CVE-2026-42006
EUVD-2026-2947312.05.2026, 14:17
An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass the limit. Using excessive bracing, attacker can cause memory usage up to configured memory limit. Install fixed version, or configure vsz_limit for imap process to low value. No publicly available exploits are known.Enginsight
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| dovecot | dovecot | 𝑥 < 2.4.4 |
| open-xchange | dovecot | 𝑥 < 3.1.5 |
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | 1:2.3.21-19.el10_2.1 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | 1:2.3.21-16.el10_0.2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | 1:2.2.36-8.el7_9.2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 8 | 1:2.3.16-8.el8_10 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | 1:2.3.8-9.el8_4.2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | 1:2.3.8-9.el8_4.2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | 1:2.3.16-2.el8_6.2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On | 1:2.3.16-2.el8_6.2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | 1:2.3.16-3.el8_8.2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | 1:2.3.16-3.el8_8.2 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 9 | 1:2.3.16-18.el9_8.1 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | 1:2.3.16-8.el9_2.3 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions | 1:2.3.16-11.el9_4.3 ≤ 𝑥 < * | ADP |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | 1:2.3.16-15.el9_6.2 ≤ 𝑥 < * | ADP |
Debian Releases
Debian Product | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| dovecot |
|
Ubuntu Releases
openSUSE / SLES Releases
openSUSE Product | |||||
|---|---|---|---|---|---|
| dovecot22 |
| ||||
| dovecot22-backend-mysql |
| ||||
| dovecot22-backend-pgsql |
| ||||
| dovecot22-backend-sqlite |
| ||||
| dovecot22-devel |
|
Red Hat Enterprise Linux Releases
Red Hat Product | |||||
|---|---|---|---|---|---|
| dovecot |
| ||||
| dovecot-devel |
| ||||
| dovecot-mysql |
| ||||
| dovecot-pgsql |
| ||||
| dovecot-pigeonhole |
|
Common Weakness Enumeration
- CWE-400 - Uncontrolled Resource ConsumptionThe software does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.
- CWE-770 - Allocation of Resources Without Limits or ThrottlingThe software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.