← Vulnerability feed

Vulnerability record · CVE-2026-27851 · published 12 May 2026

CVE-2026-27851: Dovecot sql injection vulnerability

Dovecot · Dovecot

When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on fixed version. No publicly available exploits are known.

9.1 CVSS 3.1 Critical EPSS 0.58% · top 54.7% CWE-235 · CWE-235CWE-89 · SQL injection
9.1CVSS 3.1 base score
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
15 Jul 2026Last modified by NVD

Description

When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabling unsafe data to be unescaped. This can enable SQL / LDAP injection attacks when used in authentication. Avoid using safe filter until on fixed version. No publicly available exploits are known.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0002.json Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-27851
https://bugzilla.redhat.com/show_bug.cgi?id=2476471
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27851.json

Track CVE-2026-27851 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-11500Dovecot IMAP quoted-string handling out-of-bounds writeDovecot before 2.2.36.4 and 2.3.x before 2.3.7.2 (and Pigeonhole before 0.5.7.2) mishandles '\0' characters during protocol processing of quoted stri…EPSS 63%analysed8.8CVE-2022-30550Dovecot improper authentication vulnerabilityAn issue was discovered in the auth component in Dovecot 2.2 and 2.3 before 2.3.20. When two passdb configuration entries exist with the same driver …EPSS 2.2%8.2CVE-2026-24031Dovecot sql injection vulnerabilityDovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin. This vulnerability allows bypassing authentication for…EPSS 0.40%7.8CVE-2019-7524Dovecot memory buffer overflow vulnerabilityIn Dovecot before 2.2.36.3 and 2.3.x before 2.3.5.1, a local attacker can cause a buffer overflow in the indexer-worker process, which can be used to…EPSS 1.2%7.5CVE-2026-27858Dovecot uncontrolled resource consumption vulnerabilityAttacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force…EPSS 1.0%7.5CVE-2026-27857Dovecot uncontrolled resource consumption vulnerabilitySending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer commands will result in client disconnec…EPSS 0.80%7.5CVE-2025-59028Dovecot improper input validation vulnerabilityWhen sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invali…EPSS 0.45%7.5CVE-2025-59032Dovecot improper input validation vulnerabilityManageSieve AUTHENTICATE command crashes when using literal as SASL initial response. This can be used to crash ManageSieve service repeatedly, makin…EPSS 0.70%

Source: NIST National Vulnerability Database (record CVE-2026-27851), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.