CVE-2026-73209: Uncontrolled Recursion in Open-Xchange GmbH OX Dovecot Pro
Description
CVE-2026-73209 is a vulnerability in Open-Xchange GmbH's OX Dovecot Pro where an attacker with valid credentials can send specially crafted compressed data causing uncontrolled recursion. This leads to stack exhaustion and termination of the affected process, resulting in denial of service for IMAP. No public exploits are known. The vulnerability has a medium severity rating with a CVSS score of 6.5.
CVSS v3.1
Score 6.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves uncontrolled recursion triggered by crafted compressed data sent by an authenticated attacker to OX Dovecot Pro. The recursion exhausts the stack, causing the affected process to crash and terminate, which can degrade or deny IMAP service availability. The flaw is identified as CWE-674 (Improper Control of a Resource Through its Lifetime). No exploits have been publicly reported. The affected versions explicitly include 2.3.0, 3.0.0, and 3.1.0. No patch or remediation details are provided in the source data.
Potential Impact
An attacker with valid credentials can cause the OX Dovecot Pro IMAP service process to crash by sending crafted compressed data, resulting in denial of service or service degradation. There is no impact on confidentiality or integrity according to the CVSS vector. The primary impact is availability disruption.
Mitigation Recommendations
The vendor advisory does not provide explicit patch or remediation information. Users should update to a non-vulnerable version when available. Until then, monitor for unusual IMAP service crashes and restrict access to trusted users. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-r5w4-jgmp-fp92
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-73209"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
Threat ID: 6a91a7b7acd9273b49064ff7
Added to database: 08/28/2026, 15:22:31 UTC
Last enriched: 09/10/2026, 02:23:45 UTC
Last updated: 10/13/2026, 06:48:19 UTC
Views: 41
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