TI-2026-37810 Aliases CVE-2026-52681 GHSA-x4gp-83hc-j86g

Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid…

LOW 15CWE-1050Published 2026-08-28 · Updated 2026-08-28

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: None · None · Low
Fix status: Partial Red Hat: 3 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can reset the accounting by repeatedly changing the active script. Compiled script files are also not removed when a script is deleted or renamed. The configured Sieve CPU limit can be bypassed, allowing sustained CPU consumption, and the leftover files increase disk consumption. Both can cause degradation of service for mail delivery. Monitor system for abnormal CPU usage and disk consumption. Update to non-vulnerable version. No publicly available exploits are known.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00296 22nd percentileScored 2026-11-07

Fix Partial OX Dovecot Pro (Open-Xchange GmbH): 2.3.22.2, 3.0.7, 3.1.6OX Dovecot CE (Open-Xchange GmbH): 2.4.5Red Hat: 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Open-Xchange GmbH	OX Dovecot Pro	2.3.15 to before 2.3.22.2; 3.0.0 to before 3.0.7; 3.1.0 to before 3.1.6	2.3.22.2, 3.0.7, 3.1.6	Patch available	CNA
Open-Xchange GmbH	OX Dovecot CE	2.3.15 to before 2.4.5	2.4.5	Patch available	CNA

OX Dovecot Pro VendorOpen-Xchange GmbH Affected 2.3.15 to before 2.3.22.2; 3.0.0 to before 3.0.7; 3.1.0 to before 3.1.6 Fixed in 2.3.22.2, 3.0.7, 3.1.6 Patch available CNA
OX Dovecot CE VendorOpen-Xchange GmbH Affected 2.3.15 to before 2.4.5 Fixed in 2.4.5 Patch available CNA

Remediation

Fix · CNA OX Dovecot Pro (Open-Xchange GmbH) Fixed in 2.3.22.2, 3.0.7, 3.1.6
Fix · CNA OX Dovecot CE (Open-Xchange GmbH) Fixed in 2.4.5

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2026-08-28
Open-Xchange OX Dovecot CE, OX Dovecot Pro — documentation.open-xchange.com/dovecot/security/advisories/…
25 records Highest priority Priority LOW 25 LOW
Other records, highest priority first
- TI-2026-30691 Uncontrolled resource consumption in Open-Xchange GmbH OX Dovecot ProPriority LOW 39
- TI-2026-30395 Use after free in Open-Xchange GmbH OX Dovecot ProPriority LOW 39
- TI-2026-25987 Uncontrolled resource consumption in Open-Xchange GmbH OX Dovecot ProPriority LOW 39
Show all 25 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred

Not affected: 2 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7

Timeline

2026-10-02 Threatist record created from CVE-2026-52681
2026-10-03 Alias added: GHSA-x4gp-83hc-j86g

References

Advisory 1

https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json

TI-2024-04069 Improper check for unusual conditions in Mozilla Firefox CVSS 3.1HIGH 8.8
TI-2022-17394 OX App Suite through 7.10.6 allows SSRF because the anti-SSRF protection mechanism only… CVSS 3.1MEDIUM 5.3
TI-2022-17393 OX App Suite through 7.10.6 has Uncontrolled Resource Consumption via a large request… CVSS 3.1MEDIUM 5.3
TI-2022-17392 OX App Suite through 7.10.6 has Uncontrolled Resource Consumption via a large location… CVSS 3.1MEDIUM 5.3
TI-2022-17391 OX App Suite through 7.10.6 allows XSS via a malicious capability to the metrics or help… CVSS 3.1MEDIUM 6.1
TI-2022-17390 OX App Suite through 7.10.6 allows XSS via script code within a contact that has an e-mail address but lacks a name. CVSS 3.1MEDIUM 6.1

See all 317 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences