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Fencer Intel
high 7.4

CVE-2026-27851 json

When safe filter is used with variable expansion, all following pipelines on the same string are incorrectly interpreted as safe too, enabl…

published 5mo ago modified 14d ago also EUVD-2026-29467

cvss
7.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 35%
public exploits
0
none known

Summary

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.

Patch / fix

  • dovecot dovecot 2.4.4, 3.1.5
  • open-xchange dovecot 2.4.4, 3.1.5
  • dovecot Debian 13 1:2.4.1+dfsg1-6+deb13u6
  • dovecot Debian 14 1:2.4.4+dfsg1-1

debian advisories DEBIAN-CVE-2026-27851

  • dovecot Ubuntu 25.10 1:2.4.1+dfsg1-5ubuntu4.2
  • dovecot Ubuntu 26.04 LTS 1:2.4.2+dfsg1-3ubuntu2.1

ubuntu advisories UBUNTU-CVE-2026-27851

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dovecot24 SLES for SAP applications 16.0, SLES 16.0 2.4.4-160000.1.1

suse advisories SUSE-SU-2026:22185-1

  • dovecot24 openSUSE Leap 16.0 2.4.4-160000.1.1
  • dovecot24 openSUSE Tumbleweed 2.4.4-1.1

opensuse advisories openSUSE-SU-2026:21109-1openSUSE-SU-2026:10766-1

  • dovecot Alpine 3.24, Alpine 3.23 2.4.4-r0

alpine advisories ALPINE-CVE-2026-27851

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2026-27851 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-27851 updated cvss 7.4

dovecot: Dovecot: SQL/LDAP injection via incorrect safe filter interpretation with variable expansion

  • Red Hat Enterprise Linux 6 dovecot, dovecot-mysql, dovecot-pgsql, dovecot-pigeonhole
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 dovecot, dovecot-mysql, dovecot-pgsql, dovecot-pigeonhole Red Hat Enterprise Linux 9 dovecot, dovecot-mysql, dovecot-pgsql, dovecot-pigeonhole Red Hat Enterprise Linux 10 dovecot
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5mo ago

Exploit prediction

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA ADP 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

  • Open-Xchange GmbH OX Dovecot Pro
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9

Classification

Weakness
  • CWE-235 Improper Handling of Extra Parameters
  • CWE-89 Improper Neutralization of Special Elements used in an SQL Command

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.