,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-42395",
      "url": "https://patchblox.com/security/cve/CVE-2026-42395",
      "title": "dovecot23: Single NUL-Byte XCLIENT FORWARD Payload Crashes (bsc#1276826).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00352,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-40016",
      "url": "https://patchblox.com/security/cve/CVE-2026-40016",
      "title": "dovecot23: Sieve :contains/:matches O(NxM) substring match bypasses sieve_max_cpu_time limit (bsc#1265148).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 6.5,
      "epss": 0.00338,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-40014",
      "url": "https://patchblox.com/security/cve/CVE-2026-40014",
      "title": "dovecot23: CPU DoS via Crafted References Header (bsc#1276804).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 6.5,
      "epss": 0.00334,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-27855",
      "url": "https://patchblox.com/security/cve/CVE-2026-27855",
      "title": "dovecot23: OTP driver vulnerable to replay attack (bsc#1260900).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 5.9,
      "epss": 0.00316,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-33604",
      "url": "https://patchblox.com/security/cve/CVE-2026-33604",
      "title": "dovecot23: SMTP Smuggling via Missing Dot-Stuffing (bsc#1276802).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 5.9,
      "epss": 0.00314,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-52681",
      "url": "https://patchblox.com/security/cve/CVE-2026-52681",
      "title": "dovecot23: Sieve resource usage tracking lost when active script changes (bsc#1276828).",
      "priority": "Routine",
      "severity": "low",
      "cvss": 3.1,
      "epss": 0.00296,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2025-59031",
      "url": "https://patchblox.com/security/cve/CVE-2025-59031",
      "title": "dovecot23: decode2text.sh OOXML extraction may follow symlinks and read unintended files during indexing",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00294,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-40020",
      "url": "https://patchblox.com/security/cve/CVE-2026-40020",
      "title": "dovecot23: IMAP folders can be shared-spammed to everyone (bsc#1265149).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.0026,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-40203",
      "url": "https://patchblox.com/security/cve/CVE-2026-40203",
      "title": "dovecot23: IMAP Compression Can Reveal Whether a Small Synced Email Body Matches Sender-Chosen Text",
      "priority": "Routine",
      "severity": "low",
      "cvss": 3.7,
      "epss": 0.00257,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-33606",
      "url": "https://patchblox.com/security/cve/CVE-2026-33606",
      "title": "dovecot23: dsync: Mail content can cause dsync protocol injection (bsc#1276800).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.8,
      "epss": 0.00246,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-42008",
      "url": "https://patchblox.com/security/cve/CVE-2026-42008",
      "title": "dovecot23: XCLIENT FORWARD= bare token not namespaced (bsc#1276824).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 4.3,
      "epss": 0.00236,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-33603",
      "url": "https://patchblox.com/security/cve/CVE-2026-33603",
      "title": "dovecot23: login: base64 input can contain tabs that bypass IPC protection (bsc#1265147).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 5.3,
      "epss": 0.00214,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-40205",
      "url": "https://patchblox.com/security/cve/CVE-2026-40205",
      "title": "dovecot23: OAuth2 passdb scope enforcement bypass via OR semantics in remote validation path (bsc#1276820).",
      "priority": "Routine",
      "severity": "medium",
      "cvss": 5.9,
      "epss": 0.00211,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-42393",
      "url": "https://patchblox.com/security/cve/CVE-2026-42393",
      "title": "dovecot23: doveadm_password or api key length can still be leaked with timing comparisons (bsc#1276827).",
      "priority": "Routine",
      "severity": "low",
      "cvss": 3.1,
      "epss": 0.00173,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-11T01:43:54Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}