CVE-2026-27852VulnerabilityPublished 1 Sep 2026Updated 10 Nov 2026

SUSE · Security update for dovecot24

Affects SUSESource GCVE Database

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Authoritative record:CVE-2026-27852· High 7.5

Not known to be exploited · CVSS 7.5 High · fixed in SUSE package updates : patch SUSE soon.

Data as of 10 Nov 2026, 20:06 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

Patch: Available – fixed in 3.1.6, 3.0.7, 2.3.22.2 +1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade OX Dovecot to 3.1.6, 3.0.7 or 2.3.22.2 (Pro); 2.4.5 (CE).

Affected software

Product	Affected	Fixed in
Open-Xchange GmbHOX Dovecot Pro	Affected >=3.1.0 <3.1.6	Fixed in 3.1.6
Open-Xchange GmbHOX Dovecot Pro	Affected >=3.0.0 <3.0.7	Fixed in 3.0.7
Open-Xchange GmbHOX Dovecot Pro	Affected >=2.3.0 <2.3.22.2	Fixed in 2.3.22.2
Open-Xchange GmbHOX Dovecot CE	Affected >=2.3.0 <2.4.5	Fixed in 2.4.5

Description

This update for dovecot24 fixes the following issues: Update to 2.4.5. - CVE-2026-33263: `submission-login`: panic when `mail_max_userip_connections` is reached (bsc#1276794). - CVE-2026-27852: DoS by sending mail with bad header (bsc#1276799). - CVE-2026-33604: SMTP smuggling via missing dot-stuffing after bare carriage return (bsc#1276802). - CVE-2026-33605: `managesieve-login`: pre-auth crash (bsc#1276809). - CVE-2026-33606: `dsync`: mail content can cause `dsync` protocol injection (bsc#1276800). - CVE-2026-33607: IMAP `LIST` `match_sub()` exponential backtracking leading to CPU denial of service (bsc#1276795). - CVE-2026-40013: stack buffer underflow in `pigeonhole` `ManageSieve` `CHECKSCRIPT/PUTSCRIPT` (bsc#1276807). - CVE-2026-40014: CPU DoS via crafted references header (bsc#1276804). - CVE-2026-40015: `imap-hibernate` can be crashed (bsc#1276812). - CVE-2026-40017: CPU DoS via CRC32 hash collision in `strmap` (bsc#1276813). - CVE-2026-40018: MySQL multi-byte escaping performed incorrectly (bsc#1276810). - CVE-2026-40203: IMAP compression can reveal whether a small synced email body matches sender-chosen text (bsc#1276815). - CVE-2026-40204: `lda_mailbox_autocreate` can bypass ACL restrictions (bsc#1276819). - CVE-2026-40205: OAuth2 `passdb` scope enforcement bypass via OR semantics in remote validation path (bsc#1276820). - CVE-2026-42007: `sieve` `editheader` RCE (bsc#1276817). - CVE-2026-42008: `XCLIENT FORWARD= bare` token not namespaced (bsc#1276824). - CVE-2026-42391: `imap`: pre-login memory/CPU growth with `ID` command (bsc#1276835). - CVE-2026-42392: `imap-urlauth` leaks memory into user-visible error messages (bsc#1276829). - CVE-2026-42393: `doveadm_password` or api key length can be leaked with timing comparisons (bsc#1276827). - CVE-2026-52687: `imap`: `COMPRESS ZSTD` can cause excessive memory usage (bsc#1276837). - CVE-2026-42395: single NUL-byte `XCLIENT FORWARD` payload crashes (bsc#1276826). - CVE-2026-52681: `sieve` resource usage tracking lost when active script changes (bsc#1276828). - CVE-2026-73208: `auth`: `db-oauth2`: `aud` claim used as fallback for missing scope claim (bsc#1276830). - CVE-2026-73209: `imap-login` crash due to self-recursion on zero-output decompress chunks (bsc#1276833).

GCVE source: db.gcve.eu
Csaf Category: csaf_security_advisory
Csaf Version: 2.0
Publisher: SUSE Product Security Team
Advisory ID: openSUSE-SU-2026:21720-1
Vendor Severity: critical
CVE Count: 24
Additional Cves: CVE-2026-33263, CVE-2026-33604, CVE-2026-33605, CVE-2026-33606, CVE-2026-33607, CVE-2026-40013, CVE-2026-40014, CVE-2026-40015, CVE-2026-40017, CVE-2026-40018, CVE-2026-40203, CVE-2026-40204, CVE-2026-40205, CVE-2026-42007, CVE-2026-42008, CVE-2026-42391, CVE-2026-42392, CVE-2026-42393, CVE-2026-42395, CVE-2026-52681, CVE-2026-52687, CVE-2026-73208, CVE-2026-73209

References

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