- Issued:
- 2026-05-14
- Updated:
- 2026-05-14
RHSA-2026:17630 - Security Advisory
Synopsis
Important: dovecot security update
Type/Severity
Security Advisory: Important
Red Hat Lightspeed patch analysis
Identify and remediate systems affected by this advisory.
Topic
An update for dovecot is now available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Description
Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind. It also contains a small POP3 server, and supports e-mail in either the maildir or mbox format. The SQL drivers and authentication plug-ins are provided as subpackages.
Security Fix(es):
- dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command (CVE-2025-59032)
- dovecot: denial of service via crafted message before authentication (CVE-2026-27858)
- dovecot: denial of service via specially crafted NOOP command (CVE-2026-27857)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Solution
For details on how to apply this update, which includes the changes described in this advisory, refer to:
Affected Products
- Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.0 ppc64le
- Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.0 x86_64
- Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.0 aarch64
- Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.0 s390x
Fixes
- BZ - 2452172 - CVE-2025-59032 dovecot: ManageSieve: Denial of Service via crafted SASL initial response in AUTHENTICATE command
- BZ - 2452175 - CVE-2026-27858 dovecot: denial of service via crafted message before authentication
- BZ - 2452179 - CVE-2026-27857 dovecot: denial of service via specially crafted NOOP command
Note:
More recent versions of these packages may be available.
Click a package name for more details.
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.0
| SRPM | |
|---|---|
| dovecot-2.3.16-3.el9_0.1.src.rpm | SHA-256: 590cbff772d8810cf74c402545c377f9f6758b16a63ed909612c29a5f08c623d |
| ppc64le | |
| dovecot-2.3.16-3.el9_0.1.ppc64le.rpm | SHA-256: 69f08ed9f25c98673f90550453cf0c0223c6aa532d2589e8cbabec35ea4fbbbc |
| dovecot-debuginfo-2.3.16-3.el9_0.1.ppc64le.rpm | SHA-256: 1701026580996efc4fb68770fc5f00c9c461a63f82db22c67fe4a449d257f950 |
| dovecot-debugsource-2.3.16-3.el9_0.1.ppc64le.rpm | SHA-256: 4a34401fbc9390d809aeb7dd0ebbe8267aea169a247787c0866140923d19eaee |
| dovecot-mysql-2.3.16-3.el9_0.1.ppc64le.rpm | SHA-256: 9fc723cd77cb6d32d1a2493684616fad0308e64136c24d8edec84e854ca48dce |
| dovecot-mysql-debuginfo-2.3.16-3.el9_0.1.ppc64le.rpm | SHA-256: 9f9e3602f3769ecc0f4ad5c9f0e0cb21b8dc62502d05e46f5974253a8842049f |
| dovecot-pgsql-2.3.16-3.el9_0.1.ppc64le.rpm | SHA-256: 1d55d9bf6bb012bdac28ba79f3e94c9ac8ad1e8fbd23a645ba988536f4d4818e |
| dovecot-pgsql-debuginfo-2.3.16-3.el9_0.1.ppc64le.rpm | SHA-256: 61a7cc10d3a10c096a5740608e8eb5f5744993d5f1568ea04a11ace8b05c50a9 |
| dovecot-pigeonhole-2.3.16-3.el9_0.1.ppc64le.rpm | SHA-256: 1ba0ea5b0ad4d6ccfc8dda38b16e19d8135ec70b62e5c3b84ab410bad8608601 |
| dovecot-pigeonhole-debuginfo-2.3.16-3.el9_0.1.ppc64le.rpm | SHA-256: cc57765f81356e2ee8cfea4452ffc3ce6a6a323f3484fbe19d6b38c353167389 |
Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.0
| SRPM | |
|---|---|
| dovecot-2.3.16-3.el9_0.1.src.rpm | SHA-256: 590cbff772d8810cf74c402545c377f9f6758b16a63ed909612c29a5f08c623d |
| x86_64 | |
| dovecot-2.3.16-3.el9_0.1.x86_64.rpm | SHA-256: e9c14d5bc849768fcbe6f2eb898e2c5ed1fea347287682a4bb0c5533f2c50c88 |
| dovecot-debuginfo-2.3.16-3.el9_0.1.x86_64.rpm | SHA-256: d7a41e9a68f104098ada29b852d7f3fe464ffa759a38bb6f39ae716aa6b43509 |
| dovecot-debugsource-2.3.16-3.el9_0.1.x86_64.rpm | SHA-256: 4169a2a5da0ad6da0182600e7ac9702eb9b20f6908f4f24919348fc3652088ee |
| dovecot-mysql-2.3.16-3.el9_0.1.x86_64.rpm | SHA-256: 2ceaccd537af5d653b28462c36f58b412d448430d300f78d6c4ea5757229116b |
| dovecot-mysql-debuginfo-2.3.16-3.el9_0.1.x86_64.rpm | SHA-256: 5ad14dad76ac7199b3e8d6b9dd5c73ca3ca4d360ba797f994445a7756c9aa154 |
| dovecot-pgsql-2.3.16-3.el9_0.1.x86_64.rpm | SHA-256: d41b5e10086502e35d027c1387b3dab0b71716a0b9b33171839a15180fbe0038 |
| dovecot-pgsql-debuginfo-2.3.16-3.el9_0.1.x86_64.rpm | SHA-256: 18bdc8efe82d3d21357da7a52848a6b899302e975cd8bdf3cbff900b28f455dc |
| dovecot-pigeonhole-2.3.16-3.el9_0.1.x86_64.rpm | SHA-256: 7cf0c78269f63b2cbe7bfc317840f2f0168601c829565d1a2a95ea6ad6be1f31 |
| dovecot-pigeonhole-debuginfo-2.3.16-3.el9_0.1.x86_64.rpm | SHA-256: deaf088c157392e5ad9ae2ea7faaf2967f7eca733af543e1591085dfd4cf081e |
Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.0
| SRPM | |
|---|---|
| dovecot-2.3.16-3.el9_0.1.src.rpm | SHA-256: 590cbff772d8810cf74c402545c377f9f6758b16a63ed909612c29a5f08c623d |
| aarch64 | |
| dovecot-2.3.16-3.el9_0.1.aarch64.rpm | SHA-256: bbf322287aeceecab55eb2b0e2ab2fa8224536b68d6e9289776b0248f9a5c374 |
| dovecot-debuginfo-2.3.16-3.el9_0.1.aarch64.rpm | SHA-256: 7adc3d2aed00048aecfcfb0932346853bfde6b99c1f6849027a32bf9ddf613a4 |
| dovecot-debugsource-2.3.16-3.el9_0.1.aarch64.rpm | SHA-256: cb069734ba557c1ad3ded7475346920aa15b9316ed04ecc6bfafa8a9658d388e |
| dovecot-mysql-2.3.16-3.el9_0.1.aarch64.rpm | SHA-256: 09c2584b7fc62f1bcbe1b818e553f210f82d61af55e50734008b91b2020be00e |
| dovecot-mysql-debuginfo-2.3.16-3.el9_0.1.aarch64.rpm | SHA-256: 52fac807b7cf5951e4c7c47a478dc600d64278e6373dc76e00864fc9a02b72f5 |
| dovecot-pgsql-2.3.16-3.el9_0.1.aarch64.rpm | SHA-256: fa2a9e449575f07ba05157152d468bc58140b628ef45801c27881ad465b959f3 |
| dovecot-pgsql-debuginfo-2.3.16-3.el9_0.1.aarch64.rpm | SHA-256: d7ea54ea9897978a357faa39159598fa57c9699218cfe67c2b8508a320ea8aa9 |
| dovecot-pigeonhole-2.3.16-3.el9_0.1.aarch64.rpm | SHA-256: 8e8e4740fb14899f737ce786162d9d0fbb605a039b0d4a17b488642a3309cbc9 |
| dovecot-pigeonhole-debuginfo-2.3.16-3.el9_0.1.aarch64.rpm | SHA-256: 2df9653583ad33394a22d0150ed3e88293a05c989133cb1c825dbdd8b919772a |
Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.0
| SRPM | |
|---|---|
| dovecot-2.3.16-3.el9_0.1.src.rpm | SHA-256: 590cbff772d8810cf74c402545c377f9f6758b16a63ed909612c29a5f08c623d |
| s390x | |
| dovecot-2.3.16-3.el9_0.1.s390x.rpm | SHA-256: a558a8edf21d175da18c0d813d2dfe07087094337310e6aeee74c8d7dbf42d2a |
| dovecot-debuginfo-2.3.16-3.el9_0.1.s390x.rpm | SHA-256: 7f45b8249334d0748822e2012d9512338c56e91b91b25a9b1698c9d8ecddf699 |
| dovecot-debugsource-2.3.16-3.el9_0.1.s390x.rpm | SHA-256: 400a97f0c48bf3064fa51781afc0849ecf0d3edcb8d22e789680b2716bf55f6c |
| dovecot-mysql-2.3.16-3.el9_0.1.s390x.rpm | SHA-256: 147d9d38af6f4b7a5e8320ff9c98cced08dd3f55f0c2868d1f17115beb6a7cea |
| dovecot-mysql-debuginfo-2.3.16-3.el9_0.1.s390x.rpm | SHA-256: 359a16b240f4f9d87f9b9d358617520e0a8d5074439223afbf050e43af158d12 |
| dovecot-pgsql-2.3.16-3.el9_0.1.s390x.rpm | SHA-256: 7c7c4bb775f3e8d9c113b2abaf3a828743b658789df18af1c3d90749f2cf09e5 |
| dovecot-pgsql-debuginfo-2.3.16-3.el9_0.1.s390x.rpm | SHA-256: ec1058d2e37075c2c0560c3e74061d668ecca0c7b72dd0e228c55d8bcc5921d0 |
| dovecot-pigeonhole-2.3.16-3.el9_0.1.s390x.rpm | SHA-256: 27e9220ce594a5bf8e2707a73c6b144168f5f88b06dbe1efddb1f1e24d930aaa |
| dovecot-pigeonhole-debuginfo-2.3.16-3.el9_0.1.s390x.rpm | SHA-256: 3dc9275074811cecbc72356be31eea1c3f5df07041497ffbcf2ea6dcd7c5ba7e |
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