openSUSE 16: dovecot24 / dovecot24-backend-mysql / dovecot24-backend-pgsql / etc (openSUSE-SU-2026:21720-1)

critical Nessus Plugin ID 342588

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Synopsis

The remote openSUSE host is missing one or more security updates.

Description

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21720-1 advisory.

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).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

Plugin Details

Severity: Critical

ID: 342588

File Name: openSUSE-2026-21720-1.nasl

Version: 1.1

Type: Local

Agent: unix

Family: SuSE Local Security Checks

Published: 9/3/2026

Updated: 9/3/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.48

CVSS v2

Risk Factor: High

Base Score: 8

Temporal Score: 5.9

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:C

CVSS Score Source: CVE-2026-42007

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:novell:opensuse:16.0, p-cpe:/a:novell:opensuse:dovecot24-backend-mysql, p-cpe:/a:novell:opensuse:dovecot24-backend-pgsql, p-cpe:/a:novell:opensuse:dovecot24-backend-sqlite, p-cpe:/a:novell:opensuse:dovecot24-devel, p-cpe:/a:novell:opensuse:dovecot24-fts-flatcurve, p-cpe:/a:novell:opensuse:dovecot24-fts-solr, p-cpe:/a:novell:opensuse:dovecot24-fts, p-cpe:/a:novell:opensuse:dovecot24

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/SuSE/release, Host/SuSE/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 9/1/2026

Vulnerability Publication Date: 8/28/2026

Reference Information

CVE: CVE-2026-27852, 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

Detections

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